1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142
#![deny( missing_copy_implementations, missing_debug_implementations, missing_docs, trivial_casts, trivial_numeric_casts, unused_extern_crates, unused_import_braces, unused_qualifications, variant_size_differences )] #![warn(rust_2018_idioms)] #![doc(test(attr(deny( missing_copy_implementations, missing_debug_implementations, trivial_casts, trivial_numeric_casts, unused_extern_crates, unused_import_braces, unused_qualifications, variant_size_differences, ))))] #![doc(test(attr(warn(rust_2018_idioms))))] // Not needed for 2018 edition and conflicts with `rust_2018_idioms` #![doc(test(no_crate_inject))] #![doc(html_root_url = "https://docs.rs/serde_with/1.5.0")] // Rust 1.45: introduction of `strip_prefix` used by clippy::manual_strip #![allow(clippy::unknown_clippy_lints)] //! [](https://docs.rs/serde_with/) //! [](https://crates.io/crates/serde_with/) //! [](https://github.com/jonasbb/serde_with) //! [](https://codecov.io/gh/jonasbb/serde_with) //! //! --- //! //! This crate provides custom de/serialization helpers to use in combination with [serde's with-annotation][with-annotation] and with the improved [`serde_as`][user guide]-annotation. //! Some common use cases are: //! //! * De/Serializing a type using the `Display` and `FromStr` traits, e.g., for `u8`, `url::Url`, or `mime::Mime`. //! Check [`DisplayFromStr`][] or [`serde_with::rust::display_fromstr`][display_fromstr] for details. //! * Skip serializing all empty `Option` types with [`#[skip_serializing_none]`][skip_serializing_none]. //! * Apply a prefix to each field name of a struct, without changing the de/serialize implementations of the struct using [`with_prefix!`][]. //! * Deserialize a comma separated list like `#hash,#tags,#are,#great` into a `Vec<String>`. //! Check the documentation for [`serde_with::rust::StringWithSeparator::<CommaSeparator>`][StringWithSeparator]. //! //! Check out the [**user guide**][user guide] to find out more tips and tricks about this crate. //! //! # Use `serde_with` in your Project //! //! Add this to your `Cargo.toml`: //! //! ```toml //! [dependencies.serde_with] //! version = "1.5.0" //! features = [ "..." ] //! ``` //! //! The crate contains different features for integration with other common crates. //! Check the [feature flags][] section for information about all available features. //! //! # Examples //! //! Annotate your struct or enum to enable the custom de/serializer. //! //! ## `DisplayFromStr` //! //! ```rust //! # #[cfg(feature = "macros")] //! # use serde_derive::{Deserialize, Serialize}; //! # #[cfg(feature = "macros")] //! # use serde_with::{serde_as, DisplayFromStr}; //! # #[cfg(feature = "macros")] //! #[serde_as] //! # #[derive(Debug, Eq, PartialEq)] //! #[derive(Deserialize, Serialize)] //! struct Foo { //! // Serialize with Display, deserialize with FromStr //! #[serde_as(as = "DisplayFromStr")] //! bar: u8, //! } //! //! # #[cfg(all(feature = "macros", feature = "json"))] { //! // This will serialize //! # let foo = //! Foo {bar: 12} //! # ; //! //! // into this JSON //! # let json = r#" //! {"bar": "12"} //! # "#; //! # assert_eq!(json.replace(" ", "").replace("\n", ""), serde_json::to_string(&foo).unwrap()); //! # assert_eq!(foo, serde_json::from_str(&json).unwrap()); //! # } //! ``` //! //! ## `skip_serializing_none` //! //! This situation often occurs with JSON, but other formats also support optional fields. //! If many fields are optional, putting the annotations on the structs can become tedious. //! //! ```rust //! # #[cfg(feature = "macros")] //! # use serde_derive::{Deserialize, Serialize}; //! # #[cfg(feature = "macros")] //! # use serde_with::skip_serializing_none; //! # #[cfg(feature = "macros")] //! #[skip_serializing_none] //! # #[derive(Debug, Eq, PartialEq)] //! #[derive(Deserialize, Serialize)] //! struct Foo { //! a: Option<usize>, //! b: Option<usize>, //! c: Option<usize>, //! d: Option<usize>, //! e: Option<usize>, //! f: Option<usize>, //! g: Option<usize>, //! } //! //! # #[cfg(all(feature = "macros", feature = "json"))] { //! // This will serialize //! # let foo = //! Foo {a: None, b: None, c: None, d: Some(4), e: None, f: None, g: Some(7)} //! # ; //! //! // into this JSON //! # let json = r#" //! {"d": 4, "g": 7} //! # "#; //! # assert_eq!(json.replace(" ", "").replace("\n", ""), serde_json::to_string(&foo).unwrap()); //! # assert_eq!(foo, serde_json::from_str(&json).unwrap()); //! # } //! ``` //! //! ## Advanced `serde_as` usage //! //! This example is mainly supposed to highlight the flexibility of the `serde_as`-annotation compared to [serde's with-annotation][with-annotation]. //! More details about `serde_as` can be found in the [user guide][]. //! //! ```rust //! # #[cfg(all(feature = "macros", feature = "hex"))] //! # use { //! # serde_derive::{Deserialize, Serialize}, //! # serde_with::{serde_as, DisplayFromStr, DurationSeconds, hex::Hex}, //! # std::time::Duration, //! # std::collections::BTreeMap, //! # }; //! # #[cfg(all(feature = "macros", feature = "hex"))] //! #[serde_as] //! # #[derive(Debug, Eq, PartialEq)] //! #[derive(Deserialize, Serialize)] //! struct Foo { //! // Serialize them into a list of number as seconds //! #[serde_as(as = "Vec<DurationSeconds>")] //! durations: Vec<Duration>, //! // We can treat a Vec like a map with duplicates. //! // JSON only allows string keys, so convert i32 to strings //! // The bytes will be hex encoded //! #[serde_as(as = "BTreeMap<DisplayFromStr, Hex>")] //! bytes: Vec<(i32, Vec<u8>)>, //! } //! //! # #[cfg(all(feature = "macros", feature = "json", feature = "hex"))] { //! // This will serialize //! # let foo = //! Foo { //! durations: vec![Duration::new(5, 0), Duration::new(3600, 0), Duration::new(0, 0)], //! bytes: vec![ //! (1, vec![0, 1, 2]), //! (-100, vec![100, 200, 255]), //! (1, vec![0, 111, 222]), //! ], //! } //! # ; //! //! // into this JSON //! # let json = r#" //! { //! "durations": [5, 3600, 0], //! "bytes": { //! "1": "000102", //! "-100": "64c8ff", //! "1": "006fde" //! } //! } //! # "#; //! # assert_eq!(json.replace(" ", "").replace("\n", ""), serde_json::to_string(&foo).unwrap()); //! # assert_eq!(foo, serde_json::from_str(&json).unwrap()); //! # } //! ``` //! //! [`DisplayFromStr`]: https://docs.rs/serde_with/1.5.0/serde_with/struct.DisplayFromStr.html //! [`with_prefix!`]: https://docs.rs/serde_with/1.5.0/serde_with/macro.with_prefix.html //! [display_fromstr]: https://docs.rs/serde_with/1.5.0/serde_with/rust/display_fromstr/index.html //! [feature flags]: https://docs.rs/serde_with/1.5.0/serde_with/guide/feature_flags/index.html //! [skip_serializing_none]: https://docs.rs/serde_with/1.5.0/serde_with/attr.skip_serializing_none.html //! [StringWithSeparator]: https://docs.rs/serde_with/1.5.0/serde_with/rust/struct.StringWithSeparator.html //! [user guide]: https://docs.rs/serde_with/1.5.0/serde_with/guide/index.html //! [with-annotation]: https://serde.rs/field-attrs.html#with #[doc(hidden)] pub extern crate serde; #[cfg(feature = "chrono")] pub mod chrono; pub mod de; mod duplicate_key_impls; mod flatten_maybe; pub mod formats; #[cfg(feature = "hex")] pub mod hex; #[cfg(feature = "json")] pub mod json; pub mod rust; pub mod ser; mod utils; #[doc(hidden)] pub mod with_prefix; // Taken from shepmaster/snafu // Originally licensed as MIT+Apache 2 // https://github.com/shepmaster/snafu/blob/fd37d79d4531ed1d3eebffad0d658928eb860cfe/src/lib.rs#L121-L165 #[cfg(feature = "guide")] macro_rules! generate_guide { (pub mod $name:ident; $($rest:tt)*) => { generate_guide!(@gen ".", pub mod $name { } $($rest)*); }; (pub mod $name:ident { $($children:tt)* } $($rest:tt)*) => { generate_guide!(@gen ".", pub mod $name { $($children)* } $($rest)*); }; (@gen $prefix:expr, ) => {}; (@gen $prefix:expr, pub mod $name:ident; $($rest:tt)*) => { generate_guide!(@gen $prefix, pub mod $name { } $($rest)*); }; (@gen $prefix:expr, @code pub mod $name:ident; $($rest:tt)*) => { pub mod $name; generate_guide!(@gen $prefix, $($rest)*); }; (@gen $prefix:expr, pub mod $name:ident { $($children:tt)* } $($rest:tt)*) => { doc_comment::doc_comment! { include_str!(concat!($prefix, "/", stringify!($name), ".md")), pub mod $name { generate_guide!(@gen concat!($prefix, "/", stringify!($name)), $($children)*); } } generate_guide!(@gen $prefix, $($rest)*); }; } #[cfg(feature = "guide")] generate_guide! { pub mod guide { pub mod feature_flags; pub mod serde_as; } } #[doc(inline)] pub use crate::{de::DeserializeAs, rust::StringWithSeparator, ser::SerializeAs}; use serde::{Deserialize, Deserializer, Serialize, Serializer}; // Re-Export all proc_macros, as these should be seen as part of the serde_with crate #[cfg(feature = "macros")] #[doc(inline)] pub use serde_with_macros::*; use std::marker::PhantomData; /// Separator for string-based collection de/serialization pub trait Separator { /// Return the string delimiting two elements in the string-based collection fn separator() -> &'static str; } /// Predefined separator using a single space #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug, Default)] pub struct SpaceSeparator; impl Separator for SpaceSeparator { #[inline] fn separator() -> &'static str { " " } } /// Predefined separator using a single comma #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug, Default)] pub struct CommaSeparator; impl Separator for CommaSeparator { #[inline] fn separator() -> &'static str { "," } } /// Adapter to convert from `serde_as` to the serde traits. /// /// The `As` type adapter allows to use types implementing [`DeserializeAs`][] or [`SerializeAs`][] in place of serde's with-annotation. /// The with-annotation allows to run custom code when de/serializing, however it is quite inflexible. /// The traits [`DeserializeAs`][]/[`SerializeAs`][] are more flexible, as they allow composition and nesting of types to create more complex de/serialization behavior. /// However, they are not directly compatible with serde, as they are not provided by serde. /// The `As` type adapter makes them compatible, by forwarding the function calls to `serialize`/`deserialize` to the corresponding functions `serialize_as` and `deserialize_as`. /// /// It is not required to use this type directly. /// Instead, it is highly encouraged to use the [`#[serde_as]`][serde_as] attribute since it includes further usability improvements. /// If the use of the use of the proc-macro is not acceptable, then `As` can be used directly with serde. /// /// ```rust /// # use serde_derive::{Deserialize, Serialize}; /// # use serde_with::{As, DisplayFromStr}; /// # /// #[derive(Deserialize, Serialize)] /// # struct S { /// // Serialize numbers as sequence of strings, using Display and FromStr /// #[serde(with = "As::<Vec<DisplayFromStr>>")] /// field: Vec<u8>, /// # } /// ``` /// If the normal `Deserialize`/`Serialize` traits should be used, the placeholder type [`Same`] can be used. /// It implements [`DeserializeAs`][]/[`SerializeAs`][], when the underlying type implements `Deserialize`/`Serialize`. /// /// ```rust /// # use serde_derive::{Deserialize, Serialize}; /// # use serde_with::{As, DisplayFromStr, Same}; /// # use std::collections::BTreeMap; /// # /// #[derive(Deserialize, Serialize)] /// # struct S { /// // Serialize map, turn keys into strings but keep type of value /// #[serde(with = "As::<BTreeMap<DisplayFromStr, Same>>")] /// field: BTreeMap<u8, i32>, /// # } /// ``` /// /// [serde_as]: https://docs.rs/serde_with/1.5.0/serde_with/attr.serde_as.html #[derive(Copy, Clone, Debug, Default)] pub struct As<T>(PhantomData<T>); impl<T> As<T> { /// Serialize type `T` using [`SerializeAs`][] /// /// The function signature is compatible with [serde's with-annotation][with-annotation]. /// /// [with-annotation]: https://serde.rs/field-attrs.html#with pub fn serialize<S, I>(value: &I, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer, T: SerializeAs<I>, { T::serialize_as(value, serializer) } /// Deserialize type `T` using [`DeserializeAs`][] /// /// The function signature is compatible with [serde's with-annotation][with-annotation]. /// /// [with-annotation]: https://serde.rs/field-attrs.html#with pub fn deserialize<'de, D, I>(deserializer: D) -> Result<I, D::Error> where T: DeserializeAs<'de, I>, D: Deserializer<'de>, { T::deserialize_as(deserializer) } } /// Adapter to convert from `serde_as` to the serde traits. /// /// This is the counter-type to [`As`][]. /// It can be used whenever a type implementing [`DeserializeAs`][]/[`SerializeAs`][] is required but the normal `Deserialize`/`Serialize` traits should be used. /// Check [`As`] for an example. #[derive(Copy, Clone, Debug, Default)] pub struct Same; /// De/Serialize using [`Display`] and [`FromStr`] implementation /// /// This allows to deserialize a string as a number. /// It can be very useful for serialization formats like JSON, which do not support integer /// numbers and have to resort to strings to represent them. /// /// Another use case is types with [`Display`] and [`FromStr`] implementations, but without serde /// support, which can be found in some crates. /// /// If you control the type you want to de/serialize, you can instead use the two derive macros, [`SerializeDisplay`] and [`DeserializeFromStr`]. /// They properly implement the traits [`Serialize`] and [`Deserialize`] such that user of the type no longer have to use the `serde_as` system. /// /// The same functionality is also available as [`serde_with::rust::display_fromstr`][crate::rust::display_fromstr] compatible with serde's with-annotation. /// /// # Examples /// /// ```rust /// # #[cfg(feature = "macros")] { /// # use serde_derive::{Deserialize, Serialize}; /// # use serde_json::json; /// # use serde_with::{serde_as, DisplayFromStr}; /// # /// #[serde_as] /// #[derive(Deserialize, Serialize)] /// struct A { /// #[serde_as(as = "DisplayFromStr")] /// mime: mime::Mime, /// #[serde_as(as = "DisplayFromStr")] /// number: u32, /// } /// /// let v: A = serde_json::from_value(json!({ /// "mime": "text/plain", /// "number": "159", /// })).unwrap(); /// assert_eq!(mime::TEXT_PLAIN, v.mime); /// assert_eq!(159, v.number); /// /// let x = A { /// mime: mime::STAR_STAR, /// number: 777, /// }; /// assert_eq!(json!({ "mime": "*/*", "number": "777" }), serde_json::to_value(&x).unwrap()); /// # } /// ``` /// /// [`Display`]: std::fmt::Display /// [`FromStr`]: std::str::FromStr #[derive(Copy, Clone, Debug, Default)] pub struct DisplayFromStr; /// De/Serialize a [`Option`]`<`[`String`]`>` type while transforming the empty string to [`None`] /// /// Convert an [`Option`]`<T>` from/to string using [`FromStr`] and [`AsRef`]`<`[`str`]`>` implementations. /// An empty string is deserialized as [`None`] and a [`None`] vice versa. /// /// The same functionality is also available as [`serde_with::rust::string_empty_as_none`][crate::rust::string_empty_as_none] compatible with serde's with-annotation. /// /// # Examples /// /// ``` /// # #[cfg(feature = "macros")] { /// # use serde_derive::{Deserialize, Serialize}; /// # use serde_json::json; /// # use serde_with::{serde_as, NoneAsEmptyString}; /// # /// #[serde_as] /// #[derive(Deserialize, Serialize)] /// struct A { /// #[serde_as(as = "NoneAsEmptyString")] /// tags: Option<String>, /// } /// /// let v: A = serde_json::from_value(json!({ "tags": "" })).unwrap(); /// assert_eq!(None, v.tags); /// /// let v: A = serde_json::from_value(json!({ "tags": "Hi" })).unwrap(); /// assert_eq!(Some("Hi".to_string()), v.tags); /// /// let x = A { /// tags: Some("This is text".to_string()), /// }; /// assert_eq!(json!({ "tags": "This is text" }), serde_json::to_value(&x).unwrap()); /// /// let x = A { /// tags: None, /// }; /// assert_eq!(json!({ "tags": "" }), serde_json::to_value(&x).unwrap()); /// # } /// ``` /// /// [`FromStr`]: std::str::FromStr #[derive(Copy, Clone, Debug, Default)] pub struct NoneAsEmptyString; /// Deserialize value and return [`Default`] on error /// /// The main use case is ignoring error while deserializing. /// Instead of erroring, it simply deserializes the [`Default`] variant of the type. /// It is not possible to find the error location, i.e., which field had a deserialization error, with this method. /// /// The same functionality is also available as [`serde_with::rust::default_on_error`][crate::rust::default_on_error] compatible with serde's with-annotation. /// /// # Examples /// /// ``` /// # #[cfg(feature = "macros")] { /// # use serde_derive::Deserialize; /// # use serde_with::{serde_as, DefaultOnError}; /// # /// #[serde_as] /// #[derive(Deserialize, Debug)] /// struct A { /// #[serde_as(deserialize_as = "DefaultOnError")] /// value: u32, /// } /// /// let a: A = serde_json::from_str(r#"{"value": 123}"#).unwrap(); /// assert_eq!(123, a.value); /// /// // null is of invalid type /// let a: A = serde_json::from_str(r#"{"value": null}"#).unwrap(); /// assert_eq!(0, a.value); /// /// // String is of invalid type /// let a: A = serde_json::from_str(r#"{"value": "123"}"#).unwrap(); /// assert_eq!(0, a.value); /// /// // Map is of invalid type /// let a: A = dbg!(serde_json::from_str(r#"{"value": {}}"#)).unwrap(); /// assert_eq!(0, a.value); /// /// // Missing entries still cause errors /// assert!(serde_json::from_str::<A>(r#"{ }"#).is_err()); /// # } /// ``` /// /// Deserializing missing values can be supported by adding the `default` field attribute: /// /// ``` /// # #[cfg(feature = "macros")] { /// # use serde_derive::Deserialize; /// # use serde_with::{serde_as, DefaultOnError}; /// # /// #[serde_as] /// #[derive(Deserialize)] /// struct B { /// #[serde_as(deserialize_as = "DefaultOnError")] /// #[serde(default)] /// value: u32, /// } /// /// /// let b: B = serde_json::from_str(r#"{ }"#).unwrap(); /// assert_eq!(0, b.value); /// # } /// ``` /// /// `DefaultOnError` can be combined with other conversion methods. /// In this example we deserialize a `Vec`, each element is deserialized from a string. /// If the string does not parse as a number, then we get the default value of 0. /// /// ```rust /// # #[cfg(feature = "macros")] { /// # use serde_derive::{Deserialize, Serialize}; /// # use serde_json::json; /// # use serde_with::{serde_as, DefaultOnError, DisplayFromStr}; /// # /// #[serde_as] /// #[derive(Serialize, Deserialize)] /// struct C { /// #[serde_as(as = "Vec<DefaultOnError<DisplayFromStr>>")] /// value: Vec<u32>, /// }; /// /// let c: C = serde_json::from_value(json!({ /// "value": ["1", "2", "a3", "", {}, "6"] /// })).unwrap(); /// assert_eq!(vec![1, 2, 0, 0, 0, 6], c.value); /// # } /// ``` #[derive(Copy, Clone, Debug, Default)] pub struct DefaultOnError<T = Same>(PhantomData<T>); /// Deserialize from bytes or string /// /// Any Rust [`String`] can be converted into bytes, i.e., `Vec<u8>`. /// Accepting both as formats while deserializing can be helpful while interacting with language /// which have a looser definition of string than Rust. /// /// # Example /// ```rust /// # #[cfg(feature = "macros")] { /// # use serde_derive::{Deserialize, Serialize}; /// # use serde_json::json; /// # use serde_with::{serde_as, BytesOrString}; /// # /// #[serde_as] /// #[derive(Deserialize, Serialize)] /// struct A { /// #[serde_as(as = "BytesOrString")] /// bytes_or_string: Vec<u8>, /// } /// /// // Here we deserialize from a byte array ... /// let j = json!({ /// "bytes_or_string": [ /// 0, /// 1, /// 2, /// 3 /// ] /// }); /// /// let a: A = serde_json::from_value(j.clone()).unwrap(); /// assert_eq!(vec![0, 1, 2, 3], a.bytes_or_string); /// /// // and serialization works too. /// assert_eq!(j, serde_json::to_value(&a).unwrap()); /// /// // But we also support deserializing from a String /// let j = json!({ /// "bytes_or_string": "✨Works!" /// }); /// /// let a: A = serde_json::from_value(j).unwrap(); /// assert_eq!("✨Works!".as_bytes(), &*a.bytes_or_string); /// # } /// ``` #[derive(Copy, Clone, Debug, Default)] pub struct BytesOrString; /// De/Serialize Durations as number of seconds. /// /// De/serialize durations as number of seconds with subsecond precision. /// Subsecond precision is *only* supported for [`DurationSecondsWithFrac`], but not for [`DurationSeconds`]. /// You can configure the serialization format between integers, floats, and stringified numbers with the `FORMAT` specifier and configure the deserialization with the `STRICTNESS` specifier. /// /// The `STRICTNESS` specifier can either be [`formats::Strict`] or [`formats::Flexible`] and defaults to [`formats::Strict`]. /// [`formats::Strict`] means that deserialization only supports the type given in `FORMAT`, e.g., if `FORMAT` is `u64` deserialization from a `f64` will error. /// [`formats::Flexible`] means that deserialization will perform a best effort to extract the correct duration and allows deserialization from any type. /// For example, deserializing `DurationSeconds<f64, Flexible>` will discard any subsecond precision during deserialization from `f64` and will parse a `String` as an integer number. /// /// This type also supports `chrono::Duration` with the `chrono`-[feature flag]. /// /// | Duration Type | Converter | Available `FORMAT`s | /// | --------------------- | ------------------------- | ---------------------- | /// | `std::time::Duration` | `DurationSeconds` | `u64`, `f64`, `String` | /// | `std::time::Duration` | `DurationSecondsWithFrac` | `f64`, `String` | /// | `chrono::Duration` | `DurationSeconds` | `i64`, `f64`, `String` | /// | `chrono::Duration` | `DurationSecondsWithFrac` | `f64`, `String` | /// /// # Examples /// /// ```rust /// # #[cfg(feature = "macros")] { /// # use serde_derive::{Deserialize, Serialize}; /// # use serde_json::json; /// # use serde_with::{serde_as, DurationSeconds}; /// use std::time::Duration; /// /// #[serde_as] /// # #[derive(Debug, PartialEq)] /// #[derive(Deserialize, Serialize)] /// struct Durations { /// #[serde_as(as = "DurationSeconds<u64>")] /// d_u64: Duration, /// #[serde_as(as = "DurationSeconds<f64>")] /// d_f64: Duration, /// #[serde_as(as = "DurationSeconds<String>")] /// d_string: Duration, /// }; /// /// // Serialization /// // See how the values get rounded, since subsecond precision is not allowed. /// /// let d = Durations { /// d_u64: Duration::new(12345, 0), // Create from seconds and nanoseconds /// d_f64: Duration::new(12345, 500_000_000), /// d_string: Duration::new(12345, 999_999_999), /// }; /// // Observe the different datatypes /// let expected = json!({ /// "d_u64": 12345, /// "d_f64": 12346.0, /// "d_string": "12346", /// }); /// assert_eq!(expected, serde_json::to_value(&d).unwrap()); /// /// // Deserialization works too /// // Subsecond precision in numbers will be rounded away /// /// let json = json!({ /// "d_u64": 12345, /// "d_f64": 12345.5, /// "d_string": "12346", /// }); /// let expected = Durations { /// d_u64: Duration::new(12345, 0), // Create from seconds and nanoseconds /// d_f64: Duration::new(12346, 0), /// d_string: Duration::new(12346, 0), /// }; /// assert_eq!(expected, serde_json::from_value(json).unwrap()); /// # } /// ``` /// /// [`chrono::Duration`] is also supported when using the `chrono` feature. /// It is a signed duration, thus can be de/serialized as an `i64` instead of a `u64`. /// /// ```rust /// # #[cfg(all(feature = "macros", feature = "chrono"))] { /// # use serde_derive::{Deserialize, Serialize}; /// # use serde_json::json; /// # use serde_with::{serde_as, DurationSeconds}; /// # use chrono_crate::Duration; /// # /* Ugliness to make the docs look nicer since I want to hide the rename of the chrono crate /// use chrono::Duration; /// # */ /// /// #[serde_as] /// # #[derive(Debug, PartialEq)] /// #[derive(Deserialize, Serialize)] /// struct Durations { /// #[serde_as(as = "DurationSeconds<i64>")] /// d_i64: Duration, /// #[serde_as(as = "DurationSeconds<f64>")] /// d_f64: Duration, /// #[serde_as(as = "DurationSeconds<String>")] /// d_string: Duration, /// }; /// /// // Serialization /// // See how the values get rounded, since subsecond precision is not allowed. /// /// let d = Durations { /// d_i64: Duration::seconds(-12345), /// d_f64: Duration::seconds(-12345) + Duration::milliseconds(500), /// d_string: Duration::seconds(12345) + Duration::nanoseconds(999_999_999), /// }; /// // Observe the different datatypes /// let expected = json!({ /// "d_i64": -12345, /// "d_f64": -12345.0, /// "d_string": "12346", /// }); /// assert_eq!(expected, serde_json::to_value(&d).unwrap()); /// /// // Deserialization works too /// // Subsecond precision in numbers will be rounded away /// /// let json = json!({ /// "d_i64": -12345, /// "d_f64": -12345.5, /// "d_string": "12346", /// }); /// let expected = Durations { /// d_i64: Duration::seconds(-12345), /// d_f64: Duration::seconds(-12346), /// d_string: Duration::seconds(12346), /// }; /// assert_eq!(expected, serde_json::from_value(json).unwrap()); /// # } /// ``` /// /// [`chrono::Duration`]: chrono_crate::Duration /// [feature flag]: https://docs.rs/serde_with/1.5.0/serde_with/guide/feature_flags/index.html #[derive(Copy, Clone, Debug, Default)] pub struct DurationSeconds< FORMAT: formats::Format = u64, STRICTNESS: formats::Strictness = formats::Strict, >(PhantomData<(FORMAT, STRICTNESS)>); /// De/Serialize Durations as number of seconds. /// /// De/serialize durations as number of seconds with subsecond precision. /// Subsecond precision is *only* supported for [`DurationSecondsWithFrac`], but not for [`DurationSeconds`]. /// You can configure the serialization format between integers, floats, and stringified numbers with the `FORMAT` specifier and configure the deserialization with the `STRICTNESS` specifier. /// /// The `STRICTNESS` specifier can either be [`formats::Strict`] or [`formats::Flexible`] and defaults to [`formats::Strict`]. /// [`formats::Strict`] means that deserialization only supports the type given in `FORMAT`, e.g., if `FORMAT` is `u64` deserialization from a `f64` will error. /// [`formats::Flexible`] means that deserialization will perform a best effort to extract the correct duration and allows deserialization from any type. /// For example, deserializing `DurationSeconds<f64, Flexible>` will discard any subsecond precision during deserialization from `f64` and will parse a `String` as an integer number. /// /// This type also supports `chrono::Duration` with the `chrono`-[feature flag]. /// /// | Duration Type | Converter | Available `FORMAT`s | /// | --------------------- | ------------------------- | ---------------------- | /// | `std::time::Duration` | `DurationSeconds` | `u64`, `f64`, `String` | /// | `std::time::Duration` | `DurationSecondsWithFrac` | `f64`, `String` | /// | `chrono::Duration` | `DurationSeconds` | `i64`, `f64`, `String` | /// | `chrono::Duration` | `DurationSecondsWithFrac` | `f64`, `String` | /// /// # Examples /// /// ```rust /// # #[cfg(feature = "macros")] { /// # use serde_derive::{Deserialize, Serialize}; /// # use serde_json::json; /// # use serde_with::{serde_as, DurationSecondsWithFrac}; /// use std::time::Duration; /// /// #[serde_as] /// # #[derive(Debug, PartialEq)] /// #[derive(Deserialize, Serialize)] /// struct Durations { /// #[serde_as(as = "DurationSecondsWithFrac<f64>")] /// d_f64: Duration, /// #[serde_as(as = "DurationSecondsWithFrac<String>")] /// d_string: Duration, /// }; /// /// // Serialization /// // See how the values get rounded, since subsecond precision is not allowed. /// /// let d = Durations { /// d_f64: Duration::new(12345, 500_000_000), // Create from seconds and nanoseconds /// d_string: Duration::new(12345, 999_999_000), /// }; /// // Observe the different datatypes /// let expected = json!({ /// "d_f64": 12345.5, /// "d_string": "12345.999999", /// }); /// assert_eq!(expected, serde_json::to_value(&d).unwrap()); /// /// // Deserialization works too /// // Subsecond precision in numbers will be rounded away /// /// let json = json!({ /// "d_f64": 12345.5, /// "d_string": "12345.987654", /// }); /// let expected = Durations { /// d_f64: Duration::new(12345, 500_000_000), // Create from seconds and nanoseconds /// d_string: Duration::new(12345, 987_654_000), /// }; /// assert_eq!(expected, serde_json::from_value(json).unwrap()); /// # } /// ``` /// /// [`chrono::Duration`] is also supported when using the `chrono` feature. /// It is a signed duration, thus can be de/serialized as an `i64` instead of a `u64`. /// /// ```rust /// # #[cfg(all(feature = "macros", feature = "chrono"))] { /// # use serde_derive::{Deserialize, Serialize}; /// # use serde_json::json; /// # use serde_with::{serde_as, DurationSecondsWithFrac}; /// # use chrono_crate::Duration; /// # /* Ugliness to make the docs look nicer since I want to hide the rename of the chrono crate /// use chrono::Duration; /// # */ /// /// #[serde_as] /// # #[derive(Debug, PartialEq)] /// #[derive(Deserialize, Serialize)] /// struct Durations { /// #[serde_as(as = "DurationSecondsWithFrac<f64>")] /// d_f64: Duration, /// #[serde_as(as = "DurationSecondsWithFrac<String>")] /// d_string: Duration, /// }; /// /// // Serialization /// /// let d = Durations { /// d_f64: Duration::seconds(-12345) + Duration::milliseconds(500), /// d_string: Duration::seconds(12345) + Duration::nanoseconds(999_999_000), /// }; /// // Observe the different datatypes /// let expected = json!({ /// "d_f64": -12344.5, /// "d_string": "12345.999999", /// }); /// assert_eq!(expected, serde_json::to_value(&d).unwrap()); /// /// // Deserialization works too /// /// let json = json!({ /// "d_f64": -12344.5, /// "d_string": "12345.987", /// }); /// let expected = Durations { /// d_f64: Duration::seconds(-12345) + Duration::milliseconds(500), /// d_string: Duration::seconds(12345) + Duration::milliseconds(987), /// }; /// assert_eq!(expected, serde_json::from_value(json).unwrap()); /// # } /// ``` /// /// [`chrono::Duration`]: chrono_crate::Duration /// [feature flag]: https://docs.rs/serde_with/1.5.0/serde_with/guide/feature_flags/index.html #[derive(Copy, Clone, Debug, Default)] pub struct DurationSecondsWithFrac< FORMAT: formats::Format = f64, STRICTNESS: formats::Strictness = formats::Strict, >(PhantomData<(FORMAT, STRICTNESS)>); /// De/Serialize timestamps as seconds since the UNIX epoch /// /// De/serialize timestamps as seconds since the UNIX epoch. /// Subsecond precision is *only* supported for [`TimestampSecondsWithFrac`], but not for [`TimestampSeconds`]. /// You can configure the serialization format between integers, floats, and stringified numbers with the `FORMAT` specifier and configure the deserialization with the `STRICTNESS` specifier. /// /// The `STRICTNESS` specifier can either be [`formats::Strict`] or [`formats::Flexible`] and defaults to [`formats::Strict`]. /// [`formats::Strict`] means that deserialization only supports the type given in `FORMAT`, e.g., if `FORMAT` is `i64` deserialization from a `f64` will error. /// [`formats::Flexible`] means that deserialization will perform a best effort to extract the correct timestamp and allows deserialization from any type. /// For example, deserializing `TimestampSeconds<f64, Flexible>` will discard any subsecond precision during deserialization from `f64` and will parse a `String` as an integer number. /// /// This type also supports `chrono::DateTime` with the `chrono`-[feature flag]. /// /// | Timestamp Type | Converter | Available `FORMAT`s | /// | ------------------------- | -------------------------- | ---------------------- | /// | `std::time::SystemTime` | `TimestampSeconds` | `i64`, `f64`, `String` | /// | `std::time::SystemTime` | `TimestampSecondsWithFrac` | `f64`, `String` | /// | `chrono::DateTime<Utc>` | `TimestampSeconds` | `i64`, `f64`, `String` | /// | `chrono::DateTime<Utc>` | `TimestampSecondsWithFrac` | `f64`, `String` | /// | `chrono::DateTime<Local>` | `TimestampSeconds` | `i64`, `f64`, `String` | /// | `chrono::DateTime<Local>` | `TimestampSecondsWithFrac` | `f64`, `String` | /// /// # Examples /// /// ```rust /// # #[cfg(feature = "macros")] { /// # use serde_derive::{Deserialize, Serialize}; /// # use serde_json::json; /// # use serde_with::{serde_as, TimestampSeconds}; /// use std::time::{Duration, SystemTime}; /// /// #[serde_as] /// # #[derive(Debug, PartialEq)] /// #[derive(Deserialize, Serialize)] /// struct Timestamps { /// #[serde_as(as = "TimestampSeconds<i64>")] /// st_i64: SystemTime, /// #[serde_as(as = "TimestampSeconds<f64>")] /// st_f64: SystemTime, /// #[serde_as(as = "TimestampSeconds<String>")] /// st_string: SystemTime, /// }; /// /// // Serialization /// // See how the values get rounded, since subsecond precision is not allowed. /// /// let ts = Timestamps { /// st_i64: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 0)).unwrap(), /// st_f64: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 500_000_000)).unwrap(), /// st_string: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 999_999_999)).unwrap(), /// }; /// // Observe the different datatypes /// let expected = json!({ /// "st_i64": 12345, /// "st_f64": 12346.0, /// "st_string": "12346", /// }); /// assert_eq!(expected, serde_json::to_value(&ts).unwrap()); /// /// // Deserialization works too /// // Subsecond precision in numbers will be rounded away /// /// let json = json!({ /// "st_i64": 12345, /// "st_f64": 12345.5, /// "st_string": "12346", /// }); /// let expected = Timestamps { /// st_i64: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 0)).unwrap(), /// st_f64: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12346, 0)).unwrap(), /// st_string: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12346, 0)).unwrap(), /// }; /// assert_eq!(expected, serde_json::from_value(json).unwrap()); /// # } /// ``` /// /// [`chrono::DateTime<Utc>`] and [`chrono::DateTime<Local>`] are also supported when using the `chrono` feature. /// Like [`SystemTime`], it is a signed timestamp, thus can be de/serialized as an `i64`. /// /// ```rust /// # #[cfg(all(feature = "macros", feature = "chrono"))] { /// # use serde_derive::{Deserialize, Serialize}; /// # use serde_json::json; /// # use serde_with::{serde_as, TimestampSeconds}; /// # use chrono_crate::{DateTime, Local, TimeZone, Utc}; /// # /* Ugliness to make the docs look nicer since I want to hide the rename of the chrono crate /// use chrono::{DateTime, Local, TimeZone, Utc}; /// # */ /// /// #[serde_as] /// # #[derive(Debug, PartialEq)] /// #[derive(Deserialize, Serialize)] /// struct Timestamps { /// #[serde_as(as = "TimestampSeconds<i64>")] /// dt_i64: DateTime<Utc>, /// #[serde_as(as = "TimestampSeconds<f64>")] /// dt_f64: DateTime<Local>, /// #[serde_as(as = "TimestampSeconds<String>")] /// dt_string: DateTime<Utc>, /// }; /// /// // Serialization /// // See how the values get rounded, since subsecond precision is not allowed. /// /// let ts = Timestamps { /// dt_i64: Utc.timestamp(-12345, 0), /// dt_f64: Local.timestamp(-12345, 500_000_000), /// dt_string: Utc.timestamp(12345, 999_999_999), /// }; /// // Observe the different datatypes /// let expected = json!({ /// "dt_i64": -12345, /// "dt_f64": -12345.0, /// "dt_string": "12346", /// }); /// assert_eq!(expected, serde_json::to_value(&ts).unwrap()); /// /// // Deserialization works too /// // Subsecond precision in numbers will be rounded away /// /// let json = json!({ /// "dt_i64": -12345, /// "dt_f64": -12345.5, /// "dt_string": "12346", /// }); /// let expected = Timestamps { /// dt_i64: Utc.timestamp(-12345, 0), /// dt_f64: Local.timestamp(-12346, 0), /// dt_string: Utc.timestamp(12346, 0), /// }; /// assert_eq!(expected, serde_json::from_value(json).unwrap()); /// # } /// ``` /// /// [`SystemTime`]: std::time::SystemTime /// [feature flag]: https://docs.rs/serde_with/1.5.0/serde_with/guide/feature_flags/index.html #[derive(Copy, Clone, Debug, Default)] pub struct TimestampSeconds< FORMAT: formats::Format = i64, STRICTNESS: formats::Strictness = formats::Strict, >(PhantomData<(FORMAT, STRICTNESS)>); /// De/Serialize timestamps as seconds since the UNIX epoch /// /// De/serialize timestamps as seconds since the UNIX epoch. /// Subsecond precision is *only* supported for [`TimestampSecondsWithFrac`], but not for [`TimestampSeconds`]. /// You can configure the serialization format between integers, floats, and stringified numbers with the `FORMAT` specifier and configure the deserialization with the `STRICTNESS` specifier. /// /// The `STRICTNESS` specifier can either be [`formats::Strict`] or [`formats::Flexible`] and defaults to [`formats::Strict`]. /// [`formats::Strict`] means that deserialization only supports the type given in `FORMAT`, e.g., if `FORMAT` is `i64` deserialization from a `f64` will error. /// [`formats::Flexible`] means that deserialization will perform a best effort to extract the correct timestamp and allows deserialization from any type. /// For example, deserializing `TimestampSeconds<f64, Flexible>` will discard any subsecond precision during deserialization from `f64` and will parse a `String` as an integer number. /// /// This type also supports `chrono::DateTime` with the `chrono`-[feature flag]. /// /// | Timestamp Type | Converter | Available `FORMAT`s | /// | ------------------------- | -------------------------- | ---------------------- | /// | `std::time::SystemTime` | `TimestampSeconds` | `i64`, `f64`, `String` | /// | `std::time::SystemTime` | `TimestampSecondsWithFrac` | `f64`, `String` | /// | `chrono::DateTime<Utc>` | `TimestampSeconds` | `i64`, `f64`, `String` | /// | `chrono::DateTime<Utc>` | `TimestampSecondsWithFrac` | `f64`, `String` | /// | `chrono::DateTime<Local>` | `TimestampSeconds` | `i64`, `f64`, `String` | /// | `chrono::DateTime<Local>` | `TimestampSecondsWithFrac` | `f64`, `String` | /// /// # Examples /// /// ```rust /// # #[cfg(feature = "macros")] { /// # use serde_derive::{Deserialize, Serialize}; /// # use serde_json::json; /// # use serde_with::{serde_as, TimestampSecondsWithFrac}; /// use std::time::{Duration, SystemTime}; /// /// #[serde_as] /// # #[derive(Debug, PartialEq)] /// #[derive(Deserialize, Serialize)] /// struct Timestamps { /// #[serde_as(as = "TimestampSecondsWithFrac<f64>")] /// st_f64: SystemTime, /// #[serde_as(as = "TimestampSecondsWithFrac<String>")] /// st_string: SystemTime, /// }; /// /// // Serialization /// // See how the values get rounded, since subsecond precision is not allowed. /// /// let ts = Timestamps { /// st_f64: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 500_000_000)).unwrap(), /// st_string: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 999_999_000)).unwrap(), /// }; /// // Observe the different datatypes /// let expected = json!({ /// "st_f64": 12345.5, /// "st_string": "12345.999999", /// }); /// assert_eq!(expected, serde_json::to_value(&ts).unwrap()); /// /// // Deserialization works too /// // Subsecond precision in numbers will be rounded away /// /// let json = json!({ /// "st_f64": 12345.5, /// "st_string": "12345.987654", /// }); /// let expected = Timestamps { /// st_f64: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 500_000_000)).unwrap(), /// st_string: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 987_654_000)).unwrap(), /// }; /// assert_eq!(expected, serde_json::from_value(json).unwrap()); /// # } /// ``` /// /// [`chrono::DateTime<Utc>`] and [`chrono::DateTime<Local>`] are also supported when using the `chrono` feature. /// Like [`SystemTime`], it is a signed timestamp, thus can be de/serialized as an `i64`. /// /// ```rust /// # #[cfg(all(feature = "macros", feature = "chrono"))] { /// # use serde_derive::{Deserialize, Serialize}; /// # use serde_json::json; /// # use serde_with::{serde_as, TimestampSecondsWithFrac}; /// # use chrono_crate::{DateTime, Local, TimeZone, Utc}; /// # /* Ugliness to make the docs look nicer since I want to hide the rename of the chrono crate /// use chrono::{DateTime, Local, TimeZone, Utc}; /// # */ /// /// #[serde_as] /// # #[derive(Debug, PartialEq)] /// #[derive(Deserialize, Serialize)] /// struct Timestamps { /// #[serde_as(as = "TimestampSecondsWithFrac<f64>")] /// dt_f64: DateTime<Utc>, /// #[serde_as(as = "TimestampSecondsWithFrac<String>")] /// dt_string: DateTime<Local>, /// }; /// /// // Serialization /// /// let ts = Timestamps { /// dt_f64: Utc.timestamp(-12345, 500_000_000), /// dt_string: Local.timestamp(12345, 999_999_000), /// }; /// // Observe the different datatypes /// let expected = json!({ /// "dt_f64": -12344.5, /// "dt_string": "12345.999999", /// }); /// assert_eq!(expected, serde_json::to_value(&ts).unwrap()); /// /// // Deserialization works too /// /// let json = json!({ /// "dt_f64": -12344.5, /// "dt_string": "12345.987", /// }); /// let expected = Timestamps { /// dt_f64: Utc.timestamp(-12345, 500_000_000), /// dt_string: Local.timestamp(12345, 987_000_000), /// }; /// assert_eq!(expected, serde_json::from_value(json).unwrap()); /// # } /// ``` /// /// [`SystemTime`]: std::time::SystemTime /// [feature flag]: https://docs.rs/serde_with/1.5.0/serde_with/guide/feature_flags/index.html #[derive(Copy, Clone, Debug, Default)] pub struct TimestampSecondsWithFrac< FORMAT: formats::Format = f64, STRICTNESS: formats::Strictness = formats::Strict, >(PhantomData<(FORMAT, STRICTNESS)>);