fieldx 0.2.3

Procedural macro for constructing structs with lazily initialized fields, builder pattern, and serde support with a focus on declarative syntax.
Documentation 
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

#![cfg(all(feature = "serde", feature = "sync"))]
use fieldx::fxstruct;
use serde::Deserialize;
use serde::Serialize;

#[fxstruct(sync, get, serde(default(Self::serde_default().into())))]
#[derive(Clone)]
struct Foo {
    f1: String,
    f2: String,
}

impl Foo {
    fn serde_default() -> Self {
        Self {
            f1: "f1 default".to_string(),
            f2: "f2 default".to_string(),
        }
    }
}

#[fxstruct(sync, get, serde(default("Self::serde_default")))]
#[derive(Clone)]
struct Bar {
    f1: String,
    f2: String,
}

impl Bar {
    fn serde_default() -> __BarShadow {
        Self {
            f1: "f1 default".to_string(),
            f2: "f2 default".to_string(),
        }
        .into()
    }
}

#[fxstruct(sync, get, serde(shadow_name("BazDup"), default(Self::serde_default().into())))]
#[derive(Clone)]
struct Baz {
    f1: String,
    f2: String,
}

impl Baz {
    fn serde_default() -> Fubar {
        Fubar {
            postfix: "from fubar".into(),
        }
    }
}

struct Fubar {
    postfix: String,
}

impl From<Fubar> for BazDup {
    fn from(value: Fubar) -> Self {
        Self {
            f1: format!("f1 {}", value.postfix),
            f2: format!("f2 {}", value.postfix),
        }
    }
}

#[test]
fn missing_key_meta() {
    let json_src = r#"{"f2": "f2 json"}"#;
    let foo_de = serde_json::from_str::<Foo>(json_src).expect("Foo deserialization failure");
    assert_eq!(*foo_de.f1(), "f1 default".to_string());
    assert_eq!(*foo_de.f2(), "f2 json".to_string());

    let json_src = r#"{"f2": "f2 json", "f1": "f1 json"}"#;
    let foo_de = serde_json::from_str::<Foo>(json_src).expect("Foo deserialization failure");
    assert_eq!(*foo_de.f1(), "f1 json".to_string());
}

#[test]
fn missing_key_str() {
    let json_src = r#"{"f2": "f2 json"}"#;
    let foo_de = serde_json::from_str::<Bar>(json_src).expect("Bar deserialization failure");
    assert_eq!(*foo_de.f1(), "f1 default".to_string());
    assert_eq!(*foo_de.f2(), "f2 json".to_string());

    let json_src = r#"{"f2": "f2 json", "f1": "f1 json"}"#;
    let foo_de = serde_json::from_str::<Bar>(json_src).expect("Bar deserialization failure");
    assert_eq!(*foo_de.f1(), "f1 json".to_string());
}

#[test]
fn missing_with_3rd_party() {
    let json_src = r#"{"f1": "f1 json"}"#;
    let foo_de = serde_json::from_str::<Baz>(json_src).expect("Bar deserialization failure");
    assert_eq!(*foo_de.f1(), "f1 json".to_string());
    assert_eq!(*foo_de.f2(), "f2 from fubar".to_string());

    let json_src = r#"{"f2": "f2 json", "f1": "f1 json"}"#;
    let foo_de = serde_json::from_str::<Baz>(json_src).expect("Bar deserialization failure");
    assert_eq!(*foo_de.f1(), "f1 json".to_string());
}