serde-decimal 0.2.6

Careful serialization of rust_decimal types
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

//! Serialization and deserialization of not required but not nullable decimals as strings.

use std::fmt;

use rust_decimal::Decimal;
use serde_core::{de, Deserialize, Deserializer, Serializer};

struct OptionDecimalVisitor;

impl<'de> de::Visitor<'de> for OptionDecimalVisitor {
    type Value = Option<Decimal>;

    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
        formatter.write_str("a Decimal type representing a fixed-point number")
    }

    fn visit_some<D>(self, d: D) -> Result<Option<Decimal>, D::Error>
    where
        D: Deserializer<'de>,
    {
        <Decimal as Deserialize>::deserialize(d).map(Some)
    }
}

/// Non-required string-form decimal deserializer.
///
/// See [module docs](self) for more.
pub fn deserialize<'de, D>(deserializer: D) -> Result<Option<rust_decimal::Decimal>, D::Error>
where
    D: Deserializer<'de>,
{
    deserializer.deserialize_option(OptionDecimalVisitor)
}

/// Non-required string-form decimal deserializer.
///
/// See [module docs](self) for more.
pub fn serialize<S>(value: &Option<rust_decimal::Decimal>, serializer: S) -> Result<S::Ok, S::Error>
where
    S: Serializer,
{
    rust_decimal::serde::str_option::serialize(value, serializer)
}

#[cfg(test)]
mod tests {
    use rust_decimal_macros::dec;

    #[derive(serde::Serialize, serde::Deserialize, Clone, Debug)]
    struct Foo {
        #[serde(default)]
        #[serde(skip_serializing_if = "Option::is_none")]
        #[serde(with = "crate::non_required_str")]
        foo: Option<rust_decimal::Decimal>,
    }

    #[derive(serde::Serialize, serde::Deserialize, Clone, Debug)]
    struct Bar {
        #[serde(flatten)]
        foo: Foo,
    }

    #[test]
    fn foo_serialize_some() {
        let serialized = serde_json::to_string(&Foo {
            foo: Some(dec!(0.1)),
        })
        .unwrap();
        assert_eq!(serialized, r#"{"foo":"0.1"}"#);
    }

    #[test]
    fn foo_serialize_none() {
        let serialized = serde_json::to_string(&Foo { foo: None }).unwrap();
        assert_eq!(serialized, r#"{}"#);
    }

    #[test]
    fn foo_deserialize_some() {
        let deserialized: Foo = serde_json::from_str(r#"{"foo":"0.1"}"#).unwrap();
        assert!(matches!(deserialized, Foo { foo: Some(_) }));
    }

    #[test]
    fn foo_deserialize_missing() {
        let deserialized: Foo = serde_json::from_str(r#"{}"#).unwrap();
        assert!(matches!(deserialized, Foo { foo: None }));
    }

    #[test]
    #[should_panic]
    fn foo_deserialize_null() {
        serde_json::from_str::<Foo>(r#"{"foo": null}"#).unwrap();
    }

    #[test]
    fn bar_serialize_some() {
        let serialized = serde_json::to_string(&Bar {
            foo: Foo {
                foo: Some(dec!(0.1)),
            },
        })
        .unwrap();
        assert_eq!(serialized, r#"{"foo":"0.1"}"#);
    }

    #[test]
    fn bar_serialize_none() {
        let serialized = serde_json::to_string(&Bar {
            foo: Foo { foo: None },
        })
        .unwrap();
        assert_eq!(serialized, r#"{}"#);
    }

    #[test]
    fn bar_deserialize_some() {
        let deserialized: Bar = serde_json::from_str(r#"{"foo":"0.1"}"#).unwrap();
        assert!(matches!(
            deserialized,
            Bar {
                foo: Foo { foo: Some(_) }
            }
        ));
    }

    #[test]
    fn bar_deserialize_missing() {
        let deserialized: Bar = serde_json::from_str(r#"{}"#).unwrap();
        assert!(matches!(
            deserialized,
            Bar {
                foo: Foo { foo: None }
            }
        ));
    }

    #[test]
    #[should_panic]
    fn bar_deserialize_null() {
        serde_json::from_str::<Bar>(r#"{"foo": null}"#).unwrap();
    }
}