brylix 0.2.9

GraphQL framework for AWS Lambda with SeaORM and multi-tenant support
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
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

//! JSON column helpers for working with `serde_json::Value` fields.
//!
//! When using SeaORM with JSON columns, values are often stored as
//! `Option<serde_json::Value>`. This module provides extension traits
//! for ergonomic parsing of these values.
//!
//! # Usage
//!
//! ```rust
//! use brylix::helpers::json::JsonValueExt;
//! use serde_json::json;
//!
//! let value = Some(json!({"name": "John", "age": 30}));
//!
//! // Parse into a typed struct
//! let name: Option<String> = value.parse_as();
//!
//! // Parse with a default fallback
//! let tags: Vec<String> = None::<serde_json::Value>.parse_or_default();
//! assert!(tags.is_empty());
//! ```

use serde::de::DeserializeOwned;
use serde_json::Value;

/// Extension trait for parsing JSON values into typed Rust structures.
pub trait JsonValueExt {
    /// Parse the JSON value into the target type.
    ///
    /// Returns `None` if the value is `None` or deserialization fails.
    fn parse_as<T: DeserializeOwned>(&self) -> Option<T>;

    /// Parse the JSON value into the target type, falling back to `Default`.
    ///
    /// Returns `T::default()` if the value is `None` or deserialization fails.
    fn parse_or_default<T: DeserializeOwned + Default>(&self) -> T;
}

impl JsonValueExt for Option<Value> {
    fn parse_as<T: DeserializeOwned>(&self) -> Option<T> {
        self.as_ref()
            .and_then(|v| serde_json::from_value(v.clone()).ok())
    }

    fn parse_or_default<T: DeserializeOwned + Default>(&self) -> T {
        self.parse_as().unwrap_or_default()
    }
}

impl JsonValueExt for Value {
    fn parse_as<T: DeserializeOwned>(&self) -> Option<T> {
        serde_json::from_value(self.clone()).ok()
    }

    fn parse_or_default<T: DeserializeOwned + Default>(&self) -> T {
        self.parse_as().unwrap_or_default()
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use serde::Deserialize;
    use serde_json::json;

    #[derive(Debug, Deserialize, PartialEq)]
    struct TestData {
        name: String,
        age: u32,
    }

    #[test]
    fn test_parse_as_option_value_some() {
        let value: Option<Value> = Some(json!({"name": "John", "age": 30}));
        let result: Option<TestData> = value.parse_as();
        assert_eq!(
            result,
            Some(TestData {
                name: "John".to_string(),
                age: 30
            })
        );
    }

    #[test]
    fn test_parse_as_option_value_none() {
        let value: Option<Value> = None;
        let result: Option<TestData> = value.parse_as();
        assert!(result.is_none());
    }

    #[test]
    fn test_parse_as_option_value_invalid() {
        let value: Option<Value> = Some(json!("not a struct"));
        let result: Option<TestData> = value.parse_as();
        assert!(result.is_none());
    }

    #[test]
    fn test_parse_or_default_option_value() {
        let value: Option<Value> = Some(json!(["a", "b", "c"]));
        let result: Vec<String> = value.parse_or_default();
        assert_eq!(result, vec!["a", "b", "c"]);
    }

    #[test]
    fn test_parse_or_default_option_value_none() {
        let value: Option<Value> = None;
        let result: Vec<String> = value.parse_or_default();
        assert!(result.is_empty());
    }

    #[test]
    fn test_parse_as_value() {
        let value = json!({"name": "Jane", "age": 25});
        let result: Option<TestData> = value.parse_as();
        assert_eq!(
            result,
            Some(TestData {
                name: "Jane".to_string(),
                age: 25
            })
        );
    }

    #[test]
    fn test_parse_or_default_value() {
        let value = json!([1, 2, 3]);
        let result: Vec<i32> = value.parse_or_default();
        assert_eq!(result, vec![1, 2, 3]);
    }

    #[test]
    fn test_parse_or_default_value_invalid() {
        let value = json!("not a vec");
        let result: Vec<i32> = value.parse_or_default();
        assert!(result.is_empty());
    }
}