# dade
[](https://crates.io/crates/dade)
`dade` is a framework for defining data structure to Rust structures, like [pydantic](https://pydantic-docs.helpmanual.io) in Python.
For the easy handle of data, the following will support it.
+ [x] validation for (primitive) types.
+ [x] numeric types; u8, u16, u32, u64, u128, usize, i8, i16, i32, i64, i128, isize, f32, f64
+ [x] boolean
+ [x] String
+ [x] Optional
+ [x] Vec
+ [x] nested model
+ [x] enum
+ [x] export a data schema conforms JsonSchema.
+ [x] load a model from JSON.
+ [x] dump a JSON-string from a model.
+ [ ] implements for useful types. e.g. URL, email and etc.
+ [ ] publish a trait that for you implements any custom type with your validation.
See [documentation](https://odd12258053.github.io/dade/) for more details.
## Roadmap
+ ~~implements for basic idea.~~
+ ~~implements for (primitive) types, enum, and more.~~
+ support configuration of a model, for example, set a given name to a title in JsonSchema, or exclusion another key.
+ implements for useful types and a trait for custom type.
## Example
### Basic
To define a model, You need the below module.
```rust
use dade::{Model, model};
```
For example, define user-model.
```rust
#[model]
struct User {
#[field(ge = 1)]
id: u64,
#[field(min_length = 1, max_length = 100)]
name: String,
#[field(default = "en")]
lang: String,
#[field(min_length = 1, max_length = 255, default = null)]
url: Option<String>,
#[field(default = false)]
verified: bool,
}
```
Then you create an instance of the model by the below.
```rust
let input = "{\"id\": 1, \"name\": \"James Smith\"}";
let user = User::parse(input).unwrap();
```
And you get a Json string for the instance by the below.
```rust
let json_string = user.json(false);
// json_string = "{\"id\":1,\"name\":\"James Smith\",\"lang\":\"en\",\"url\":null,\"verified\":false}"
```
If you want to validate a value, you will get a schema that conforms JsonSchema, for the given model, by the below.
```rust
let schema = User::schema();
```
The schema is
```json
{
"$ref": "#/definitions/User",
"definitions": {
"User": {
"title": "User",
"type": "object",
"properties": {
"id": {
"type": "integer",
"title": "Id",
"minimum": 1
},
"name": {
"type": "string",
"title": "Name",
"minLength": 1,
"maxLength": 100
},
"lang": {
"type": "string",
"title": "Lang",
"default": "en"
},
"url": {
"type": "string",
"title": "Url",
"default": null,
"minLength": 1,
"maxLength": 255
},
"verified": {
"type": "boolean",
"title": "Verified",
"default": false
}
},
"required": ["id", "name"]
}
}
}
```
### Advance
* If you want to bind other name
```rust
#[model]
struct User {
id: u64,
#[field(alias = "FirstName")]
first_name: String,
#[field(alias = "LastName")]
last_name: String,
}
```
* If you need a nested model
```rust
#[model]
struct Name {
first_name: String,
last_name: String,
}
#[model]
struct User {
id: u64,
name: Name,
}
```
* If you need a self-reference model
```rust
#[model]
struct Item {
id: u64,
name: String,
value: u128,
related_items: Option<Vec<Box<Item>>>,
}
```