https://github.com/h2co3/magnet
A JSON/BSON schema generator
https://github.com/h2co3/magnet
bson crates database json-schema mongodb schema
Last synced: 4 days ago
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A JSON/BSON schema generator
- Host: GitHub
- URL: https://github.com/h2co3/magnet
- Owner: H2CO3
- License: mit
- Created: 2018-04-10T17:48:19.000Z (about 7 years ago)
- Default Branch: master
- Last Pushed: 2021-11-24T14:35:33.000Z (over 3 years ago)
- Last Synced: 2025-04-20T17:40:55.350Z (14 days ago)
- Topics: bson, crates, database, json-schema, mongodb, schema
- Language: Rust
- Size: 107 KB
- Stars: 17
- Watchers: 3
- Forks: 4
- Open Issues: 4
-
Metadata Files:
- Readme: README.md
- License: LICENSE.txt
Awesome Lists containing this project
README
# Magnet, a JSON schema generator
[](https://crates.io/crates/magnet_schema)
[](https://docs.rs/magnet_schema)
[](https://crates.io/crates/magnet_schema)
[](https://github.com/H2CO3/magnet/blob/master/LICENSE.txt)
[](https://github.com/Aaronepower/tokei)
[](http://twitter.com/H2CO3_iOS)
These two related crates, `magnet_derive` and `magnet_schema` help you define (and, in most cases, automatically derive) MongoDB-flavored [JSON schemas](https://docs.mongodb.com/manual/reference/operator/query/jsonSchema/#extensions) for your domain model types. Currently, the primary use case for this library is to make it easy to validate serializeable types when using [Avocado](https://docs.rs/avocado/) or the [MongoDB Rust driver](https://docs.rs/mongodb/).
The defined `BsonSchema` trait defines a single function, `bson_schema`, which should/will return a Bson `Document` that is a valid JSON schema describing the structure of the implementing type. Example:
```rust
#[macro_use]
extern crate serde_derive;
extern crate serde;
#[macro_use]
extern crate bson;
#[macro_use]
extern crate magnet_derive;
extern crate magnet_schema;
extern crate mongodb;
use std::collections::HashSet;
use magnet_schema::BsonSchema;
use mongodb::{ Client, ThreadedClient, CommandType };
use mongodb::db::{ ThreadedDatabase };
#[derive(BsonSchema)]
struct Person {
name: String,
nicknames: HashSet,
age: usize,
contact: Option,
}
#[derive(BsonSchema, Serialize, Deserialize)]
#[serde(tag = "type", content = "value")]
enum Contact {
Email(String),
Phone(u64),
}
fn main() {
let schema = Person::bson_schema();
let spec = doc! {
"create": "Person",
"validator": { "$jsonSchema": schema },
};
let client = Client::connect("localhost", 27017).expect("can't connect to mongod");
let db = client.db("Example");
db.command(spec, CommandType::CreateCollection, None).expect("network error");
// etc.
}
```
For milestones and custom `#[attributes]`, please see the [documentation](https://docs.rs/magnet_schema).
## Release Notes
### v0.8.0
* Implement `BsonSchema` for `VecDeque`, `BinaryHeap`, `LinkedList`, `Range`, `RangeInclusive`, and `PhantomData`
* Add `Eq + Hash` and `Ord` bounds on map keys and set elements where appropriate
### v0.7.0
* Upgrade `uuid` dependency to 0.7.1, and include `v4` and `serde` features
* Upgrade `url` dependency to `1.7.2`
### v0.6.0
* `impl BsonSchema` for arrays of size 2N between 128 and 65536; and sizes 1.5 * 2N between 96 and 1536.
* Rewrite generics handling using `syn::Generics::split_for_impl`
* Use scoped lints in `magnet_schema` as well
### v0.5.0
* Handle generic types with default generic parameters correctly, by not including the defaults in the generated `impl` (which would result in a compiler error)
* Use scoped lints for Clippy
* Update some dependencies
### v0.4.0
* Update `bson` to `0.13.0` and require its `u2i` feature. This version fixes a
bug where unit struct were serialized as 1-element arrays. The `u2i` feature
allows unsigned integers (within the appropriate range) to be serialized as
signed integers.
### v0.3.3
* Fix a bug where `Option` was not allowed to be `null`/`None` by the
generated BSON schema
* Remove an incorrect item from the documentation
* Fix several Clippy lints
* Update dependencies
### v0.3.2
* `impl BsonSchema for Document`
* `impl BsonSchema for ObjectId`
* Documentation improvements
* Update dependencies
### v0.3.1
* Relax `Display` bound for `HashMap`/`BTreeMap` keys, use `ToString` instead
* Update `proc_macro2` dependency so that we can use `TokenStream::default()`
### v0.3.0
* Remove `#[magnet(rename = "...")]` attribute
* `UnorderedDoc::eq()`, `assert_doc_eq!` and `assert_doc_ne!` no longer clone their arguments
* Update `syn` and `quote` dependencies
* Improve documentation
### v0.2.1
* Update `bson` dependency
### v0.2.0
* Support for generic types
### v0.1.4
* Unit tests and a test suite have been added.
* Bug fix: `Option::bson_schema()` didn't handle the `bsonType` field, so `Option` wasn't allowed to be `null`. This has been corrected.
* Bug fix: every generated schema now uses `Bson::I64` for representing array lengths / collection counts
* Enhancement: `impl BsonSchema for { HashMap, BTreeMap }` now has a less stringent trait bound on the key. It is now `Display` instead of `AsRef`.
### v0.1.3
* Add support for `#[magnet(min_incl = "...", min_excl = "...", max_incl = "...", max_excl = "...")]` attributes on struct fields (named as well as newtype and tuple)
### v0.1.2
* Add support for `enum`s, respecting Serde's tagging conventions (untagged/external/internal/adjacent), except newtype variants around other (inner) `enum`s
* Refactoring, code quality improvements
### v0.1.1
* Add support for newtype structs and tuple structs
* Respect `#[serde(rename_all = "...")]` and `#[serde(rename = "...")]` attributes
* Add Serde-conform case conversion
* Code formatting / organization and documentation improvements
### v0.1.0
* Initial release, only regular structs with named fields are supported