Custom keywords

[clemens-msupply]

JSONSchema allows users to define custom keywords. Would it be possible to add support for it to schemars? e.g.

#[derive(JsonSchema)]
pub struct MyStruct {
    #[schemars(custom_keyword(name = "myKeyword", value = "some custom metadata"))]
    pub my_int: i32,
}

would generate:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "MyStruct",
  "type": "object",
  "required": [
    "my_int"
  ],
  "properties": {
    "my_int": {
      "type": "integer",
      "format": "int32",
      "myKeyword": "some custom metadata")
    },
  },
}

[ralpha]

This is currently possible though manual implementation. Not though the macro. Manual implementation of struct example: #119 Use the extensions field in the SchemaObject.

Adding support for it though macros might be added, but not any time soon I expect.

[mickvangelderen]

I'm looking to add custom metadata to properties as well, ideally in-line with the type definition through an attribute. I'm building a configuration tool on top of json schemas and want to indicate for various properties whether they should be visible by default or only for advanced users.