use sqlx.types.Json<T> as a schema in utoipa

[vncsalencar]

When using a struct that has sqlx.types.Json<T>, utoipa throws Could not resolve reference: Could not resolve pointer: /components/schemas/sqlx.types.Json does not exist in document`.
How does one deal with it?

[jayvdb]

Three solution:

1. add sqlx support to utoipa
2. add utoipa support to sqlx
3. use utoipa's #[schema(schema_with = ...)] on your struct field to glue in support for sqlx fields.

e.g.

#[derive(..., utoipa::ToSchema)]
struct Foo {
    ...
    #[schema(schema_with = create_sqlx_json_schema::<Bar>)]
    pub bar: sqlx.types.Json<Bar>,
    ...
}

pub fn create_sqlx_json_schema<T: for<'a> ToSchema<'a>>() -> Object {
    ObjectBuilder::new()
        .property("inner", ...)
        .required("inner")
        .build()
}