Provide a way to control which fields in a content file are mapped to which record fields

[fujidaiti]

Suppose we have a JSON file such as:

{ "phone_number": "XX-XXX-XXX" }

and want to convert it as:

({ String phoneNumber })

Then, we need to tell the code generator that "phone_number" should be mapped to phoneNumber of String. One idea is to introduce a new annotation like RefKey and use it as:

@EmbedLiteral("my_data.json")
const ({ @RefKey("phone_number") String phoneNumber }) embedding = _$embedding;

Given this source, the generator will dump the following code:

const _$embedding = ( phoneNumber: "XX-XXX-XXX" );

[fujidaiti]

It appears that annotations on record fields won't be implemented, at least until the macro feature is released.

dart-lang/language#2471 (comment)