Implementing `modelName` for fields and classes.

[wxxedu]

Motivation

dust identifies the fields by conducting an fnv64_hash on the model name and the field name. This creates a strong binding to the name of the models that you defined. Hence, this prevents you from changing the name while still preserving the data in dust.

Implementation

To allow refactoring of names for the dust side, we should implement an additional annotation for the fields called ModelName, and add a modelName field to the class.

Say that you have a todo class:

@Model()
class Todo with _$Todo {
    Todo._();

    factory Todo({required String name}) = _Todo;
}

And you realized that instead of calling the field name, you want to call it title. Instead of calling the model Todo, you want to call it Task. Your old data would not be usable after the name change with the current state of dust. With this proposed implementation, you have:

@Model(modelName: "Todo")
class Task with _$Task {
    Task._();

    factory Task({@ModelName("name") required String title}) = _Task;
}

And dust would need to still generate the fnv64 hash using the "Todo" and "name", while naming the model "Task" and the field "title".

[wxxedu]

Don't know why i accidentally closed this issue!