Performance on selecting all columns instead of specified attributes

Is there a reason the _model_class queries all columns?

https://github.com/cerebris/jsonapi-resources/blob/bf4b4cd7d79da453372880068e167066f0d05f47/lib/jsonapi/active_relation_resource.rb#L286-L288

This is a huge performance impact on models with many columns that may not ever be used by the resource.

It seems for performance reasons it makes sense to only select the attributes defined in the JSONAPI::Resource class.

A workaround for now is to override each resource using .select to retrieve only the fields that are specifically defined.

attributes :name, :address

def self.records(_options = {})
  super.select(self.fields)
end

This should also take into account sparse fieldsets parameters, which would further limit which columns are selected.

lib/jsonapi/active_relation_resource.rb のリンクされた _model_class クエリから始め、Resource の属性と sparse fieldsets がどのように表現されているかを追跡します。これらのクエリが resource とリクエストされた fieldset に必要なフィールドだけを選択し、既存の records の動作を維持しながら、関連するクエリパスを網羅できた時点で作業は完了です。