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.

Beginne in lib/jsonapi/active_relation_resource.rb bei der verknüpften _model_class-Abfrage und verfolge, wie Resource-Attribute und sparse fieldsets dargestellt werden. Die Arbeit ist abgeschlossen, wenn diese Abfragen nur die vom resource und vom angeforderten fieldset benötigten Felder auswählen, dabei das bestehende records-Verhalten erhalten bleibt und die relevanten Abfragepfade abgedeckt sind.