PrivateRelation is not aware of class methods

[rzane]

ActiveRecord provides two ways to define scopes. The first is scope, which Tapioca generates RBI definitions for. ActiveRecord also allows scopes to be defined as class methods:

class Post < ActiveRecord::Base
  def self.published
    where(published: true)
  end
end

Tapioca's PrivateRelation doesn't include these scopes. Referring to one of these scopes produces a type error:

Post.all.published
         ^^^^^^^^^ Method published does not exist on Post::PrivateRelation

[paracycle]

This is not how Active Record works, so this will not be represented by Tapioca by adding these methods to relation classes.

See #2119 (comment) and #1994 (comment) for more information.