Sorbet-rails not generating RBI's for rails has_many, belongs_to, etc

Question

Maybe there's something in the initialization process that I missed, but sorbet-rails seems to having trouble generating methods for some of the default rails methods (eg has_many , belongs_to , validates , etc.). I can see that the corresponding generated association is generated, but I get type complaints that the main methods do not exist.

eg a class like this:

class Role < ApplicationRecord
  has_and_belongs_to_many :users, :join_table => :users_roles

I can see the auto generated sigil in role.rbi

  sig { returns(::User::ActiveRecord_Associations_CollectionProxy) }
  def users; end

However this is the error I get when checking types:

Method has_and_belongs_to_many does not exist on T.class_of(Role) https://srb.help/7003
     3 |  has_and_belongs_to_many :users, :join_table => :users_roles
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Answer 1

This error is an error with sorbet not knowing that has_and_belongs_to_many method exists. Usually this is provided by sorbet itself. I can see the signature of this method is defined in sorbet-typed's activerecord.rbi . In your repo it should be under this path:

sorbet/rbi/sorbet-typed/lib/activerecord/all/activerecord.rbi

Can you check if the file exists in your repo? if not, you could try running srb rbi sorbet-typed (following the rbi files doc )

Method has_and_belongs_to_many does not exist on T.class_of(Role) https://srb.help/7003
     3 |  has_and_belongs_to_many :users, :join_table => :users_roles
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^