How to check if ActiveRecord inverse_of detection worked?

Question

According to the documentation for ActiveRecord::Associations::ClassMethods, ActiveRecord can automatically determine if a belongs_to association of one module is the inverse of a has_one or has_many association of another model.

However, I want to make sure that this detection actually succeeds on some associations I am not sure about (for instance, I have an belongs_to which doesn't exactly match the other model's name, but has class_name set). Is there a way to check that the inverse_of detection was applied to a specific association? Ideally, I would add something to the project's test suite to ensure that the association is bi-directional as intended.

Answer 1

Start a rails console, and run:

> Rails.application.eager_load!

> ActiveRecord::Base.descendants.each {|m| puts "=== #{m} ==="; m.reflect_on_all_associations.each {|a| puts "#{a.name} => #{a.has_inverse?}"}}

It will dump a list with all your models, their associations and if known their inverse, otherwise 'false', nil or an empty string (based on why it's unknown.)