Inspect all Models in a Rails application

Quick Tip:

Find all models in a project that include a certain method. Useful for some engine applications. When you don’t know what the parent application has you can do things like:

# if cache_classes is on - you need to do this 
# call first - otherwise you'll only get models
# that have been touched/initialized
Rails.application.eager_load!
    
models = ActiveRecord::Base.descendants
    
# find all models that have :users
models.select {|m| m.new.respond_to?(:users) }