invoke_fallbacks_for

# File railties/lib/rails/generators.rb, line 286
        def invoke_fallbacks_for(name, base)
          return nil unless base && fallbacks[base.to_sym]
          invoked_fallbacks = []

          Array(fallbacks[base.to_sym]).each do |fallback|
            next if invoked_fallbacks.include?(fallback)
            invoked_fallbacks << fallback

            klass = find_by_namespace(name, fallback)
            return klass if klass
          end

          nil
        end