include names in model generator warning message. refs #13515.

This is a follow up to #13515. It includes the name given and
the singularized version in the warning message. This will aide the user
to see wether the detected singular was right or not.

railties/lib/rails/generators/model_helpers.rb

@@ -3,21 +3,23 @@
 module Rails
   module Generators
     module ModelHelpers # :nodoc:
-      PLURAL_MODEL_NAME_WARN_MESSAGE = 'Plural version of the model detected, using singularized version. Override with --force-plural or setup custom inflection rules for this noun before running the generator.'
+      PLURAL_MODEL_NAME_WARN_MESSAGE = "The model name '%s' was recognized as a plural, using the singular '%s'. " \
+                                       "Override with --force-plural or setup custom inflection rules for this noun before running the generator."
       mattr_accessor :skip_warn
 
       def self.included(base) #:nodoc:
-        base.class_option :force_plural, type: :boolean, default: false, desc: 'Forces the use of a plural model name'
+        base.class_option :force_plural, type: :boolean, default: false, desc: 'Forces the use of the given model name'
       end
 
       def initialize(args, *_options)
         super
         if name == name.pluralize && name.singularize != name.pluralize && !options[:force_plural]
+          singular = name.singularize
           unless ModelHelpers.skip_warn
-            say PLURAL_MODEL_NAME_WARN_MESSAGE
+            say PLURAL_MODEL_NAME_WARN_MESSAGE % [name, singular]
             ModelHelpers.skip_warn = true
           end
-          name.replace name.singularize
+          name.replace singular
           assign_names!(name)
         end
       end

railties/test/generators/model_generator_test.rb

@@ -38,7 +38,7 @@ def test_plural_names_are_singularized
     content = run_generator ["accounts".freeze]
     assert_file "app/models/account.rb", /class Account < ActiveRecord::Base/
     assert_file "test/models/account_test.rb", /class AccountTest/
-    assert_match(/Plural version of the model detected, using singularized version. Override with --force-plural or setup custom inflection rules for this noun before running the generator./, content)
+    assert_match(/The model name 'accounts' was recognized as a plural, using the singular 'account'\. Override with --force-plural or setup custom inflection rules for this noun before running the generator\./, content)
   end
 
   def test_model_with_underscored_parent_option