Generate module file for namespaced models [#4230 state:resolved]

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

activerecord/lib/rails/generators/active_record/model/model_generator.rb

@@ -20,6 +20,11 @@ def create_model_file
         template 'model.rb', File.join('app/models', class_path, "#{file_name}.rb")
       end
 
+      def create_module_file
+        return if class_path.empty?
+        template 'module.rb', File.join('app/models', "#{class_path.join('/')}.rb")
+      end
+
       hook_for :test_framework
 
       protected

activerecord/lib/rails/generators/active_record/model/templates/module.rb

+module <%= class_path.map(&:camelize).join('::') %>
+  def self.table_name_prefix
+    '<%= class_path.join('_') %>_'
+  end
+end

railties/lib/rails/generators/rails/model/USAGE

@@ -15,6 +15,10 @@ Description:
     Finally, if --parent option is given, it's used as superclass of the
     created model. This allows you create Single Table Inheritance models.
 
+    If you pass a namespaced model name (e.g. admin/account or Admin::Account)
+    then the generator will create a module with a table_name_prefix method
+    to prefix the model's table name with the module name (e.g. admin_account)
+
 Examples:
     `rails generate model account`
 
@@ -28,3 +32,14 @@ Examples:
     `rails generate model post title:string body:text published:boolean`
 
         Creates a Post model with a string title, text body, and published flag.
+
+    `rails generate model admin/account`
+
+        For ActiveRecord and TestUnit it creates:
+
+            Module:     app/models/admin.rb
+            Model:      app/models/admin/account.rb
+            Test:       test/unit/admin/account_test.rb
+            Fixtures:   test/fixtures/admin_accounts.yml
+            Migration:  db/migrate/XXX_add_admin_accounts.rb
+

railties/test/generators/model_generator_test.rb

@@ -27,6 +27,14 @@ def test_model_with_underscored_parent_option
     assert_file "app/models/account.rb", /class Account < Admin::Account/
   end
 
+  def test_model_with_namespace
+    run_generator ["admin/account"]
+    assert_file "app/models/admin.rb", /module Admin/
+    assert_file "app/models/admin.rb", /def self\.table_name_prefix/
+    assert_file "app/models/admin.rb", /'admin_'/
+    assert_file "app/models/admin/account.rb", /class Admin::Account < ActiveRecord::Base/
+  end
+
   def test_migration
     run_generator
     assert_migration "db/migrate/create_accounts.rb", /class CreateAccounts < ActiveRecord::Migration/