Move model naming into ActiveModel

3 files changed, 54 insertions, 0 deletions

diff --git a/activemodel/lib/active_model.rb b/activemodel/lib/active_model.rb
index 73cee9b88f..f8e5725e9c 100644
--- a/activemodel/lib/active_model.rb
+++ b/activemodel/lib/active_model.rb
@@ -29,6 +29,8 @@ module ActiveModel
   autoload :Base, 'active_model/base'
   autoload :DeprecatedErrorMethods, 'active_model/deprecated_error_methods'
   autoload :Errors, 'active_model/errors'
+  autoload :Name, 'active_model/naming'
+  autoload :Naming, 'active_model/naming'
   autoload :Observer, 'active_model/observing'
   autoload :Observing, 'active_model/observing'
   autoload :StateMachine, 'active_model/state_machine'
diff --git a/activemodel/lib/active_model/naming.rb b/activemodel/lib/active_model/naming.rb
new file mode 100644
index 0000000000..ffb44e3824
--- /dev/null
+++ b/activemodel/lib/active_model/naming.rb
@@ -0,0 +1,25 @@
+require 'active_support/inflector'
+
+module ActiveModel
+  class Name < String
+    attr_reader :singular, :plural, :element, :collection, :partial_path
+    alias_method :cache_key, :collection
+
+    def initialize(name)
+      super
+      @singular = ActiveSupport::Inflector.underscore(self).tr('/', '_').freeze
+      @plural = ActiveSupport::Inflector.pluralize(@singular).freeze
+      @element = ActiveSupport::Inflector.underscore(ActiveSupport::Inflector.demodulize(self)).freeze
+      @collection = ActiveSupport::Inflector.tableize(self).freeze
+      @partial_path = "#{@collection}/#{@element}".freeze
+    end
+  end
+
+  module Naming
+    # Returns an ActiveModel::Name object for module. It can be
+    # used to retrieve all kinds of naming-related information.
+    def model_name
+      @_model_name ||= ActiveModel::Name.new(name)
+    end
+  end
+end
diff --git a/activemodel/test/cases/naming_test.rb b/activemodel/test/cases/naming_test.rb
new file mode 100644
index 0000000000..e75d4541a3
--- /dev/null
+++ b/activemodel/test/cases/naming_test.rb
@@ -0,0 +1,27 @@
+require 'cases/helper'
+
+class NamingTest < Test::Unit::TestCase
+  def setup
+    @model_name = ActiveModel::Name.new('Post::TrackBack')
+  end
+
+  def test_singular
+    assert_equal 'post_track_back', @model_name.singular
+  end
+
+  def test_plural
+    assert_equal 'post_track_backs', @model_name.plural
+  end
+
+  def test_element
+    assert_equal 'track_back', @model_name.element
+  end
+
+  def test_collection
+    assert_equal 'post/track_backs', @model_name.collection
+  end
+
+  def test_partial_path
+    assert_equal 'post/track_backs/track_back', @model_name.partial_path
+  end
+end