Moved a few methods from RecordIdentifier to ActiveModel::Naming

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

2 files changed, 92 insertions, 0 deletions

diff --git a/activemodel/lib/active_model/naming.rb b/activemodel/lib/active_model/naming.rb
index ca1e9f0ee8..dc83932dde 100644
--- a/activemodel/lib/active_model/naming.rb
+++ b/activemodel/lib/active_model/naming.rb
@@ -57,6 +57,35 @@ module ActiveModel
     def model_name
       @_model_name ||= ActiveModel::Name.new(self)
     end
+
+    # Returns the plural class name of a record or class. Examples:
+    #
+    #   ActiveModel::Naming.plural(post)             # => "posts"
+    #   ActiveModel::Naming.plural(Highrise::Person) # => "highrise_people"
+    def self.plural(record_or_class)
+      model_name_from_record_or_class(record_or_class).plural
+    end
+
+    # Returns the singular class name of a record or class. Examples:
+    #
+    #   ActiveModel::Naming.singular(post)             # => "post"
+    #   ActiveModel::Naming.singular(Highrise::Person) # => "highrise_person"
+    def self.singular(record_or_class)
+      model_name_from_record_or_class(record_or_class).singular
+    end
+
+    # Identifies whether the class name of a record or class is uncountable. Examples:
+    #
+    #   ActiveModel::Naming.uncountable?(Sheep) # => true
+    #   ActiveModel::Naming.uncountable?(Post) => false
+    def self.uncountable?(record_or_class)
+      plural(record_or_class) == singular(record_or_class)
+    end
+
+    private
+      def self.model_name_from_record_or_class(record_or_class)
+        (record_or_class.is_a?(Class) ? record_or_class : record_or_class.class).model_name
+      end
   end
   
 end
diff --git a/activemodel/test/cases/naming_helpers_test.rb b/activemodel/test/cases/naming_helpers_test.rb
new file mode 100644
index 0000000000..e7234e009e
--- /dev/null
+++ b/activemodel/test/cases/naming_helpers_test.rb
@@ -0,0 +1,63 @@
+require 'cases/helper'
+
+class Comment
+  extend ActiveModel::Naming
+  include ActiveModel::Conversion
+
+  attr_reader :id
+  def to_key; id ? [id] : nil end
+  def save; @id = 1 end
+  def new_record?; @id.nil? end
+  def name
+    @id.nil? ? 'new comment' : "comment ##{@id}"
+  end
+end
+
+class Sheep
+  extend ActiveModel::Naming
+  include ActiveModel::Conversion
+
+  attr_reader :id
+  def to_key; id ? [id] : nil end
+  def save; @id = 1 end
+  def new_record?; @id.nil? end
+  def name
+    @id.nil? ? 'new sheep' : "sheep ##{@id}"
+  end
+end
+
+class NamingHelpersTest < Test::Unit::TestCase
+  def setup
+    @klass  = Comment
+    @record = @klass.new
+    @singular = 'comment'
+    @plural = 'comments'
+    @uncountable = Sheep
+  end
+
+  def test_singular
+    assert_equal @singular, singular(@record)
+  end
+
+  def test_singular_for_class
+    assert_equal @singular, singular(@klass)
+  end
+
+  def test_plural
+    assert_equal @plural, plural(@record)
+  end
+
+  def test_plural_for_class
+    assert_equal @plural, plural(@klass)
+  end
+
+  def test_uncountable
+    assert_equal true, uncountable?(@uncountable)
+    assert_equal false, uncountable?(@klass)
+  end
+
+  private
+    def method_missing(method, *args)
+      ActiveModel::Naming.send(method, *args)
+    end
+end