Better shortcut options for custom validators [#5672 state:resolved]

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

activemodel/lib/active_model/validations/validates.rb

@@ -55,14 +55,19 @@ module ActiveModel
       #     validates :name, :title => true
       #   end
       #
-      # The validators hash can also handle regular expressions, ranges and arrays:
+      # The validators hash can also handle regular expressions, ranges, 
+      # arrays and strings in shortcut form, e.g.
       #
       #   validates :email, :format => /@/
       #   validates :gender, :inclusion => %w(male female)
       #   validates :password, :length => 6..20
       #
-      # Finally, the options :if, :unless, :on, :allow_blank and :allow_nil can be given
-      # to one specific validator:
+      # When using shortcut form, ranges and arrays are passed to your
+      # validator's initializer as +options[:in]+ while other types including
+      # regular expressions and strings are passed as +options[:with]+
+      #
+      # Finally, the options +:if+, +:unless+, +:on+, +:allow_blank+ and +:allow_nil+ can be given
+      # to one specific validator, as a hash:
       #
       #   validates :password, :presence => { :if => :password_required? }, :confirmation => true
       #
@@ -99,10 +104,10 @@ module ActiveModel
           {}
         when Hash
           options
-        when Regexp
-          { :with => options }
         when Range, Array
           { :in => options }
+        else
+          { :with => options }
         end
       end
     end

activemodel/test/cases/validations/validates_test.rb

@@ -111,4 +111,13 @@ class ValidatesTest < ActiveModel::TestCase
     person.valid?
     assert_equal ['Local validator please'], person.errors[:title]
   end
+
+  def test_validates_with_included_validator_and_wildcard_shortcut
+    # Shortcut for PersonWithValidator.validates :title, :like => { :with => "Mr." }
+    PersonWithValidator.validates :title, :like => "Mr."
+    person = PersonWithValidator.new
+    person.title = "Ms. Pacman"
+    person.valid?
+    assert_equal ['does not appear to be like Mr.'], person.errors[:title]
+  end
 end

activemodel/test/models/person_with_validator.rb

@@ -7,5 +7,18 @@ class PersonWithValidator
     end
   end
 
+  class LikeValidator < ActiveModel::EachValidator
+    def initialize(options)
+      @with = options[:with]
+      super
+    end
+
+    def validate_each(record, attribute, value)
+      unless value[@with]
+        record.errors.add attribute, "does not appear to be like #{@with}"
+      end
+    end
+  end
+
   attr_accessor :title, :karma
 end