`validates_inclusion_of` and `validates_exclusion_of` now accept

`:within` option as alias of `:in` as documented.

Fix #7118

activemodel/lib/active_model/validations/clusivity.rb

@@ -7,7 +7,7 @@ module Clusivity #:nodoc:
                       "and must be supplied as the :in option of the configuration hash"
 
       def check_validity!
-        unless [:include?, :call].any?{ |method| options[:in].respond_to?(method) }
+        unless [:include?, :call].any?{ |method| range.respond_to?(method) }
           raise ArgumentError, ERROR_MESSAGE
         end
       end
@@ -15,11 +15,14 @@ def check_validity!
     private
 
       def include?(record, value)
-        delimiter = options[:in]
-        exclusions = delimiter.respond_to?(:call) ? delimiter.call(record) : delimiter
+        exclusions = range.respond_to?(:call) ? range.call(record) : range
         exclusions.send(inclusion_method(exclusions), value)
       end
 
+      def range
+        @range ||= options[:in] || options[:within]
+      end
+
       # In Ruby 1.9 <tt>Range#include?</tt> on non-numeric ranges checks all possible values in the
       # range for equality, so it may be slow for large ranges. The new <tt>Range#cover?</tt>
       # uses the previous logic of comparing a value with the range endpoints.

activemodel/test/cases/validations/exclusion_validation_test.rb

@@ -28,6 +28,16 @@ def test_validates_exclusion_of_with_formatted_message
     assert_equal ["option monkey is restricted"], t.errors[:title]
   end
 
+  def test_validates_exclusion_of_with_within_option
+    Topic.validates_exclusion_of( :title, :within => %w( abe monkey ) )
+
+    assert Topic.new("title" => "something", "content" => "abc")
+
+    t = Topic.new("title" => "monkey")
+    assert t.invalid?
+    assert t.errors[:title].any?
+  end
+
   def test_validates_exclusion_of_for_ruby_class
     Person.validates_exclusion_of :karma, :in => %w( abe monkey )
 

activemodel/test/cases/validations/inclusion_validation_test.rb

@@ -60,6 +60,16 @@ def test_validates_inclusion_of_with_formatted_message
     assert_equal ["option uhoh is not in the list"], t.errors[:title]
   end
 
+  def test_validates_inclusion_of_with_within_option
+    Topic.validates_inclusion_of( :title, :within => %w( a b c d e f g ) )
+
+    assert Topic.new("title" => "a", "content" => "abc").valid?
+
+    t = Topic.new("title" => "uhoh", "content" => "abc")
+    assert t.invalid?
+    assert t.errors[:title].any?
+  end
+
   def test_validates_inclusion_of_for_ruby_class
     Person.validates_inclusion_of :karma, :in => %w( abe monkey )