Remove deprecated ActiveSupport::JSON::Encoding::CircularReferenceError.

activesupport/CHANGELOG.md

+*   Remove deprecated `ActiveSupport::JSON::Encoding::CircularReferenceError`.
+
+    *Rafael Mendonça França*
+
 *   Remove deprecated methods `ActiveSupport::JSON::Encoding.encode_big_decimal_as_string=`
     and `ActiveSupport::JSON::Encoding.encode_big_decimal_as_string`.
 

activesupport/lib/active_support/json/encoding.rb

@@ -112,28 +112,6 @@ class << self
         # Sets the encoder used by Rails to encode Ruby objects into JSON strings
         # in +Object#to_json+ and +ActiveSupport::JSON.encode+.
         attr_accessor :json_encoder
-
-        # Deprecate CircularReferenceError
-        def const_missing(name)
-          if name == :CircularReferenceError
-            message = "The JSON encoder in Rails 4.1 no longer offers protection from circular references. " \
-                      "You are seeing this warning because you are rescuing from (or otherwise referencing) " \
-                      "ActiveSupport::Encoding::CircularReferenceError. In the future, this error will be " \
-                      "removed from Rails. You should remove these rescue blocks from your code and ensure " \
-                      "that your data structures are free of circular references so they can be properly " \
-                      "serialized into JSON.\n\n" \
-                      "For example, the following Hash contains a circular reference to itself:\n" \
-                      "   h = {}\n" \
-                      "   h['circular'] = h\n" \
-                      "In this case, calling h.to_json would not work properly."
-
-            ActiveSupport::Deprecation.warn message
-
-            SystemStackError
-          else
-            super
-          end
-        end
       end
 
       self.use_standard_json_time_format = true

activesupport/test/json/encoding_test.rb

@@ -176,30 +176,6 @@ def test_wide_utf8_roundtrip
     assert_equal "𐒑", decoded_hash['string']
   end
 
-  def test_exception_raised_when_encoding_circular_reference_in_array
-    a = [1]
-    a << a
-    assert_deprecated do
-      assert_raise(ActiveSupport::JSON::Encoding::CircularReferenceError) { ActiveSupport::JSON.encode(a) }
-    end
-  end
-
-  def test_exception_raised_when_encoding_circular_reference_in_hash
-    a = { :name => 'foo' }
-    a[:next] = a
-    assert_deprecated do
-      assert_raise(ActiveSupport::JSON::Encoding::CircularReferenceError) { ActiveSupport::JSON.encode(a) }
-    end
-  end
-
-  def test_exception_raised_when_encoding_circular_reference_in_hash_inside_array
-    a = { :name => 'foo', :sub => [] }
-    a[:sub] << a
-    assert_deprecated do
-      assert_raise(ActiveSupport::JSON::Encoding::CircularReferenceError) { ActiveSupport::JSON.encode(a) }
-    end
-  end
-
   def test_hash_key_identifiers_are_always_quoted
     values = {0 => 0, 1 => 1, :_ => :_, "$" => "$", "a" => "a", :A => :A, :A0 => :A0, "A0B" => "A0B"}
     assert_equal %w( "$" "A" "A0" "A0B" "_" "a" "0" "1" ).sort, object_keys(ActiveSupport::JSON.encode(values))