all columns respond to string_to_binary, so no need to check respond_to?

activerecord/lib/active_record/connection_adapters/abstract/quoting.rb

@@ -14,8 +14,8 @@ def quote(value, column = nil)
           value = value.to_s
           return "'#{quote_string(value)}'" unless column
 
-          if column.type == :binary && column.class.respond_to?(:string_to_binary)
-            "'#{quote_string(column.class.string_to_binary(value))}'" # ' (for ruby-mode)
+          if column.type == :binary
+            "'#{quote_string(column.string_to_binary(value))}'" # ' (for ruby-mode)
           elsif [:integer, :float].include?(column.type)
             (column.type == :integer ? value.to_i : value.to_f).to_s
           else

activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb

@@ -114,6 +114,11 @@ def extract_default(default)
         type_cast(default)
       end
 
+      # Used to convert from Strings to BLOBs
+      def string_to_binary(value)
+        self.class.string_to_binary(value)
+      end
+
       class << self
         # Used to convert from Strings to BLOBs
         def string_to_binary(value)
@@ -268,6 +273,10 @@ class IndexDefinition < Struct.new(:table, :name, :unique, :columns, :lengths) #
     # for generating a number of table creation or table changing SQL statements.
     class ColumnDefinition < Struct.new(:base, :name, :type, :limit, :precision, :scale, :default, :null) #:nodoc:
 
+      def string_to_binary(value)
+        value
+      end
+
       def sql_type
         base.type_to_sql(type.to_sym, limit, precision, scale) rescue type
       end

activerecord/test/cases/quoting_test.rb

@@ -3,7 +3,12 @@
 module ActiveRecord
   module ConnectionAdapters
     class QuotingTest < ActiveRecord::TestCase
-      class FakeColumn < Struct.new(:type)
+      class FakeColumn < ActiveRecord::ConnectionAdapters::Column
+        attr_accessor :type
+
+        def initialize type
+          @type = type
+        end
       end
 
       def setup
@@ -190,7 +195,7 @@ def test_quote_binary_without_string_to_binary
 
       def test_quote_binary_with_string_to_binary
         col = Class.new(FakeColumn) {
-          def self.string_to_binary(value)
+          def string_to_binary(value)
             'foo'
           end
         }.new(:binary)
@@ -199,7 +204,7 @@ def self.string_to_binary(value)
 
       def test_quote_as_mb_chars_binary_column_with_string_to_binary
         col = Class.new(FakeColumn) {
-          def self.string_to_binary(value)
+          def string_to_binary(value)
             'foo'
           end
         }.new(:binary)