1 files changed, 48 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/type/decimal.rb b/activerecord/lib/active_record/type/decimal.rb
new file mode 100644
index 0000000000..7b2bee2c42
--- /dev/null
+++ b/activerecord/lib/active_record/type/decimal.rb
@@ -0,0 +1,48 @@
+module ActiveRecord
+  module Type
+    class Decimal < Value # :nodoc:
+      include Numeric
+
+      def type
+        :decimal
+      end
+
+      def type_cast_for_schema(value)
+        value.to_s
+      end
+
+      private
+
+      def cast_value(value)
+        case value
+        when ::Float
+          convert_float_to_big_decimal(value)
+        when ::Numeric, ::String
+          BigDecimal(value, precision.to_i)
+        else
+          if value.respond_to?(:to_d)
+            value.to_d
+          else
+            cast_value(value.to_s)
+          end
+        end
+      end
+
+      def convert_float_to_big_decimal(value)
+        if precision
+          BigDecimal(value, float_precision)
+        else
+          value.to_d
+        end
+      end
+
+      def float_precision
+        if precision.to_i > ::Float::DIG + 1
+          ::Float::DIG + 1
+        else
+          precision.to_i
+        end
+      end
+    end
+  end
+end