Change class evaluation for Rationals in cast_value

1 files changed, 6 insertions, 4 deletions

diff --git a/activerecord/lib/active_record/type/decimal.rb b/activerecord/lib/active_record/type/decimal.rb
index 33d4e37ea3..1c7edc12f5 100644
--- a/activerecord/lib/active_record/type/decimal.rb
+++ b/activerecord/lib/active_record/type/decimal.rb
@@ -14,14 +14,16 @@ module ActiveRecord
       private
 
       def cast_value(value)
-        if value.class == Rational
-          BigDecimal.new(value, precision.to_i)
-        elsif value.respond_to?(:to_d)
+        case value
+        when Numeric, String, Rational
+          BigDecimal(value, precision.to_i)
+        when proc { value.respond_to?(:to_d) }
           value.to_d
         else
-          value.to_s.to_d
+          cast_value(value.to_s)
         end
       end
+
     end
   end
 end