Use the generic type map object for mysql field lookups

1 files changed, 15 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/type/hash_lookup_type_map.rb b/activerecord/lib/active_record/connection_adapters/type/hash_lookup_type_map.rb
new file mode 100644
index 0000000000..828ada00a7
--- /dev/null
+++ b/activerecord/lib/active_record/connection_adapters/type/hash_lookup_type_map.rb
@@ -0,0 +1,15 @@
+module ActiveRecord
+  module ConnectionAdapters
+    module Type
+      class HashLookupTypeMap < TypeMap # :nodoc:
+        def lookup(type)
+          @mapping.fetch(type, proc { default_value }).call(type)
+        end
+
+        def alias_type(type, alias_type)
+          register_type(type) { lookup(alias_type) }
+        end
+      end
+    end
+  end
+end