Merge pull request rails#51425 from andrewn617/revert-eliminate-lease-connection-in-type-caster-connection

Revert eliminate lease connection in type caster connection

Author: byroot

activerecord/lib/active_record/table_metadata.rb

@@ -44,7 +44,7 @@ def associated_table(table_name)
         arel_table = arel_table.alias(table_name) if arel_table.name != table_name
         TableMetadata.new(association_klass, arel_table, reflection)
       else
-        type_caster = TypeCaster::Connection.new(klass)
+        type_caster = TypeCaster::Connection.new(klass, table_name)
         arel_table = Arel::Table.new(table_name, type_caster: type_caster)
         TableMetadata.new(nil, arel_table, reflection)
       end

activerecord/lib/active_record/type_caster/connection.rb

@@ -3,8 +3,9 @@
 module ActiveRecord
   module TypeCaster
     class Connection # :nodoc:
-      def initialize(klass)
+      def initialize(klass, table_name)
         @klass = klass
+        @table_name = table_name
       end
 
       def type_cast_for_database(attr_name, value)
@@ -13,8 +14,20 @@ def type_cast_for_database(attr_name, value)
       end
 
       def type_for_attribute(attr_name)
-        @klass.type_for_attribute(attr_name) || Type.default_value
+        schema_cache = @klass.schema_cache
+
+        if schema_cache.data_source_exists?(table_name)
+          column = schema_cache.columns_hash(table_name)[attr_name.to_s]
+          if column
+            type = @klass.with_connection { |connection| connection.lookup_cast_type_from_column(column) }
+          end
+        end
+
+        type || Type.default_value
       end
+
+      private
+        attr_reader :table_name
     end
   end
 end