Patch #schema_cache on AR directly to make it work

lib/active_type/no_table.rb

@@ -126,12 +126,38 @@ def initialize(*)
 
       end
 
+      class DummyConnectionPool < ActiveRecord::ConnectionAdapters::NullPool
+
+        attr_reader :schema_cache
+
+        def initialize(*)
+          super
+          @schema_cache = DummySchemaCache.new
+          @connection = DummyConnection.new(nil)
+        end
+
+        def with_connection(**)
+          yield(@connection)
+        end
+
+        def active_connection
+          @connection
+        end
+
+      end
+
       module ClassMethods
 
         def connection
           @connection ||= DummyConnection.new(nil)
         end
 
+        if ActiveRecord::Base.respond_to?(:connection_pool)
+          def connection_pool
+            @connection_pool ||= DummyConnectionPool.new
+          end
+        end
+
         def destroy(*)
           new
         end
@@ -147,7 +173,6 @@ def find_by_sql(*)
         def _query_by_sql(*)
           []
         end
-
       end
 
       def destroy