Move sequence value methods to Model level

activerecord/lib/active_record/model_schema.rb

@@ -231,6 +231,18 @@ def sequence_name=(value)
         @explicit_sequence_name = true
       end
 
+      # Determines if the primary key values should be selected from their
+      # corresponding sequence before the insert statement.
+      def prefetch_primary_key?
+        connection.prefetch_primary_key?(table_name)
+      end
+
+      # Returns the next value that will be used as the primary key on
+      # an insert statment.
+      def next_sequence_value
+        connection.next_sequence_value(sequence_name)
+      end
+
       # Indicates whether the table associated with this class exists
       def table_exists?
         connection.schema_cache.data_source_exists?(table_name)

activerecord/lib/active_record/relation.rb

@@ -45,8 +45,8 @@ def insert(values) # :nodoc:
           k.name == primary_key
         }]
 
-        if !primary_key_value && connection.prefetch_primary_key?(klass.table_name)
-          primary_key_value = connection.next_sequence_value(klass.sequence_name)
+        if !primary_key_value && klass.prefetch_primary_key?
+          primary_key_value = klass.next_sequence_value
           values[arel_attribute(klass.primary_key)] = primary_key_value
         end
       end