1 files changed, 5 insertions, 6 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
index a90e9a4b71..617d131c40 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -435,7 +435,11 @@ module ActiveRecord
         # Extract the table from the insert sql. Yuck.
         table = sql.split(" ", 4)[2].gsub('"', '')
 
-        pk, sequence_name = *pk_and_sequence_for(table) unless pk
+        # If neither pk nor sequence name is given, look them up.
+        unless pk || sequence_name
+          pk, sequence_name = *pk_and_sequence_for(table)
+        end
+
         if pk
           id = select_value("#{sql} RETURNING #{quote_column_name(pk)}")
           return id
@@ -443,11 +447,6 @@ module ActiveRecord
 
         super
 
-        # If neither pk nor sequence name is given, look them up.
-        unless pk || sequence_name
-          pk, sequence_name = *pk_and_sequence_for(table)
-        end
-
         # If a pk is given, fallback to default sequence name.
         # Don't fetch last insert id for a table without a pk.
         if pk && sequence_name ||= default_sequence_name(table, pk)