fix: FirstOrCreate RowsAffected (#5250)

finisher_api.go

@@ -326,6 +326,9 @@ func (db *DB) FirstOrCreate(dest interface{}, conds ...interface{}) (tx *DB) {
 			}
 
 			return tx.Model(dest).Updates(assigns)
+		} else {
+			// can not use Find RowsAffected
+			tx.RowsAffected = 0
 		}
 	}
 	return tx

tests/create_test.go

@@ -526,3 +526,17 @@ func TestCreateNilPointer(t *testing.T) {
 		t.Fatalf("it is not ErrInvalidValue")
 	}
 }
+
+func TestFirstOrCreateRowsAffected(t *testing.T) {
+	user := User{Name: "TestFirstOrCreateRowsAffected"}
+
+	res := DB.FirstOrCreate(&user, "name = ?", user.Name)
+	if res.Error != nil || res.RowsAffected != 1 {
+		t.Fatalf("first or create rows affect err:%v rows:%d", res.Error, res.RowsAffected)
+	}
+
+	res = DB.FirstOrCreate(&user, "name = ?", user.Name)
+	if res.Error != nil || res.RowsAffected != 0 {
+		t.Fatalf("first or create rows affect err:%v rows:%d", res.Error, res.RowsAffected)
+	}
+}