Fix error for chain query

README.md

@@ -3,8 +3,9 @@
 Yet Another ORM library for Go, aims for developer friendly
 
 ## TODO
-* Soft Delete
 * Better First method (First(&user, primary_key, where conditions))
+* Update, Updates
+* Soft Delete
 * Even more complex where query (with map or struct)
 * FindOrInitialize / FindOrCreate
 * SQL Log

orm.go

@@ -36,6 +36,12 @@ func (s *Orm) err(err error) {
 	}
 }
 
+func (s *Orm) Copy() *Orm {
+	c := *s
+	c.SqlVars = c.SqlVars[:0]
+	return &c
+}
+
 func (s *Orm) Model(model interface{}) *Orm {
 	s.model = s.toModel(model)
 	s.TableName = s.model.TableName()
@@ -114,12 +120,12 @@ func (s *Orm) Save(value interface{}) *Orm {
 	} else {
 		s.update(value)
 	}
-	return s
+	return s.Copy()
 }
 
 func (s *Orm) Delete(value interface{}) *Orm {
 	s.explain(value, "Delete").delete(value)
-	return s
+	return s.Copy()
 }
 
 func (s *Orm) Update(column string, value string) *Orm {
@@ -138,22 +144,22 @@ func (s *Orm) Exec(sql ...string) *Orm {
 		s.SqlResult, err = s.db.Exec(sql[0])
 	}
 	s.err(err)
-	return s
+	return s.Copy()
 }
 
 func (s *Orm) First(out interface{}) *Orm {
 	s.explain(out, "Query").query(out)
-	return s
+	return s.Copy()
 }
 
 func (s *Orm) Find(out interface{}) *Orm {
 	s.explain(out, "Query").query(out)
-	return s
+	return s.Copy()
 }
 
 func (s *Orm) Pluck(column string, value interface{}) (orm *Orm) {
 	s.Select(column).explain(s.model.Data, "Query").pluck(value)
-	return s
+	return s.Copy()
 }
 
 func (s *Orm) Or(querystring interface{}, args ...interface{}) *Orm {

orm_test.go

@@ -61,6 +61,11 @@ func init() {
 	db.Save(&User{Name: "5", Age: 26, Birthday: t4})
 }
 
+func TestFirst(t *testing.T) {
+	var u1, u2 User
+	db.Where("name = ?", "3").Order("age desc").First(&u1).First(&u2)
+}
+
 func TestSaveAndFind(t *testing.T) {
 	name := "save_and_find"
 	u := &User{Name: name, Age: 1}