add method Hints

do.go

@@ -7,6 +7,7 @@ import (
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
 	"gorm.io/gorm/schema"
+	"gorm.io/hints"
 
 	"gorm.io/gen/field"
 )
@@ -131,18 +132,22 @@ func (d *DO) Debug() Dao {
 	return NewDO(d.db.Debug())
 }
 
+func (d *DO) Hints(hs ...hints.Hints) Dao {
+	return NewDO(d.db.Clauses(hintToExpression(hs)...))
+}
+
 // As alias cannot be heired, As must used on tail
 func (d *DO) As(alias string) Dao {
 	return &DO{db: d.db, alias: alias}
 }
 
 // ======================== chainable api ========================
 func (d *DO) Not(conds ...Condition) Dao {
-	return NewDO(d.db.Clauses(clause.Where{Exprs: []clause.Expression{clause.Not(condToExpression(conds...)...)}}))
+	return NewDO(d.db.Clauses(clause.Where{Exprs: []clause.Expression{clause.Not(condToExpression(conds)...)}}))
 }
 
 func (d *DO) Or(conds ...Condition) Dao {
-	return NewDO(d.db.Clauses(clause.Where{Exprs: []clause.Expression{clause.Or(clause.And(condToExpression(conds...)...))}}))
+	return NewDO(d.db.Clauses(clause.Where{Exprs: []clause.Expression{clause.Or(clause.And(condToExpression(conds)...))}}))
 }
 
 func (d *DO) Select(columns ...field.Expr) Dao {
@@ -153,11 +158,11 @@ func (d *DO) Select(columns ...field.Expr) Dao {
 }
 
 func (d *DO) Where(conds ...Condition) Dao {
-	return NewDO(d.db.Clauses(clause.Where{Exprs: condToExpression(conds...)}))
+	return NewDO(d.db.Clauses(clause.Where{Exprs: condToExpression(conds)}))
 }
 
 func (d *DO) Order(columns ...field.Expr) Dao {
-	return NewDO(d.db.Clauses(clause.OrderBy{Expression: clause.CommaExpression{Exprs: toExpression(columns...)}}))
+	return NewDO(d.db.Clauses(clause.OrderBy{Expression: clause.CommaExpression{Exprs: toExpression(columns)}}))
 }
 
 func (d *DO) Distinct(columns ...field.Expr) Dao {
@@ -173,7 +178,7 @@ func (d *DO) Group(column field.Expr) Dao {
 }
 
 func (d *DO) Having(conds ...Condition) Dao {
-	return NewDO(d.db.Clauses(clause.GroupBy{Having: condToExpression(conds...)}))
+	return NewDO(d.db.Clauses(clause.GroupBy{Having: condToExpression(conds)}))
 }
 
 func (d *DO) Limit(limit int) Dao {
@@ -213,7 +218,7 @@ func (d *DO) join(table schema.Tabler, joinType clause.JoinType, conds ...Condit
 	from.Joins = append(from.Joins, clause.Join{
 		Type:  joinType,
 		Table: clause.Table{Name: table.TableName()},
-		ON:    clause.Where{Exprs: condToExpression(conds...)},
+		ON:    clause.Where{Exprs: condToExpression(conds)},
 	})
 	return NewDO(d.db.Clauses(from))
 }
@@ -247,31 +252,31 @@ func (d *DO) Save(value interface{}) error {
 }
 
 func (d *DO) First(dest interface{}, conds ...field.Expr) error {
-	return d.db.Clauses(toExpression(conds...)...).First(dest).Error
+	return d.db.Clauses(toExpression(conds)...).First(dest).Error
 }
 
 func (d *DO) Take(dest interface{}, conds ...field.Expr) error {
-	return d.db.Clauses(toExpression(conds...)...).Take(dest).Error
+	return d.db.Clauses(toExpression(conds)...).Take(dest).Error
 }
 
 func (d *DO) Last(dest interface{}, conds ...field.Expr) error {
-	return d.db.Clauses(toExpression(conds...)...).Last(dest).Error
+	return d.db.Clauses(toExpression(conds)...).Last(dest).Error
 }
 
 func (d *DO) Find(dest interface{}, conds ...field.Expr) error {
-	return d.db.Clauses(toExpression(conds...)...).Find(dest).Error
+	return d.db.Clauses(toExpression(conds)...).Find(dest).Error
 }
 
 func (d *DO) FindInBatches(dest interface{}, batchSize int, fc func(tx Dao, batch int) error) error {
 	return d.db.FindInBatches(dest, batchSize, func(tx *gorm.DB, batch int) error { return fc(NewDO(tx), batch) }).Error
 }
 
 func (d *DO) FirstOrInit(dest interface{}, conds ...field.Expr) error {
-	return d.db.Clauses(toExpression(conds...)...).FirstOrInit(dest).Error
+	return d.db.Clauses(toExpression(conds)...).FirstOrInit(dest).Error
 }
 
 func (d *DO) FirstOrCreate(dest interface{}, conds ...field.Expr) error {
-	return d.db.Clauses(toExpression(conds...)...).FirstOrCreate(dest).Error
+	return d.db.Clauses(toExpression(conds)...).FirstOrCreate(dest).Error
 }
 
 func (d *DO) Update(column field.Expr, value interface{}) error {
@@ -315,7 +320,7 @@ func (d *DO) UpdateColumns(values interface{}) error {
 }
 
 func (d *DO) Delete(value interface{}, conds ...field.Expr) error {
-	return d.db.Clauses(toExpression(conds...)...).Delete(value).Error
+	return d.db.Clauses(toExpression(conds)...).Delete(value).Error
 }
 
 func (d *DO) Count(count *int64) error {
@@ -366,15 +371,23 @@ func (d *DO) RollBackTo(name string) Dao {
 	return NewDO(d.db.RollbackTo(name))
 }
 
-func toExpression(conds ...field.Expr) []clause.Expression {
+func toExpression(conds []field.Expr) []clause.Expression {
 	exprs := make([]clause.Expression, len(conds))
 	for i, cond := range conds {
 		exprs[i] = cond
 	}
 	return exprs
 }
 
-func condToExpression(conds ...Condition) []clause.Expression {
+func hintToExpression(hs []hints.Hints) []clause.Expression {
+	exprs := make([]clause.Expression, len(hs))
+	for i, hint := range hs {
+		exprs[i] = hint
+	}
+	return exprs
+}
+
+func condToExpression(conds []Condition) []clause.Expression {
 	exprs := make([]clause.Expression, 0, len(conds))
 	for _, cond := range conds {
 		switch cond := cond.(type) {

go.mod

@@ -6,4 +6,5 @@ require (
 	golang.org/x/tools v0.1.5
 	gorm.io/driver/mysql v1.1.1
 	gorm.io/gorm v1.21.13
+	gorm.io/hints v0.0.0-20210809061251-a20b3c9afa2b
 )

go.sum

@@ -2,8 +2,11 @@ github.com/go-sql-driver/mysql v1.6.0 h1:BCTh4TKNUYmOmMUcQ3IipzF5prigylS7XXjEkfC
 github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
 github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
 github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
 github.com/jinzhu/now v1.1.2 h1:eVKgfIdy9b6zbWBMgFpfDPoAMifwSZagU9HmEU6zgiI=
 github.com/jinzhu/now v1.1.2/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/mattn/go-sqlite3 v1.14.5 h1:1IdxlwTNazvbKJQSxoJ5/9ECbEeaTTyeU7sEAZ5KKTQ=
+github.com/mattn/go-sqlite3 v1.14.5/go.mod h1:WVKg1VTActs4Qso6iwGbiFih2UIHo0ENGwNd0Lj+XmI=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
@@ -33,6 +36,12 @@ golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1N
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gorm.io/driver/mysql v1.1.1 h1:yr1bpyqiwuSPJ4aGGUX9nu46RHXlF8RASQVb1QQNcvo=
 gorm.io/driver/mysql v1.1.1/go.mod h1:KdrTanmfLPPyAOeYGyG+UpDys7/7eeWT1zCq+oekYnU=
+gorm.io/driver/sqlite v1.1.4 h1:PDzwYE+sI6De2+mxAneV9Xs11+ZyKV6oxD3wDGkaNvM=
+gorm.io/driver/sqlite v1.1.4/go.mod h1:mJCeTFr7+crvS+TRnWc5Z3UvwxUN1BGBLMrf5LA9DYw=
+gorm.io/gorm v1.20.7/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
 gorm.io/gorm v1.21.9/go.mod h1:F+OptMscr0P2F2qU97WT1WimdH9GaQPoDW7AYd5i2Y0=
+gorm.io/gorm v1.21.12/go.mod h1:F+OptMscr0P2F2qU97WT1WimdH9GaQPoDW7AYd5i2Y0=
 gorm.io/gorm v1.21.13 h1:JU5A4yVemRjdMndJ0oZU7VX+Nr2ICE3C60U5bgR6mHE=
 gorm.io/gorm v1.21.13/go.mod h1:F+OptMscr0P2F2qU97WT1WimdH9GaQPoDW7AYd5i2Y0=
+gorm.io/hints v0.0.0-20210809061251-a20b3c9afa2b h1:asIGciWLhbjgrMwbN+3e+Bwom41q430iGSTyZCY4qz8=
+gorm.io/hints v0.0.0-20210809061251-a20b3c9afa2b/go.mod h1:maPPgx/jalkq7ejIv2F0UmOkz9h/9Caj9nKeoLOzzjE=