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Proposal, Add Specific on for Joins queries

This commit is contained in:
Adrien Carreira 2021-07-08 10:04:40 +02:00 committed by Jinzhu
parent eaa63d15e7
commit 895c1178a0
3 changed files with 34 additions and 20 deletions
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47
callbacks/query.go
View File

@ -125,33 +125,40 @@ func BuildQuerySQL(db *gorm.DB) {
})
}
exprs := make([]clause.Expression, len(relation.References))
for idx, ref := range relation.References {
if ref.OwnPrimaryKey {
exprs[idx] = clause.Eq{
Column: clause.Column{Table: clause.CurrentTable, Name: ref.PrimaryKey.DBName},
Value: clause.Column{Table: tableAliasName, Name: ref.ForeignKey.DBName},
}
} else {
if ref.PrimaryValue == "" {
if join.On != nil {
exprs := make([]clause.Expression, len(relation.References))
for idx, ref := range relation.References {
if ref.OwnPrimaryKey {
exprs[idx] = clause.Eq{
Column: clause.Column{Table: clause.CurrentTable, Name: ref.ForeignKey.DBName},
Value: clause.Column{Table: tableAliasName, Name: ref.PrimaryKey.DBName},
Column: clause.Column{Table: clause.CurrentTable, Name: ref.PrimaryKey.DBName},
Value: clause.Column{Table: tableAliasName, Name: ref.ForeignKey.DBName},
}
} else {
exprs[idx] = clause.Eq{
Column: clause.Column{Table: tableAliasName, Name: ref.ForeignKey.DBName},
Value: ref.PrimaryValue,
if ref.PrimaryValue == "" {
exprs[idx] = clause.Eq{
Column: clause.Column{Table: clause.CurrentTable, Name: ref.ForeignKey.DBName},
Value: clause.Column{Table: tableAliasName, Name: ref.PrimaryKey.DBName},
}
} else {
exprs[idx] = clause.Eq{
Column: clause.Column{Table: tableAliasName, Name: ref.ForeignKey.DBName},
Value: ref.PrimaryValue,
}
}
}
}
joins = append(joins, clause.Join{
Type: clause.LeftJoin,
Table: clause.Table{Name: relation.FieldSchema.Table, Alias: tableAliasName},
ON: clause.Where{Exprs: exprs},
})
} else {
joins = append(joins, clause.Join{
Type: clause.LeftJoin,
Table: clause.Table{Name: relation.FieldSchema.Table, Alias: tableAliasName},
ON: clause.Where{Exprs: []clause.Expression{join.On}},
})
}
joins = append(joins, clause.Join{
Type: clause.LeftJoin,
Table: clause.Table{Name: relation.FieldSchema.Table, Alias: tableAliasName},
ON: clause.Where{Exprs: exprs},
})
} else {
joins = append(joins, clause.Join{
Expression: clause.NamedExpr{SQL: join.Name, Vars: join.Conds},

6
chainable_api.go
View File

@ -177,6 +177,12 @@ func (db *DB) Joins(query string, args ...interface{}) (tx *DB) {
return
}
func (db *DB) JoinsOn(query string, on clause.Expression, args ...interface{}) (tx *DB) {
tx = db.getInstance()
tx.Statement.Joins = append(tx.Statement.Joins, join{Name: query, Conds: args, On: on})
return
}
// Group specify the group method on the find
func (db *DB) Group(name string) (tx *DB) {
tx = db.getInstance()

1
statement.go
View File

@ -50,6 +50,7 @@ type Statement struct {
type join struct {
Name string
Conds []interface{}
On clause.Expression
}
// StatementModifier statement modifier interface