Beego/orm/orm_querym2m.go

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// Copyright 2014 beego Author. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package orm
import (
"reflect"
)
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// model to model struct
type queryM2M struct {
md interface{}
mi *modelInfo
fi *fieldInfo
qs *querySet
ind reflect.Value
}
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// add models to origin models when creating queryM2M.
// example:
// m2m := orm.QueryM2M(post,"Tag")
// m2m.Add(&Tag1{},&Tag2{})
// for _,tag := range post.Tags{}
//
// make sure the relation is defined in post model struct tag.
func (o *queryM2M) Add(mds ...interface{}) (int64, error) {
fi := o.fi
mi := fi.relThroughModelInfo
mfi := fi.reverseFieldInfo
rfi := fi.reverseFieldInfoTwo
orm := o.qs.orm
dbase := orm.alias.DbBaser
var models []interface{}
for _, md := range mds {
val := reflect.ValueOf(md)
if val.Kind() == reflect.Slice || val.Kind() == reflect.Array {
for i := 0; i < val.Len(); i++ {
v := val.Index(i)
if v.CanInterface() {
models = append(models, v.Interface())
}
}
} else {
models = append(models, md)
}
}
_, v1, exist := getExistPk(o.mi, o.ind)
if exist == false {
panic(ErrMissPK)
}
names := []string{mfi.column, rfi.column}
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values := make([]interface{}, 0, len(models)*2)
for _, md := range models {
ind := reflect.Indirect(reflect.ValueOf(md))
var v2 interface{}
if ind.Kind() != reflect.Struct {
v2 = ind.Interface()
} else {
_, v2, exist = getExistPk(fi.relModelInfo, ind)
if exist == false {
panic(ErrMissPK)
}
}
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values = append(values, v1, v2)
}
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return dbase.InsertValue(orm.db, mi, true, names, values)
}
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// remove models following the origin model relationship
func (o *queryM2M) Remove(mds ...interface{}) (int64, error) {
fi := o.fi
qs := o.qs.Filter(fi.reverseFieldInfo.name, o.md)
nums, err := qs.Filter(fi.reverseFieldInfoTwo.name+ExprSep+"in", mds).Delete()
if err != nil {
return nums, err
}
return nums, nil
}
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// check model is existed in relationship of origin model
func (o *queryM2M) Exist(md interface{}) bool {
fi := o.fi
return o.qs.Filter(fi.reverseFieldInfo.name, o.md).
Filter(fi.reverseFieldInfoTwo.name, md).Exist()
}
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// clean all models in related of origin model
func (o *queryM2M) Clear() (int64, error) {
fi := o.fi
return o.qs.Filter(fi.reverseFieldInfo.name, o.md).Delete()
}
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// count all related models of origin model
func (o *queryM2M) Count() (int64, error) {
fi := o.fi
return o.qs.Filter(fi.reverseFieldInfo.name, o.md).Count()
}
var _ QueryM2Mer = new(queryM2M)
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// create new M2M queryer.
func newQueryM2M(md interface{}, o *orm, mi *modelInfo, fi *fieldInfo, ind reflect.Value) QueryM2Mer {
qm2m := new(queryM2M)
qm2m.md = md
qm2m.mi = mi
qm2m.fi = fi
qm2m.ind = ind
qm2m.qs = newQuerySet(o, fi.relThroughModelInfo).(*querySet)
return qm2m
}