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model_table_m2m.go
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model_table_m2m.go
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package orm
import (
"fmt"
"reflect"
)
type m2mModel struct {
*sliceTableModel
baseTable *Table
rel *Relation
buf []byte
dstValues map[string][]reflect.Value
columns map[string]string
}
var _ tableModel = (*m2mModel)(nil)
func newM2MModel(j *join) *m2mModel {
baseTable := j.BaseModel.Table()
joinModel := j.JoinModel.(*sliceTableModel)
dstValues := dstValues(joinModel, baseTable.PKs)
if len(dstValues) == 0 {
return nil
}
m := &m2mModel{
sliceTableModel: joinModel,
baseTable: baseTable,
rel: j.Rel,
dstValues: dstValues,
columns: make(map[string]string),
}
if !m.sliceOfPtr {
m.strct = reflect.New(m.table.Type).Elem()
}
return m
}
func (m *m2mModel) NewModel() ColumnScanner {
if m.sliceOfPtr {
m.strct = reflect.New(m.table.Type).Elem()
} else {
m.strct.Set(m.table.zeroStruct)
}
m.structInited = false
m.structTableModel.NewModel()
return m
}
func (m *m2mModel) AddModel(model ColumnScanner) error {
m.buf = modelIdMap(m.buf[:0], m.columns, m.rel.BaseFKs)
dstValues, ok := m.dstValues[string(m.buf)]
if !ok {
return fmt.Errorf(
"pg: relation=%q has no base %s with id=%q (check join conditions)",
m.rel.Field.GoName, m.baseTable, m.buf)
}
for _, v := range dstValues {
if m.sliceOfPtr {
v.Set(reflect.Append(v, m.strct.Addr()))
} else {
v.Set(reflect.Append(v, m.strct))
}
}
return nil
}
func modelIdMap(b []byte, m map[string]string, columns []string) []byte {
for i, col := range columns {
if i > 0 {
b = append(b, ',')
}
b = append(b, m[col]...)
}
return b
}
func (m *m2mModel) AfterQuery(db DB) error {
if !m.rel.JoinTable.HasFlag(AfterQueryHookFlag) {
return nil
}
var retErr error
for _, slices := range m.dstValues {
for _, slice := range slices {
err := callAfterQueryHookSlice(slice, m.sliceOfPtr, db)
if err != nil && retErr == nil {
retErr = err
}
}
}
return retErr
}
func (m *m2mModel) AfterSelect(db DB) error {
return nil
}
func (m *m2mModel) BeforeInsert(db DB) error {
return nil
}
func (m *m2mModel) AfterInsert(db DB) error {
return nil
}
func (m *m2mModel) BeforeUpdate(db DB) error {
return nil
}
func (m *m2mModel) AfterUpdate(db DB) error {
return nil
}
func (m *m2mModel) BeforeDelete(db DB) error {
return nil
}
func (m *m2mModel) AfterDelete(db DB) error {
return nil
}
func (m *m2mModel) ScanColumn(colIdx int, colName string, b []byte) error {
ok, err := m.sliceTableModel.scanColumn(colIdx, colName, b)
if ok {
return err
}
m.columns[colName] = string(b)
return nil
}