forked from mirror/gorm
424 lines
13 KiB
Go
424 lines
13 KiB
Go
package gorm
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"reflect"
|
|
|
|
"github.com/jinzhu/gorm/clause"
|
|
"github.com/jinzhu/gorm/schema"
|
|
"github.com/jinzhu/gorm/utils"
|
|
)
|
|
|
|
// Association Mode contains some helper methods to handle relationship things easily.
|
|
type Association struct {
|
|
DB *DB
|
|
Relationship *schema.Relationship
|
|
Error error
|
|
}
|
|
|
|
func (db *DB) Association(column string) *Association {
|
|
association := &Association{DB: db}
|
|
table := db.Statement.Table
|
|
|
|
if err := db.Statement.Parse(db.Statement.Model); err == nil {
|
|
db.Statement.Table = table
|
|
association.Relationship = db.Statement.Schema.Relationships.Relations[column]
|
|
|
|
if association.Relationship == nil {
|
|
association.Error = fmt.Errorf("%w: %v", ErrUnsupportedRelation, column)
|
|
}
|
|
|
|
db.Statement.ReflectValue = reflect.Indirect(reflect.ValueOf(db.Statement.Model))
|
|
} else {
|
|
association.Error = err
|
|
}
|
|
|
|
return association
|
|
}
|
|
|
|
func (association *Association) Find(out interface{}, conds ...interface{}) error {
|
|
if association.Error == nil {
|
|
var (
|
|
queryConds = association.Relationship.ToQueryConditions(association.DB.Statement.ReflectValue)
|
|
tx = association.DB.Model(out).Table("")
|
|
)
|
|
|
|
if association.Relationship.JoinTable != nil {
|
|
for _, queryClause := range association.Relationship.JoinTable.QueryClauses {
|
|
tx.Clauses(queryClause)
|
|
}
|
|
|
|
tx.Clauses(clause.From{Joins: []clause.Join{{
|
|
Table: clause.Table{Name: association.Relationship.JoinTable.Table},
|
|
ON: clause.Where{Exprs: queryConds},
|
|
}}})
|
|
} else {
|
|
tx.Clauses(clause.Where{Exprs: queryConds})
|
|
}
|
|
|
|
association.Error = tx.Find(out, conds...).Error
|
|
}
|
|
|
|
return association.Error
|
|
}
|
|
|
|
func (association *Association) Append(values ...interface{}) error {
|
|
if association.Error == nil {
|
|
switch association.Relationship.Type {
|
|
case schema.HasOne, schema.BelongsTo:
|
|
if len(values) > 0 {
|
|
association.Error = association.Replace(values...)
|
|
}
|
|
default:
|
|
association.saveAssociation(false, values...)
|
|
}
|
|
}
|
|
|
|
return association.Error
|
|
}
|
|
|
|
func (association *Association) Replace(values ...interface{}) error {
|
|
if association.Error == nil {
|
|
association.saveAssociation(true, values...)
|
|
reflectValue := association.DB.Statement.ReflectValue
|
|
rel := association.Relationship
|
|
|
|
switch rel.Type {
|
|
case schema.BelongsTo:
|
|
if len(values) == 0 {
|
|
updateMap := map[string]interface{}{}
|
|
|
|
for _, ref := range rel.References {
|
|
updateMap[ref.ForeignKey.DBName] = nil
|
|
}
|
|
|
|
association.DB.UpdateColumns(updateMap)
|
|
}
|
|
case schema.HasOne, schema.HasMany:
|
|
var (
|
|
primaryFields []*schema.Field
|
|
foreignKeys []string
|
|
updateMap = map[string]interface{}{}
|
|
modelValue = reflect.New(rel.FieldSchema.ModelType).Interface()
|
|
)
|
|
if rel.Type == schema.BelongsTo {
|
|
modelValue = reflect.New(rel.Schema.ModelType).Interface()
|
|
}
|
|
|
|
for _, ref := range rel.References {
|
|
if ref.OwnPrimaryKey {
|
|
primaryFields = append(primaryFields, ref.PrimaryKey)
|
|
} else {
|
|
foreignKeys = append(foreignKeys, ref.ForeignKey.DBName)
|
|
updateMap[ref.ForeignKey.DBName] = nil
|
|
}
|
|
}
|
|
|
|
_, values := schema.GetIdentityFieldValuesMap(reflectValue, primaryFields)
|
|
if len(values) == 0 {
|
|
column, queryValues := schema.ToQueryValues(foreignKeys, values)
|
|
association.DB.Model(modelValue).Where(clause.IN{Column: column, Values: queryValues}).UpdateColumns(updateMap)
|
|
}
|
|
case schema.Many2Many:
|
|
var primaryFields, relPrimaryFields []*schema.Field
|
|
var foreignKeys, relForeignKeys []string
|
|
modelValue := reflect.New(rel.JoinTable.ModelType).Interface()
|
|
conds := []clause.Expression{}
|
|
|
|
for _, ref := range rel.References {
|
|
if ref.OwnPrimaryKey {
|
|
primaryFields = append(primaryFields, ref.PrimaryKey)
|
|
foreignKeys = append(foreignKeys, ref.ForeignKey.DBName)
|
|
} else if ref.PrimaryValue != "" {
|
|
conds = append(conds, clause.Eq{
|
|
Column: clause.Column{Table: rel.JoinTable.Table, Name: ref.ForeignKey.DBName},
|
|
Value: ref.PrimaryValue,
|
|
})
|
|
} else {
|
|
relPrimaryFields = append(relPrimaryFields, ref.PrimaryKey)
|
|
relForeignKeys = append(relForeignKeys, ref.ForeignKey.DBName)
|
|
}
|
|
}
|
|
|
|
generateConds := func(rv reflect.Value) {
|
|
_, values := schema.GetIdentityFieldValuesMap(rv, primaryFields)
|
|
column, queryValues := schema.ToQueryValues(foreignKeys, values)
|
|
|
|
relValue := rel.Field.ReflectValueOf(rv)
|
|
_, relValues := schema.GetIdentityFieldValuesMap(relValue, relPrimaryFields)
|
|
relColumn, relQueryValues := schema.ToQueryValues(relForeignKeys, relValues)
|
|
|
|
conds = append(conds, clause.And(
|
|
clause.IN{Column: column, Values: queryValues},
|
|
clause.Not(clause.IN{Column: relColumn, Values: relQueryValues}),
|
|
))
|
|
}
|
|
|
|
switch reflectValue.Kind() {
|
|
case reflect.Struct:
|
|
generateConds(reflectValue)
|
|
case reflect.Slice, reflect.Array:
|
|
for i := 0; i < reflectValue.Len(); i++ {
|
|
generateConds(reflectValue.Index(i))
|
|
}
|
|
}
|
|
|
|
association.DB.Where(conds).Delete(modelValue)
|
|
}
|
|
}
|
|
return association.Error
|
|
}
|
|
|
|
func (association *Association) Delete(values ...interface{}) error {
|
|
if association.Error == nil {
|
|
var (
|
|
tx = association.DB
|
|
rel = association.Relationship
|
|
reflectValue = tx.Statement.ReflectValue
|
|
relFields []*schema.Field
|
|
foreignKeyFields []*schema.Field
|
|
foreignKeys []string
|
|
updateAttrs = map[string]interface{}{}
|
|
)
|
|
|
|
for _, ref := range rel.References {
|
|
if ref.PrimaryValue == "" {
|
|
if rel.JoinTable == nil || !ref.OwnPrimaryKey {
|
|
if ref.OwnPrimaryKey {
|
|
relFields = append(relFields, ref.ForeignKey)
|
|
} else {
|
|
relFields = append(relFields, ref.PrimaryKey)
|
|
foreignKeyFields = append(foreignKeyFields, ref.ForeignKey)
|
|
}
|
|
|
|
foreignKeys = append(foreignKeys, ref.ForeignKey.DBName)
|
|
updateAttrs[ref.ForeignKey.DBName] = nil
|
|
}
|
|
} else {
|
|
tx.Where(clause.Eq{Column: ref.ForeignKey.DBName, Value: ref.PrimaryKey})
|
|
}
|
|
}
|
|
|
|
relValuesMap, relQueryValues := schema.GetIdentityFieldValuesMapFromValues(values, relFields)
|
|
column, values := schema.ToQueryValues(foreignKeys, relQueryValues)
|
|
tx.Where(clause.IN{Column: column, Values: values})
|
|
|
|
switch rel.Type {
|
|
case schema.HasOne, schema.HasMany:
|
|
modelValue := reflect.New(rel.FieldSchema.ModelType).Interface()
|
|
conds := rel.ToQueryConditions(reflectValue)
|
|
tx.Model(modelValue).Clauses(clause.Where{Exprs: conds}).UpdateColumns(updateAttrs)
|
|
case schema.BelongsTo:
|
|
primaryKeys := []string{}
|
|
for _, field := range rel.Schema.PrimaryFields {
|
|
primaryKeys = append(primaryKeys, field.DBName)
|
|
}
|
|
_, queryValues := schema.GetIdentityFieldValuesMap(reflectValue, rel.Schema.PrimaryFields)
|
|
if column, values := schema.ToQueryValues(primaryKeys, queryValues); len(values) > 0 {
|
|
tx.Where(clause.IN{Column: column, Values: values})
|
|
}
|
|
|
|
modelValue := reflect.New(rel.Schema.ModelType).Interface()
|
|
tx.Model(modelValue).UpdateColumns(updateAttrs)
|
|
case schema.Many2Many:
|
|
modelValue := reflect.New(rel.JoinTable.ModelType).Interface()
|
|
conds := rel.ToQueryConditions(reflectValue)
|
|
tx.Clauses(clause.Where{Exprs: conds}).Delete(modelValue)
|
|
}
|
|
|
|
if tx.Error == nil {
|
|
cleanUpDeletedRelations := func(data reflect.Value) {
|
|
if _, zero := rel.Field.ValueOf(data); !zero {
|
|
fieldValue := reflect.Indirect(rel.Field.ReflectValueOf(data))
|
|
|
|
fieldValues := make([]interface{}, len(relFields))
|
|
switch fieldValue.Kind() {
|
|
case reflect.Slice, reflect.Array:
|
|
validFieldValues := reflect.Zero(rel.Field.FieldType)
|
|
for i := 0; i < fieldValue.Len(); i++ {
|
|
for idx, field := range relFields {
|
|
fieldValues[idx], _ = field.ValueOf(fieldValue.Index(i))
|
|
}
|
|
|
|
if _, ok := relValuesMap[utils.ToStringKey(fieldValues...)]; !ok {
|
|
validFieldValues = reflect.Append(validFieldValues, fieldValue.Index(i))
|
|
}
|
|
}
|
|
|
|
rel.Field.Set(data, validFieldValues.Interface())
|
|
case reflect.Struct:
|
|
for idx, field := range relFields {
|
|
fieldValues[idx], _ = field.ValueOf(fieldValue)
|
|
}
|
|
if _, ok := relValuesMap[utils.ToStringKey(fieldValues...)]; ok {
|
|
rel.Field.Set(data, reflect.Zero(rel.FieldSchema.ModelType).Interface())
|
|
for _, field := range foreignKeyFields {
|
|
field.Set(data, reflect.Zero(field.FieldType).Interface())
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
switch reflectValue.Kind() {
|
|
case reflect.Slice, reflect.Array:
|
|
for i := 0; i < reflectValue.Len(); i++ {
|
|
cleanUpDeletedRelations(reflect.Indirect(reflectValue.Index(i)))
|
|
}
|
|
case reflect.Struct:
|
|
cleanUpDeletedRelations(reflectValue)
|
|
}
|
|
} else {
|
|
association.Error = tx.Error
|
|
}
|
|
}
|
|
return association.Error
|
|
}
|
|
|
|
func (association *Association) Clear() error {
|
|
return association.Replace()
|
|
}
|
|
|
|
func (association *Association) Count() (count int64) {
|
|
if association.Error == nil {
|
|
var (
|
|
conds = association.Relationship.ToQueryConditions(association.DB.Statement.ReflectValue)
|
|
modelValue = reflect.New(association.Relationship.FieldSchema.ModelType).Interface()
|
|
tx = association.DB.Model(modelValue)
|
|
)
|
|
|
|
if association.Relationship.JoinTable != nil {
|
|
for _, queryClause := range association.Relationship.JoinTable.QueryClauses {
|
|
tx.Clauses(queryClause)
|
|
}
|
|
|
|
tx.Clauses(clause.From{Joins: []clause.Join{{
|
|
Table: clause.Table{Name: association.Relationship.JoinTable.Table},
|
|
ON: clause.Where{Exprs: conds},
|
|
}}})
|
|
} else {
|
|
tx.Clauses(clause.Where{Exprs: conds})
|
|
}
|
|
|
|
association.Error = tx.Count(&count).Error
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func (association *Association) saveAssociation(clear bool, values ...interface{}) {
|
|
var (
|
|
reflectValue = association.DB.Statement.ReflectValue
|
|
assignBacks = [][2]reflect.Value{}
|
|
assignBack = association.Relationship.Field.FieldType.Kind() == reflect.Struct
|
|
)
|
|
|
|
appendToRelations := func(source, rv reflect.Value, clear bool) {
|
|
switch association.Relationship.Type {
|
|
case schema.HasOne, schema.BelongsTo:
|
|
switch rv.Kind() {
|
|
case reflect.Slice, reflect.Array:
|
|
if rv.Len() > 0 {
|
|
association.Error = association.Relationship.Field.Set(source, rv.Index(0).Addr().Interface())
|
|
if assignBack {
|
|
assignBacks = append(assignBacks, [2]reflect.Value{source, rv.Index(0)})
|
|
}
|
|
}
|
|
case reflect.Struct:
|
|
association.Error = association.Relationship.Field.Set(source, rv.Addr().Interface())
|
|
if assignBack {
|
|
assignBacks = append(assignBacks, [2]reflect.Value{source, rv})
|
|
}
|
|
}
|
|
case schema.HasMany, schema.Many2Many:
|
|
elemType := association.Relationship.Field.IndirectFieldType.Elem()
|
|
fieldValue := reflect.Indirect(association.Relationship.Field.ReflectValueOf(reflectValue))
|
|
if clear {
|
|
fieldValue = reflect.New(association.Relationship.Field.IndirectFieldType)
|
|
}
|
|
|
|
appendToFieldValues := func(ev reflect.Value) {
|
|
if ev.Type().AssignableTo(elemType) {
|
|
fieldValue = reflect.Append(fieldValue, ev)
|
|
} else if ev.Type().Elem().AssignableTo(elemType) {
|
|
fieldValue = reflect.Append(fieldValue, ev.Elem())
|
|
} else {
|
|
association.Error = fmt.Errorf("unsupported data type: %v for relation %v", ev.Type(), association.Relationship.Name)
|
|
}
|
|
}
|
|
|
|
switch rv.Kind() {
|
|
case reflect.Slice, reflect.Array:
|
|
for i := 0; i < rv.Len(); i++ {
|
|
appendToFieldValues(reflect.Indirect(rv.Index(i)))
|
|
}
|
|
case reflect.Struct:
|
|
appendToFieldValues(rv)
|
|
}
|
|
|
|
if association.Error == nil {
|
|
association.Error = association.Relationship.Field.Set(source, fieldValue.Addr().Interface())
|
|
}
|
|
}
|
|
}
|
|
|
|
selectedColumns := []string{association.Relationship.Name}
|
|
for _, ref := range association.Relationship.References {
|
|
if !ref.OwnPrimaryKey {
|
|
selectedColumns = append(selectedColumns, ref.ForeignKey.Name)
|
|
}
|
|
}
|
|
|
|
switch reflectValue.Kind() {
|
|
case reflect.Slice, reflect.Array:
|
|
if len(values) != reflectValue.Len() {
|
|
if clear && len(values) == 0 {
|
|
for i := 0; i < reflectValue.Len(); i++ {
|
|
association.Relationship.Field.Set(reflectValue.Index(i), reflect.New(association.Relationship.Field.IndirectFieldType).Interface())
|
|
for _, ref := range association.Relationship.References {
|
|
if !ref.OwnPrimaryKey {
|
|
ref.ForeignKey.Set(reflectValue.Index(i), reflect.Zero(ref.ForeignKey.FieldType).Interface())
|
|
}
|
|
}
|
|
}
|
|
break
|
|
}
|
|
association.Error = errors.New("invalid association values, length doesn't match")
|
|
return
|
|
}
|
|
|
|
for i := 0; i < reflectValue.Len(); i++ {
|
|
appendToRelations(reflectValue.Index(i), reflect.Indirect(reflect.ValueOf(values[i])), clear)
|
|
|
|
if len(values) > 0 {
|
|
// TODO support save slice data, sql with case
|
|
err := association.DB.Session(&Session{}).Select(selectedColumns).Model(nil).Save(reflectValue.Index(i).Addr().Interface()).Error
|
|
association.DB.AddError(err)
|
|
}
|
|
}
|
|
case reflect.Struct:
|
|
if clear && len(values) == 0 {
|
|
association.Relationship.Field.Set(reflectValue, reflect.New(association.Relationship.Field.IndirectFieldType).Interface())
|
|
for _, ref := range association.Relationship.References {
|
|
if !ref.OwnPrimaryKey {
|
|
ref.ForeignKey.Set(reflectValue, reflect.Zero(ref.ForeignKey.FieldType).Interface())
|
|
}
|
|
}
|
|
}
|
|
|
|
for idx, value := range values {
|
|
rv := reflect.Indirect(reflect.ValueOf(value))
|
|
appendToRelations(reflectValue, rv, clear && idx == 0)
|
|
}
|
|
|
|
if len(values) > 0 {
|
|
association.DB.Select(selectedColumns).Model(nil).Save(reflectValue.Addr().Interface())
|
|
}
|
|
}
|
|
|
|
for _, assignBack := range assignBacks {
|
|
reflect.Indirect(assignBack[1]).Set(association.Relationship.Field.ReflectValueOf(assignBack[0]))
|
|
}
|
|
}
|