Finish implement association support
This commit is contained in:
Jinzhu
parent
20cb57b1ac
commit
0f21272c7f
198
association.go
198
association.go
@ -1,6 +1,7 @@
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package gorm
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import (
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"errors"
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"fmt"
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"reflect"
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@ -34,16 +35,119 @@ func (db *DB) Association(column string) *Association {
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func (association *Association) Find(out interface{}, conds ...interface{}) error {
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if association.Error == nil {
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var (
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tx = association.DB
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queryConds = association.Relationship.ToQueryConditions(tx.Statement.ReflectValue)
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)
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if association.Relationship.JoinTable != nil {
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for _, queryClause := range association.Relationship.JoinTable.QueryClauses {
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tx.Clauses(queryClause)
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}
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tx.Clauses(clause.From{Joins: []clause.Join{{
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Table: clause.Table{Name: association.Relationship.JoinTable.Table},
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ON: clause.Where{Exprs: queryConds},
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}}})
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} else {
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tx.Clauses(clause.Where{Exprs: queryConds})
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}
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association.Error = tx.Find(out, conds...).Error
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}
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return association.Error
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}
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func (association *Association) Append(values ...interface{}) error {
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if association.Error == nil {
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switch association.Relationship.Type {
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case schema.HasOne, schema.BelongsTo:
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if len(values) > 0 {
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association.Error = association.Replace(values...)
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}
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default:
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association.saveAssociation(false, values...)
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}
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}
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return association.Error
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}
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func (association *Association) Replace(values ...interface{}) error {
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if association.Error == nil {
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association.saveAssociation(true, values...)
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reflectValue := association.DB.Statement.ReflectValue
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rel := association.Relationship
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switch rel.Type {
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case schema.HasOne, schema.HasMany:
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var (
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primaryFields []*schema.Field
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foreignKeys []string
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updateMap = map[string]interface{}{}
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modelValue = reflect.New(rel.FieldSchema.ModelType).Interface()
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)
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for _, ref := range rel.References {
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if ref.OwnPrimaryKey {
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primaryFields = append(primaryFields, ref.PrimaryKey)
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} else {
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foreignKeys = append(foreignKeys, ref.ForeignKey.DBName)
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updateMap[ref.ForeignKey.DBName] = nil
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}
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}
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_, values := schema.GetIdentityFieldValuesMap(reflectValue, primaryFields)
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column, queryValues := schema.ToQueryValues(foreignKeys, values)
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association.DB.Model(modelValue).Where(clause.IN{Column: column, Values: queryValues}).UpdateColumns(updateMap)
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case schema.Many2Many:
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var primaryFields, relPrimaryFields []*schema.Field
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var foreignKeys, relForeignKeys []string
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modelValue := reflect.New(rel.JoinTable.ModelType).Interface()
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conds := []clause.Expression{}
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for _, ref := range rel.References {
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if ref.OwnPrimaryKey {
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primaryFields = append(primaryFields, ref.PrimaryKey)
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foreignKeys = append(foreignKeys, ref.ForeignKey.DBName)
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} else if ref.PrimaryValue != "" {
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conds = append(conds, clause.Eq{
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Column: clause.Column{Table: rel.JoinTable.Table, Name: ref.ForeignKey.DBName},
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Value: ref.PrimaryValue,
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})
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} else {
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relPrimaryFields = append(relPrimaryFields, ref.PrimaryKey)
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relForeignKeys = append(relForeignKeys, ref.ForeignKey.DBName)
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}
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}
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generateConds := func(rv reflect.Value) {
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_, values := schema.GetIdentityFieldValuesMap(rv, primaryFields)
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column, queryValues := schema.ToQueryValues(foreignKeys, values)
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relValue := rel.Field.ReflectValueOf(rv)
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_, relValues := schema.GetIdentityFieldValuesMap(relValue, relPrimaryFields)
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relColumn, relQueryValues := schema.ToQueryValues(relForeignKeys, relValues)
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conds = append(conds, clause.And(
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clause.IN{Column: column, Values: queryValues},
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clause.Not(clause.IN{Column: relColumn, Values: relQueryValues}),
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))
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}
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switch reflectValue.Kind() {
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case reflect.Struct:
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generateConds(reflectValue)
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case reflect.Slice, reflect.Array:
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for i := 0; i < reflectValue.Len(); i++ {
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generateConds(reflectValue.Index(i))
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}
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}
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association.DB.Where(conds).Delete(modelValue)
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}
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}
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return association.Error
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}
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@ -78,7 +182,7 @@ func (association *Association) Delete(values ...interface{}) error {
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column, values := schema.ToQueryValues(foreignKeys, relQueryValues)
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tx.Where(clause.IN{Column: column, Values: values})
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switch association.Relationship.Type {
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switch rel.Type {
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case schema.HasOne, schema.HasMany:
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modelValue := reflect.New(rel.FieldSchema.ModelType).Interface()
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tx.Model(modelValue).Clauses(clause.Where{Exprs: conds}).UpdateColumns(updateAttrs)
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@ -164,3 +268,95 @@ func (association *Association) Count() (count int) {
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return
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}
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func (association *Association) saveAssociation(clear bool, values ...interface{}) {
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reflectValue := association.DB.Statement.ReflectValue
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appendToRelations := func(source, rv reflect.Value, clear bool) {
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switch association.Relationship.Type {
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case schema.HasOne, schema.BelongsTo:
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switch rv.Kind() {
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case reflect.Slice, reflect.Array:
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if rv.Len() > 0 {
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association.Error = association.Relationship.Field.Set(source, rv.Index(0))
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}
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case reflect.Struct:
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association.Error = association.Relationship.Field.Set(source, rv)
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}
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case schema.HasMany, schema.Many2Many:
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elemType := association.Relationship.Field.IndirectFieldType.Elem()
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fieldValue := reflect.Indirect(association.Relationship.Field.ReflectValueOf(reflectValue))
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if clear {
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fieldValue = reflect.New(association.Relationship.Field.IndirectFieldType)
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}
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appendToFieldValues := func(ev reflect.Value) {
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if ev.Type().AssignableTo(elemType) {
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fieldValue = reflect.Append(fieldValue, ev)
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} else if ev.Type().Elem().AssignableTo(elemType) {
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fieldValue = reflect.Append(fieldValue, ev.Elem())
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} else {
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association.Error = fmt.Errorf("unsupported data type: %v for relation %v", ev.Type(), association.Relationship.Name)
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}
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}
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switch rv.Kind() {
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case reflect.Slice, reflect.Array:
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for i := 0; i < rv.Len(); i++ {
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appendToFieldValues(reflect.Indirect(rv.Index(i)))
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}
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case reflect.Struct:
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appendToFieldValues(rv)
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}
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if association.Error == nil {
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association.Error = association.Relationship.Field.Set(source, fieldValue)
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}
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}
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}
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selectedColumns := []string{association.Relationship.Name}
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hasZero := false
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for _, ref := range association.Relationship.References {
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if !ref.OwnPrimaryKey {
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selectedColumns = append(selectedColumns, ref.ForeignKey.Name)
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}
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}
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switch reflectValue.Kind() {
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case reflect.Slice, reflect.Array:
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if len(values) != reflectValue.Len() {
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if clear && len(values) == 0 {
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for i := 0; i < reflectValue.Len(); i++ {
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association.Relationship.Field.Set(reflectValue.Index(i), reflect.New(association.Relationship.Field.IndirectFieldType))
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}
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break
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}
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association.Error = errors.New("invalid association values, length doesn't match")
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}
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for i := 0; i < reflectValue.Len(); i++ {
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appendToRelations(reflectValue.Index(i), reflect.Indirect(reflect.ValueOf(values[i])), clear)
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if !hasZero {
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_, hasZero = association.DB.Statement.Schema.PrioritizedPrimaryField.ValueOf(reflectValue.Index(i))
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}
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}
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case reflect.Struct:
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if clear && len(values) == 0 {
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association.Relationship.Field.Set(reflectValue, reflect.New(association.Relationship.Field.IndirectFieldType))
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}
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for idx, value := range values {
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appendToRelations(reflectValue, reflect.Indirect(reflect.ValueOf(value)), clear && idx == 0)
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}
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_, hasZero = association.DB.Statement.Schema.PrioritizedPrimaryField.ValueOf(reflectValue)
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}
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if hasZero {
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association.DB.Save(reflectValue.Interface())
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} else {
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association.DB.Select(selectedColumns).Save(reflectValue.Interface())
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}
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}
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@ -28,7 +28,7 @@ func SaveBeforeAssociations(db *gorm.DB) {
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}
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switch db.Statement.ReflectValue.Kind() {
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case reflect.Slice:
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case reflect.Slice, reflect.Array:
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var (
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objs []reflect.Value
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fieldType = rel.Field.FieldType
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@ -92,7 +92,7 @@ func SaveAfterAssociations(db *gorm.DB) {
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}
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switch db.Statement.ReflectValue.Kind() {
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case reflect.Slice:
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case reflect.Slice, reflect.Array:
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var (
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fieldType = rel.Field.FieldType
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isPtr = fieldType.Kind() == reflect.Ptr
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@ -193,7 +193,7 @@ func SaveAfterAssociations(db *gorm.DB) {
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}
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switch db.Statement.ReflectValue.Kind() {
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case reflect.Slice:
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case reflect.Slice, reflect.Array:
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for i := 0; i < db.Statement.ReflectValue.Len(); i++ {
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appendToElems(db.Statement.ReflectValue.Index(i))
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}
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@ -260,7 +260,7 @@ func SaveAfterAssociations(db *gorm.DB) {
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}
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switch db.Statement.ReflectValue.Kind() {
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case reflect.Slice:
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case reflect.Slice, reflect.Array:
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for i := 0; i < db.Statement.ReflectValue.Len(); i++ {
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appendToElems(db.Statement.ReflectValue.Index(i))
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}
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