mirror of https://github.com/go-gorm/gorm.git
409 lines
14 KiB
Go
409 lines
14 KiB
Go
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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"strings"
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)
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type Association struct {
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Scope *Scope
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Column string
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Error error
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Field *Field
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}
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func (association *Association) setErr(err error) *Association {
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if err != nil {
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association.Error = err
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}
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return association
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}
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func (association *Association) Find(value interface{}) *Association {
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association.Scope.related(value, association.Column)
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return association.setErr(association.Scope.db.Error)
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}
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func (association *Association) saveAssociations(values ...interface{}) *Association {
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scope := association.Scope
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field := association.Field
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relationship := association.Field.Relationship
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saveAssociation := func(reflectValue reflect.Value) {
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// value has to been pointer
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if reflectValue.Kind() != reflect.Ptr {
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reflectPtr := reflect.New(reflectValue.Type())
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reflectPtr.Elem().Set(reflectValue)
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reflectValue = reflectPtr
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}
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// value has to been saved for many2many
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if relationship.Kind == "many_to_many" {
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if scope.New(reflectValue.Interface()).PrimaryKeyZero() {
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association.setErr(scope.NewDB().Save(reflectValue.Interface()).Error)
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}
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}
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// Assign Fields
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var fieldType = field.Field.Type()
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var setFieldBackToValue, setSliceFieldBackToValue bool
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if reflectValue.Type().AssignableTo(fieldType) {
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field.Set(reflectValue)
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} else if reflectValue.Type().Elem().AssignableTo(fieldType) {
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// if field's type is struct, then need to set value back to argument after save
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setFieldBackToValue = true
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field.Set(reflectValue.Elem())
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} else if fieldType.Kind() == reflect.Slice {
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if reflectValue.Type().AssignableTo(fieldType.Elem()) {
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field.Set(reflect.Append(field.Field, reflectValue))
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} else if reflectValue.Type().Elem().AssignableTo(fieldType.Elem()) {
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// if field's type is slice of struct, then need to set value back to argument after save
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setSliceFieldBackToValue = true
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field.Set(reflect.Append(field.Field, reflectValue.Elem()))
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}
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}
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if relationship.Kind == "many_to_many" {
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association.setErr(relationship.JoinTableHandler.Add(relationship.JoinTableHandler, scope.NewDB(), scope.Value, reflectValue.Interface()))
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} else {
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association.setErr(scope.NewDB().Select(field.Name).Save(scope.Value).Error)
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if setFieldBackToValue {
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reflectValue.Elem().Set(field.Field)
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} else if setSliceFieldBackToValue {
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reflectValue.Elem().Set(field.Field.Index(field.Field.Len() - 1))
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}
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}
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}
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for _, value := range values {
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reflectValue := reflect.ValueOf(value)
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indirectReflectValue := reflect.Indirect(reflectValue)
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if indirectReflectValue.Kind() == reflect.Struct {
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saveAssociation(reflectValue)
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} else if indirectReflectValue.Kind() == reflect.Slice {
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for i := 0; i < indirectReflectValue.Len(); i++ {
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saveAssociation(indirectReflectValue.Index(i))
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}
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} else {
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association.setErr(errors.New("invalid value type"))
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}
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}
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return association
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}
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func (association *Association) Append(values ...interface{}) *Association {
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if relationship := association.Field.Relationship; relationship.Kind == "has_one" {
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return association.Replace(values...)
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}
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return association.saveAssociations(values...)
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}
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func (association *Association) Replace(values ...interface{}) *Association {
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var (
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relationship = association.Field.Relationship
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scope = association.Scope
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field = association.Field.Field
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newDB = scope.NewDB()
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)
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// Append new values
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association.Field.Set(reflect.Zero(association.Field.Field.Type()))
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association.saveAssociations(values...)
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// Belongs To
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if relationship.Kind == "belongs_to" {
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// Set foreign key to be null only when clearing value
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if len(values) == 0 {
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// Set foreign key to be nil
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var foreignKeyMap = map[string]interface{}{}
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for _, foreignKey := range relationship.ForeignDBNames {
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foreignKeyMap[foreignKey] = nil
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}
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association.setErr(newDB.Model(scope.Value).UpdateColumn(foreignKeyMap).Error)
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}
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} else {
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// Relations
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if relationship.PolymorphicDBName != "" {
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newDB = newDB.Where(fmt.Sprintf("%v = ?", scope.Quote(relationship.PolymorphicDBName)), scope.TableName())
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}
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// Relations except new created
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if len(values) > 0 {
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var newPrimaryKeys [][]interface{}
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var associationForeignFieldNames []string
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if relationship.Kind == "many_to_many" {
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// If many to many relations, get it from foreign key
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associationForeignFieldNames = relationship.AssociationForeignFieldNames
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} else {
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// If other relations, get real primary keys
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for _, field := range scope.New(reflect.New(field.Type()).Interface()).Fields() {
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if field.IsPrimaryKey {
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associationForeignFieldNames = append(associationForeignFieldNames, field.Name)
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}
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}
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}
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newPrimaryKeys = association.getPrimaryKeys(associationForeignFieldNames, field.Interface())
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if len(newPrimaryKeys) > 0 {
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sql := fmt.Sprintf("%v NOT IN (%v)", toQueryCondition(scope, relationship.AssociationForeignDBNames), toQueryMarks(newPrimaryKeys))
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newDB = newDB.Where(sql, toQueryValues(newPrimaryKeys)...)
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}
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}
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if relationship.Kind == "many_to_many" {
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for idx, foreignKey := range relationship.ForeignDBNames {
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if field, ok := scope.FieldByName(relationship.ForeignFieldNames[idx]); ok {
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newDB = newDB.Where(fmt.Sprintf("%v = ?", scope.Quote(foreignKey)), field.Field.Interface())
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}
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}
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association.setErr(relationship.JoinTableHandler.Delete(relationship.JoinTableHandler, newDB, relationship))
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} else if relationship.Kind == "has_one" || relationship.Kind == "has_many" {
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var foreignKeyMap = map[string]interface{}{}
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for idx, foreignKey := range relationship.ForeignDBNames {
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foreignKeyMap[foreignKey] = nil
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if field, ok := scope.FieldByName(relationship.AssociationForeignFieldNames[idx]); ok {
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newDB = newDB.Where(fmt.Sprintf("%v = ?", scope.Quote(foreignKey)), field.Field.Interface())
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}
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}
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fieldValue := reflect.New(association.Field.Field.Type()).Interface()
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association.setErr(newDB.Model(fieldValue).UpdateColumn(foreignKeyMap).Error)
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}
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}
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return association
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}
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func (association *Association) Delete(values ...interface{}) *Association {
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var (
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relationship = association.Field.Relationship
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scope = association.Scope
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field = association.Field.Field
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newDB = scope.NewDB()
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)
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if len(values) == 0 {
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return association
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}
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var deletingResourcePrimaryFieldNames, deletingResourcePrimaryDBNames []string
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for _, field := range scope.New(reflect.New(field.Type()).Interface()).Fields() {
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if field.IsPrimaryKey {
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deletingResourcePrimaryFieldNames = append(deletingResourcePrimaryFieldNames, field.Name)
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deletingResourcePrimaryDBNames = append(deletingResourcePrimaryDBNames, field.DBName)
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}
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}
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deletingPrimaryKeys := association.getPrimaryKeys(deletingResourcePrimaryFieldNames, values...)
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if relationship.Kind == "many_to_many" {
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// source value's foreign keys
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for idx, foreignKey := range relationship.ForeignDBNames {
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if field, ok := scope.FieldByName(relationship.ForeignFieldNames[idx]); ok {
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newDB = newDB.Where(fmt.Sprintf("%v = ?", scope.Quote(foreignKey)), field.Field.Interface())
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}
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}
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// association value's foreign keys
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deletingPrimaryKeys := association.getPrimaryKeys(relationship.AssociationForeignFieldNames, values...)
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sql := fmt.Sprintf("%v IN (%v)", toQueryCondition(scope, relationship.AssociationForeignDBNames), toQueryMarks(deletingPrimaryKeys))
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newDB = newDB.Where(sql, toQueryValues(deletingPrimaryKeys)...)
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association.setErr(relationship.JoinTableHandler.Delete(relationship.JoinTableHandler, newDB, relationship))
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} else {
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var foreignKeyMap = map[string]interface{}{}
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for _, foreignKey := range relationship.ForeignDBNames {
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foreignKeyMap[foreignKey] = nil
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}
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if relationship.Kind == "belongs_to" {
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// find with deleting relation's foreign keys
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primaryKeys := association.getPrimaryKeys(relationship.AssociationForeignFieldNames, values...)
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newDB = newDB.Where(
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fmt.Sprintf("%v IN (%v)", toQueryCondition(scope, relationship.ForeignDBNames), toQueryMarks(primaryKeys)),
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toQueryValues(primaryKeys)...,
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)
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// set foreign key to be null
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modelValue := reflect.New(scope.GetModelStruct().ModelType).Interface()
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if results := newDB.Model(modelValue).UpdateColumn(foreignKeyMap); results.Error == nil {
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if results.RowsAffected > 0 {
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scope.updatedAttrsWithValues(foreignKeyMap, false)
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}
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} else {
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association.setErr(results.Error)
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}
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} else if relationship.Kind == "has_one" || relationship.Kind == "has_many" {
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// find all relations
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primaryKeys := association.getPrimaryKeys(relationship.AssociationForeignFieldNames, scope.Value)
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newDB = newDB.Where(
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fmt.Sprintf("%v IN (%v)", toQueryCondition(scope, relationship.ForeignDBNames), toQueryMarks(primaryKeys)),
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toQueryValues(primaryKeys)...,
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)
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// only include those deleting relations
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newDB = newDB.Where(
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fmt.Sprintf("%v IN (%v)", toQueryCondition(scope, deletingResourcePrimaryDBNames), toQueryMarks(deletingPrimaryKeys)),
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toQueryValues(deletingPrimaryKeys)...,
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)
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// set matched relation's foreign key to be null
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fieldValue := reflect.New(association.Field.Field.Type()).Interface()
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association.setErr(newDB.Model(fieldValue).UpdateColumn(foreignKeyMap).Error)
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}
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}
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// Remove deleted records from field
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if association.Error == nil {
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if association.Field.Field.Kind() == reflect.Slice {
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leftValues := reflect.Zero(association.Field.Field.Type())
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for i := 0; i < association.Field.Field.Len(); i++ {
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reflectValue := association.Field.Field.Index(i)
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primaryKey := association.getPrimaryKeys(deletingResourcePrimaryFieldNames, reflectValue.Interface())[0]
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var included = false
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for _, pk := range deletingPrimaryKeys {
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if equalAsString(primaryKey, pk) {
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included = true
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}
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}
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if !included {
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leftValues = reflect.Append(leftValues, reflectValue)
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}
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}
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association.Field.Set(leftValues)
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} else if association.Field.Field.Kind() == reflect.Struct {
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primaryKey := association.getPrimaryKeys(deletingResourcePrimaryFieldNames, association.Field.Field.Interface())[0]
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for _, pk := range deletingPrimaryKeys {
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if equalAsString(primaryKey, pk) {
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association.Field.Set(reflect.Zero(association.Field.Field.Type()))
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break
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}
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}
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}
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}
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return association
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}
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func (association *Association) Clear() *Association {
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return association.Replace()
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}
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func (association *Association) Count() int {
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count := -1
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relationship := association.Field.Relationship
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scope := association.Scope
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newScope := scope.New(association.Field.Field.Interface())
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if relationship.Kind == "many_to_many" {
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relationship.JoinTableHandler.JoinWith(relationship.JoinTableHandler, scope.NewDB(), association.Scope.Value).Table(newScope.TableName()).Count(&count)
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} else if relationship.Kind == "has_many" || relationship.Kind == "has_one" {
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query := scope.DB()
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for idx, foreignKey := range relationship.ForeignDBNames {
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if field, ok := scope.FieldByName(relationship.AssociationForeignDBNames[idx]); ok {
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query = query.Where(fmt.Sprintf("%v.%v = ?", newScope.QuotedTableName(), scope.Quote(foreignKey)),
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field.Field.Interface())
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}
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}
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if relationship.PolymorphicType != "" {
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query = query.Where(fmt.Sprintf("%v.%v = ?", newScope.QuotedTableName(), newScope.Quote(relationship.PolymorphicDBName)), scope.TableName())
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}
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query.Table(newScope.TableName()).Count(&count)
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} else if relationship.Kind == "belongs_to" {
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query := scope.DB()
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for idx, foreignKey := range relationship.ForeignDBNames {
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if field, ok := scope.FieldByName(relationship.AssociationForeignDBNames[idx]); ok {
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query = query.Where(fmt.Sprintf("%v.%v = ?", newScope.QuotedTableName(), scope.Quote(foreignKey)),
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field.Field.Interface())
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}
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}
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query.Table(newScope.TableName()).Count(&count)
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}
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return count
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}
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func (association *Association) getPrimaryKeys(columns []string, values ...interface{}) (results [][]interface{}) {
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scope := association.Scope
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for _, value := range values {
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reflectValue := reflect.Indirect(reflect.ValueOf(value))
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if reflectValue.Kind() == reflect.Slice {
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for i := 0; i < reflectValue.Len(); i++ {
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primaryKeys := []interface{}{}
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newScope := scope.New(reflectValue.Index(i).Interface())
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for _, column := range columns {
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if field, ok := newScope.FieldByName(column); ok {
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primaryKeys = append(primaryKeys, field.Field.Interface())
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} else {
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primaryKeys = append(primaryKeys, "")
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}
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}
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results = append(results, primaryKeys)
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}
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} else if reflectValue.Kind() == reflect.Struct {
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newScope := scope.New(value)
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var primaryKeys []interface{}
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for _, column := range columns {
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if field, ok := newScope.FieldByName(column); ok {
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primaryKeys = append(primaryKeys, field.Field.Interface())
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} else {
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primaryKeys = append(primaryKeys, "")
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}
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}
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results = append(results, primaryKeys)
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}
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}
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return
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}
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func toQueryMarks(primaryValues [][]interface{}) string {
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var results []string
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for _, primaryValue := range primaryValues {
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var marks []string
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for _, _ = range primaryValue {
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marks = append(marks, "?")
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}
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if len(marks) > 1 {
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results = append(results, fmt.Sprintf("(%v)", strings.Join(marks, ",")))
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} else {
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results = append(results, strings.Join(marks, ""))
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}
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}
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return strings.Join(results, ",")
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}
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func toQueryCondition(scope *Scope, columns []string) string {
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var newColumns []string
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for _, column := range columns {
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newColumns = append(newColumns, scope.Quote(column))
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}
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if len(columns) > 1 {
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return fmt.Sprintf("(%v)", strings.Join(newColumns, ","))
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} else {
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return strings.Join(newColumns, ",")
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}
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}
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func toQueryValues(primaryValues [][]interface{}) (values []interface{}) {
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for _, primaryValue := range primaryValues {
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for _, value := range primaryValue {
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values = append(values, value)
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}
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}
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return values
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}
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