mirror of https://github.com/go-gorm/gorm.git
372 lines
13 KiB
Go
372 lines
13 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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)
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// Association Mode contains some helper methods to handle relationship things easily.
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type Association struct {
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Error error
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scope *Scope
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column string
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field *Field
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}
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// Find find out all related associations
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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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// Append append new associations for many2many, has_many, replace current association for has_one, belongs_to
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func (association *Association) Append(values ...interface{}) *Association {
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if association.Error != nil {
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return association
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}
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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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// Replace replace current associations with new one
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func (association *Association) Replace(values ...interface{}) *Association {
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if association.Error != nil {
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return association
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}
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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 when clearing value (length equals 0)
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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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// Polymorphic Relations
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if relationship.PolymorphicDBName != "" {
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newDB = newDB.Where(fmt.Sprintf("%v = ?", scope.Quote(relationship.PolymorphicDBName)), relationship.PolymorphicValue)
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}
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// Delete Relations except new created
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if len(values) > 0 {
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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 association fields name from association foreign keys
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associationScope := scope.New(reflect.New(field.Type()).Interface())
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for _, dbName := range relationship.AssociationForeignFieldNames {
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if field, ok := associationScope.FieldByName(dbName); ok {
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associationForeignFieldNames = append(associationForeignFieldNames, field.Name)
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}
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}
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} else {
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// If other relations, use primary keys
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for _, field := range scope.New(reflect.New(field.Type()).Interface()).PrimaryFields() {
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associationForeignFieldNames = append(associationForeignFieldNames, field.Name)
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}
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}
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newPrimaryKeys := scope.getColumnAsArray(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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// if many to many relations, delete related relations from join table
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var sourceForeignFieldNames []string
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for _, dbName := range relationship.ForeignFieldNames {
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if field, ok := scope.FieldByName(dbName); ok {
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sourceForeignFieldNames = append(sourceForeignFieldNames, field.Name)
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}
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}
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if sourcePrimaryKeys := scope.getColumnAsArray(sourceForeignFieldNames, scope.Value); len(sourcePrimaryKeys) > 0 {
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newDB = newDB.Where(fmt.Sprintf("%v IN (%v)", toQueryCondition(scope, relationship.ForeignDBNames), toQueryMarks(sourcePrimaryKeys)), toQueryValues(sourcePrimaryKeys)...)
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association.setErr(relationship.JoinTableHandler.Delete(relationship.JoinTableHandler, newDB, relationship))
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}
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} else if relationship.Kind == "has_one" || relationship.Kind == "has_many" {
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// has_one or has_many relations, set foreign key to be nil (TODO or delete them?)
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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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// Delete remove relationship between source & passed arguments, but won't delete those arguments
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func (association *Association) Delete(values ...interface{}) *Association {
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if association.Error != nil {
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return association
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}
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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()).PrimaryFields() {
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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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deletingPrimaryKeys := scope.getColumnAsArray(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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// get association's foreign fields name
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var associationScope = scope.New(reflect.New(field.Type()).Interface())
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var associationForeignFieldNames []string
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for _, associationDBName := range relationship.AssociationForeignFieldNames {
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if field, ok := associationScope.FieldByName(associationDBName); ok {
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associationForeignFieldNames = append(associationForeignFieldNames, field.Name)
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}
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}
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// association value's foreign keys
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deletingPrimaryKeys := scope.getColumnAsArray(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 := scope.getColumnAsArray(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 if there are some records affected
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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)
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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 := scope.getColumnAsArray(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 source's field
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if association.Error == nil {
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if field.Kind() == reflect.Slice {
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leftValues := reflect.Zero(field.Type())
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for i := 0; i < field.Len(); i++ {
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reflectValue := field.Index(i)
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primaryKey := scope.getColumnAsArray(deletingResourcePrimaryFieldNames, reflectValue.Interface())[0]
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var isDeleted = false
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for _, pk := range deletingPrimaryKeys {
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if equalAsString(primaryKey, pk) {
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isDeleted = true
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break
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}
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}
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if !isDeleted {
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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 field.Kind() == reflect.Struct {
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primaryKey := scope.getColumnAsArray(deletingResourcePrimaryFieldNames, 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(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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// Clear remove relationship between source & current associations, won't delete those associations
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func (association *Association) Clear() *Association {
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return association.Replace()
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}
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// Count return the count of current associations
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func (association *Association) Count() int {
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var (
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count = 0
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relationship = association.field.Relationship
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scope = association.scope
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fieldValue = association.field.Field.Interface()
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query = scope.DB()
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)
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if relationship.Kind == "many_to_many" {
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query = relationship.JoinTableHandler.JoinWith(relationship.JoinTableHandler, query, scope.Value)
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} else if relationship.Kind == "has_many" || relationship.Kind == "has_one" {
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primaryKeys := scope.getColumnAsArray(relationship.AssociationForeignFieldNames, scope.Value)
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query = query.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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} else if relationship.Kind == "belongs_to" {
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primaryKeys := scope.getColumnAsArray(relationship.ForeignFieldNames, scope.Value)
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query = query.Where(
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fmt.Sprintf("%v IN (%v)", toQueryCondition(scope, relationship.AssociationForeignDBNames), toQueryMarks(primaryKeys)),
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toQueryValues(primaryKeys)...,
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)
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}
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if relationship.PolymorphicType != "" {
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query = query.Where(
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fmt.Sprintf("%v.%v = ?", scope.New(fieldValue).QuotedTableName(), scope.Quote(relationship.PolymorphicDBName)),
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relationship.PolymorphicValue,
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)
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}
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query.Model(fieldValue).Count(&count)
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return count
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}
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// saveAssociations save passed values as associations
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func (association *Association) saveAssociations(values ...interface{}) *Association {
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var (
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scope = association.scope
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field = association.field
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relationship = field.Relationship
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)
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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) 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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