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package gorm
import (
"errors"
"fmt"
"sort"
"strings"
)
// Define callbacks for updating
func init() {
DefaultCallback.Update().Register("gorm:assign_updating_attributes", assignUpdatingAttributesCallback)
DefaultCallback.Update().Register("gorm:begin_transaction", beginTransactionCallback)
DefaultCallback.Update().Register("gorm:before_update", beforeUpdateCallback)
DefaultCallback.Update().Register("gorm:save_before_associations", saveBeforeAssociationsCallback)
DefaultCallback.Update().Register("gorm:update_time_stamp", updateTimeStampForUpdateCallback)
DefaultCallback.Update().Register("gorm:update", updateCallback)
DefaultCallback.Update().Register("gorm:save_after_associations", saveAfterAssociationsCallback)
DefaultCallback.Update().Register("gorm:after_update", afterUpdateCallback)
DefaultCallback.Update().Register("gorm:commit_or_rollback_transaction", commitOrRollbackTransactionCallback)
}
// assignUpdatingAttributesCallback assign updating attributes to model
func assignUpdatingAttributesCallback(scope *Scope) {
if attrs, ok := scope.InstanceGet("gorm:update_interface"); ok {
if updateMaps, hasUpdate := scope.updatedAttrsWithValues(attrs); hasUpdate {
scope.InstanceSet("gorm:update_attrs", updateMaps)
} else {
scope.SkipLeft()
}
}
}
// beforeUpdateCallback will invoke `BeforeSave`, `BeforeUpdate` method before updating
func beforeUpdateCallback(scope *Scope) {
if scope.DB().HasBlockGlobalUpdate() && !scope.hasConditions() {
scope.Err(errors.New("Missing WHERE clause while updating"))
return
}
if _, ok := scope.Get("gorm:update_column"); !ok {
if !scope.HasError() {
scope.CallMethod("BeforeSave")
}
if !scope.HasError() {
scope.CallMethod("BeforeUpdate")
}
}
}
// updateTimeStampForUpdateCallback will set `UpdatedAt` when updating
func updateTimeStampForUpdateCallback(scope *Scope) {
if _, ok := scope.Get("gorm:update_column"); !ok {
scope.SetColumn("UpdatedAt", NowFunc())
}
}
// updateCallback the callback used to update data to database
func updateCallback(scope *Scope) {
if !scope.HasError() {
var sqls []string
if updateAttrs, ok := scope.InstanceGet("gorm:update_attrs"); ok {
// Sort the column names so that the generated SQL is the same every time.
updateMap := updateAttrs.(map[string]interface{})
var columns []string
for c := range updateMap {
columns = append(columns, c)
}
sort.Strings(columns)
for _, column := range columns {
value := updateMap[column]
sqls = append(sqls, fmt.Sprintf("%v = %v", scope.Quote(column), scope.AddToVars(value)))
}
} else {
for _, field := range scope.Fields() {
if scope.changeableField(field) {
if !field.IsPrimaryKey && field.IsNormal {
if !field.IsForeignKey || !field.IsBlank || !field.HasDefaultValue {
sqls = append(sqls, fmt.Sprintf("%v = %v", scope.Quote(field.DBName), scope.AddToVars(field.Field.Interface())))
}
} else if relationship := field.Relationship; relationship != nil && relationship.Kind == "belongs_to" {
for _, foreignKey := range relationship.ForeignDBNames {
if foreignField, ok := scope.FieldByName(foreignKey); ok && !scope.changeableField(foreignField) {
sqls = append(sqls,
fmt.Sprintf("%v = %v", scope.Quote(foreignField.DBName), scope.AddToVars(foreignField.Field.Interface())))
}
}
}
}
}
}
var extraOption string
if str, ok := scope.Get("gorm:update_option"); ok {
extraOption = fmt.Sprint(str)
}
if len(sqls) > 0 {
scope.Raw(fmt.Sprintf(
"UPDATE %v SET %v%v%v",
scope.QuotedTableName(),
strings.Join(sqls, ", "),
addExtraSpaceIfExist(scope.CombinedConditionSql()),
addExtraSpaceIfExist(extraOption),
)).Exec()
}
}
}
// afterUpdateCallback will invoke `AfterUpdate`, `AfterSave` method after updating
func afterUpdateCallback(scope *Scope) {
if _, ok := scope.Get("gorm:update_column"); !ok {
if !scope.HasError() {
scope.CallMethod("AfterUpdate")
}
if !scope.HasError() {
scope.CallMethod("AfterSave")
}
}
}