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adjust code for preload

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This commit is contained in:
daheige 2021-11-03 21:33:37 +08:00
parent c170af11e9
commit e841ee0b7f
2 changed files with 93 additions and 85 deletions
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27
callbacks/delete.go
View File

@ -26,11 +26,20 @@ func BeforeDelete(db *gorm.DB) {
func DeleteBeforeAssociations(db *gorm.DB) {
if db.Error == nil && db.Statement.Schema != nil {
selectColumns, restricted := db.Statement.SelectAndOmitColumns(true, false)
if !restricted {
return
}
if restricted {
for column, v := range selectColumns {
if v {
if rel, ok := db.Statement.Schema.Relationships.Relations[column]; ok {
if !v {
continue
}
rel, ok := db.Statement.Schema.Relationships.Relations[column]
if !ok {
continue
}
switch rel.Type {
case schema.HasOne, schema.HasMany:
queryConds := rel.ToQueryConditions(db.Statement.ReflectValue)
@ -46,8 +55,8 @@ func DeleteBeforeAssociations(db *gorm.DB) {
for _, s := range db.Statement.Selects {
if s == clause.Associations {
selects = append(selects, s)
} else if strings.HasPrefix(s, column+".") {
selects = append(selects, strings.TrimPrefix(s, column+"."))
} else if columnPrefix := column + "."; strings.HasPrefix(s, columnPrefix) {
selects = append(selects, strings.TrimPrefix(s, columnPrefix))
}
}
@ -63,11 +72,9 @@ func DeleteBeforeAssociations(db *gorm.DB) {
}
}
if !withoutConditions {
if db.AddError(tx.Clauses(clause.Where{Exprs: queryConds}).Delete(modelValue).Error) != nil {
if !withoutConditions && db.AddError(tx.Clauses(clause.Where{Exprs: queryConds}).Delete(modelValue).Error) != nil {
return
}
}
case schema.Many2Many:
var (
queryConds = make([]clause.Expression, 0, len(rel.References))
@ -99,9 +106,7 @@ func DeleteBeforeAssociations(db *gorm.DB) {
}
}
}
}
}
}
}
}

13
callbacks/preload.go
View File

@ -145,7 +145,13 @@ func preload(db *gorm.DB, rel *schema.Relationship, conds []interface{}, preload
fieldValues[idx], _ = field.ValueOf(elem)
}
if datas, ok := identityMap[utils.ToStringKey(fieldValues...)]; ok {
datas, ok := identityMap[utils.ToStringKey(fieldValues...)]
if !ok {
db.AddError(fmt.Errorf("failed to assign association %#v, make sure foreign fields exists",
elem.Interface()))
continue
}
for _, data := range datas {
reflectFieldValue := rel.Field.ReflectValueOf(data)
if reflectFieldValue.Kind() == reflect.Ptr && reflectFieldValue.IsNil() {
@ -155,7 +161,7 @@ func preload(db *gorm.DB, rel *schema.Relationship, conds []interface{}, preload
reflectFieldValue = reflect.Indirect(reflectFieldValue)
switch reflectFieldValue.Kind() {
case reflect.Struct:
rel.Field.Set(data, reflectResults.Index(i).Interface())
rel.Field.Set(data, elem.Interface())
case reflect.Slice, reflect.Array:
if reflectFieldValue.Type().Elem().Kind() == reflect.Ptr {
rel.Field.Set(data, reflect.Append(reflectFieldValue, elem).Interface())
@ -164,8 +170,5 @@ func preload(db *gorm.DB, rel *schema.Relationship, conds []interface{}, preload
}
}
}
} else {
db.AddError(fmt.Errorf("failed to assign association %#v, make sure foreign fields exists", elem.Interface()))
}
}
}