| 52 | } |
| 53 | |
| 54 | func (db *DB) scanIntoStruct(rows Rows, reflectValue reflect.Value, values []interface{}, fields []*schema.Field, joinFields [][]*schema.Field) { |
| 55 | for idx, field := range fields { |
| 56 | if field != nil { |
| 57 | values[idx] = field.NewValuePool.Get() |
| 58 | } else if len(fields) == 1 { |
| 59 | if reflectValue.CanAddr() { |
| 60 | values[idx] = reflectValue.Addr().Interface() |
| 61 | } else { |
| 62 | values[idx] = reflectValue.Interface() |
| 63 | } |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | db.RowsAffected++ |
| 68 | db.AddError(rows.Scan(values...)) |
| 69 | joinedNestedSchemaMap := make(map[string]interface{}) |
| 70 | for idx, field := range fields { |
| 71 | if field == nil { |
| 72 | continue |
| 73 | } |
| 74 | |
| 75 | if len(joinFields) == 0 || len(joinFields[idx]) == 0 { |
| 76 | db.AddError(field.Set(db.Statement.Context, reflectValue, values[idx])) |
| 77 | } else { // joinFields count is larger than 2 when using join |
| 78 | var isNilPtrValue bool |
| 79 | var relValue reflect.Value |
| 80 | // does not contain raw dbname |
| 81 | nestedJoinSchemas := joinFields[idx][:len(joinFields[idx])-1] |
| 82 | // current reflect value |
| 83 | currentReflectValue := reflectValue |
| 84 | fullRels := make([]string, 0, len(nestedJoinSchemas)) |
| 85 | for _, joinSchema := range nestedJoinSchemas { |
| 86 | fullRels = append(fullRels, joinSchema.Name) |
| 87 | relValue = joinSchema.ReflectValueOf(db.Statement.Context, currentReflectValue) |
| 88 | if relValue.Kind() == reflect.Ptr { |
| 89 | fullRelsName := utils.JoinNestedRelationNames(fullRels) |
| 90 | // same nested structure |
| 91 | if _, ok := joinedNestedSchemaMap[fullRelsName]; !ok { |
| 92 | if value := reflect.ValueOf(values[idx]).Elem(); value.Kind() == reflect.Ptr && value.IsNil() { |
| 93 | isNilPtrValue = true |
| 94 | break |
| 95 | } |
| 96 | |
| 97 | relValue.Set(reflect.New(relValue.Type().Elem())) |
| 98 | joinedNestedSchemaMap[fullRelsName] = nil |
| 99 | } |
| 100 | } |
| 101 | currentReflectValue = relValue |
| 102 | } |
| 103 | |
| 104 | if !isNilPtrValue { // ignore if value is nil |
| 105 | f := joinFields[idx][len(joinFields[idx])-1] |
| 106 | db.AddError(f.Set(db.Statement.Context, relValue, values[idx])) |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | // release data to pool |
| 111 | field.NewValuePool.Put(values[idx]) |