adjust code for preload
This commit is contained in:
daheige
parent
c170af11e9
commit
e841ee0b7f
@ -26,82 +26,87 @@ func BeforeDelete(db *gorm.DB) {
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func DeleteBeforeAssociations(db *gorm.DB) {
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if db.Error == nil && db.Statement.Schema != nil {
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selectColumns, restricted := db.Statement.SelectAndOmitColumns(true, false)
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if !restricted {
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return
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}
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if restricted {
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for column, v := range selectColumns {
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if v {
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if rel, ok := db.Statement.Schema.Relationships.Relations[column]; ok {
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switch rel.Type {
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case schema.HasOne, schema.HasMany:
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queryConds := rel.ToQueryConditions(db.Statement.ReflectValue)
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modelValue := reflect.New(rel.FieldSchema.ModelType).Interface()
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tx := db.Session(&gorm.Session{NewDB: true}).Model(modelValue)
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withoutConditions := false
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if db.Statement.Unscoped {
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tx = tx.Unscoped()
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}
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for column, v := range selectColumns {
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if !v {
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continue
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}
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if len(db.Statement.Selects) > 0 {
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selects := make([]string, 0, len(db.Statement.Selects))
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for _, s := range db.Statement.Selects {
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if s == clause.Associations {
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selects = append(selects, s)
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} else if strings.HasPrefix(s, column+".") {
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selects = append(selects, strings.TrimPrefix(s, column+"."))
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}
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}
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rel, ok := db.Statement.Schema.Relationships.Relations[column]
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if !ok {
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continue
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}
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if len(selects) > 0 {
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tx = tx.Select(selects)
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}
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}
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switch rel.Type {
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case schema.HasOne, schema.HasMany:
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queryConds := rel.ToQueryConditions(db.Statement.ReflectValue)
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modelValue := reflect.New(rel.FieldSchema.ModelType).Interface()
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tx := db.Session(&gorm.Session{NewDB: true}).Model(modelValue)
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withoutConditions := false
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if db.Statement.Unscoped {
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tx = tx.Unscoped()
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}
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for _, cond := range queryConds {
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if c, ok := cond.(clause.IN); ok && len(c.Values) == 0 {
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withoutConditions = true
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break
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}
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}
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if !withoutConditions {
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if db.AddError(tx.Clauses(clause.Where{Exprs: queryConds}).Delete(modelValue).Error) != nil {
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return
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}
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}
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case schema.Many2Many:
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var (
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queryConds = make([]clause.Expression, 0, len(rel.References))
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foreignFields = make([]*schema.Field, 0, len(rel.References))
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relForeignKeys = make([]string, 0, len(rel.References))
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modelValue = reflect.New(rel.JoinTable.ModelType).Interface()
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table = rel.JoinTable.Table
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tx = db.Session(&gorm.Session{NewDB: true}).Model(modelValue).Table(table)
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)
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for _, ref := range rel.References {
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if ref.OwnPrimaryKey {
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foreignFields = append(foreignFields, ref.PrimaryKey)
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relForeignKeys = append(relForeignKeys, ref.ForeignKey.DBName)
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} else if ref.PrimaryValue != "" {
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queryConds = append(queryConds, clause.Eq{
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Column: clause.Column{Table: rel.JoinTable.Table, Name: ref.ForeignKey.DBName},
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Value: ref.PrimaryValue,
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})
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}
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}
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_, foreignValues := schema.GetIdentityFieldValuesMap(db.Statement.ReflectValue, foreignFields)
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column, values := schema.ToQueryValues(table, relForeignKeys, foreignValues)
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queryConds = append(queryConds, clause.IN{Column: column, Values: values})
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if db.AddError(tx.Clauses(clause.Where{Exprs: queryConds}).Delete(modelValue).Error) != nil {
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return
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}
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if len(db.Statement.Selects) > 0 {
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selects := make([]string, 0, len(db.Statement.Selects))
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for _, s := range db.Statement.Selects {
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if s == clause.Associations {
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selects = append(selects, s)
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} else if columnPrefix := column + "."; strings.HasPrefix(s, columnPrefix) {
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selects = append(selects, strings.TrimPrefix(s, columnPrefix))
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}
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}
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if len(selects) > 0 {
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tx = tx.Select(selects)
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}
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}
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for _, cond := range queryConds {
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if c, ok := cond.(clause.IN); ok && len(c.Values) == 0 {
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withoutConditions = true
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break
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}
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}
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if !withoutConditions && db.AddError(tx.Clauses(clause.Where{Exprs: queryConds}).Delete(modelValue).Error) != nil {
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return
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}
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case schema.Many2Many:
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var (
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queryConds = make([]clause.Expression, 0, len(rel.References))
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foreignFields = make([]*schema.Field, 0, len(rel.References))
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relForeignKeys = make([]string, 0, len(rel.References))
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modelValue = reflect.New(rel.JoinTable.ModelType).Interface()
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table = rel.JoinTable.Table
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tx = db.Session(&gorm.Session{NewDB: true}).Model(modelValue).Table(table)
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)
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for _, ref := range rel.References {
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if ref.OwnPrimaryKey {
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foreignFields = append(foreignFields, ref.PrimaryKey)
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relForeignKeys = append(relForeignKeys, ref.ForeignKey.DBName)
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} else if ref.PrimaryValue != "" {
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queryConds = append(queryConds, clause.Eq{
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Column: clause.Column{Table: rel.JoinTable.Table, Name: ref.ForeignKey.DBName},
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Value: ref.PrimaryValue,
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})
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}
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}
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_, foreignValues := schema.GetIdentityFieldValuesMap(db.Statement.ReflectValue, foreignFields)
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column, values := schema.ToQueryValues(table, relForeignKeys, foreignValues)
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queryConds = append(queryConds, clause.IN{Column: column, Values: values})
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if db.AddError(tx.Clauses(clause.Where{Exprs: queryConds}).Delete(modelValue).Error) != nil {
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return
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}
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}
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}
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}
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}
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@ -145,27 +145,30 @@ func preload(db *gorm.DB, rel *schema.Relationship, conds []interface{}, preload
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fieldValues[idx], _ = field.ValueOf(elem)
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}
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if datas, ok := identityMap[utils.ToStringKey(fieldValues...)]; ok {
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for _, data := range datas {
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reflectFieldValue := rel.Field.ReflectValueOf(data)
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if reflectFieldValue.Kind() == reflect.Ptr && reflectFieldValue.IsNil() {
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reflectFieldValue.Set(reflect.New(rel.Field.FieldType.Elem()))
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}
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datas, ok := identityMap[utils.ToStringKey(fieldValues...)]
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if !ok {
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db.AddError(fmt.Errorf("failed to assign association %#v, make sure foreign fields exists",
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elem.Interface()))
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continue
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}
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reflectFieldValue = reflect.Indirect(reflectFieldValue)
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switch reflectFieldValue.Kind() {
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case reflect.Struct:
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rel.Field.Set(data, reflectResults.Index(i).Interface())
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case reflect.Slice, reflect.Array:
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if reflectFieldValue.Type().Elem().Kind() == reflect.Ptr {
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rel.Field.Set(data, reflect.Append(reflectFieldValue, elem).Interface())
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} else {
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rel.Field.Set(data, reflect.Append(reflectFieldValue, elem.Elem()).Interface())
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}
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for _, data := range datas {
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reflectFieldValue := rel.Field.ReflectValueOf(data)
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if reflectFieldValue.Kind() == reflect.Ptr && reflectFieldValue.IsNil() {
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reflectFieldValue.Set(reflect.New(rel.Field.FieldType.Elem()))
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}
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reflectFieldValue = reflect.Indirect(reflectFieldValue)
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switch reflectFieldValue.Kind() {
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case reflect.Struct:
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rel.Field.Set(data, elem.Interface())
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case reflect.Slice, reflect.Array:
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if reflectFieldValue.Type().Elem().Kind() == reflect.Ptr {
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rel.Field.Set(data, reflect.Append(reflectFieldValue, elem).Interface())
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} else {
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rel.Field.Set(data, reflect.Append(reflectFieldValue, elem.Elem()).Interface())
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}
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}
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} else {
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db.AddError(fmt.Errorf("failed to assign association %#v, make sure foreign fields exists", elem.Interface()))
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}
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}
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}
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