mirror of https://github.com/go-gorm/gorm.git
523 lines
19 KiB
Go
523 lines
19 KiB
Go
package gorm
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import (
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"fmt"
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"reflect"
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"strings"
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"gorm.io/gorm/clause"
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"gorm.io/gorm/schema"
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"gorm.io/gorm/utils"
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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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DB *DB
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Relationship *schema.Relationship
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Error error
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}
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func (db *DB) Association(column string) *Association {
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association := &Association{DB: db}
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table := db.Statement.Table
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if err := db.Statement.Parse(db.Statement.Model); err == nil {
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db.Statement.Table = table
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association.Relationship = db.Statement.Schema.Relationships.Relations[column]
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if association.Relationship == nil {
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association.Error = fmt.Errorf("%w: %s", ErrUnsupportedRelation, column)
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}
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db.Statement.ReflectValue = reflect.ValueOf(db.Statement.Model)
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for db.Statement.ReflectValue.Kind() == reflect.Ptr {
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db.Statement.ReflectValue = db.Statement.ReflectValue.Elem()
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}
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} else {
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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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func (association *Association) Find(out interface{}, conds ...interface{}) error {
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if association.Error == nil {
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association.Error = association.buildCondition().Find(out, conds...).Error
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}
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return association.Error
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}
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func (association *Association) Append(values ...interface{}) error {
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if association.Error == nil {
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switch association.Relationship.Type {
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case schema.HasOne, schema.BelongsTo:
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if len(values) > 0 {
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association.Error = association.Replace(values...)
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}
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default:
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association.saveAssociation( /*clear*/ false, values...)
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}
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}
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return association.Error
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}
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func (association *Association) Replace(values ...interface{}) error {
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if association.Error == nil {
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// save associations
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if association.saveAssociation( /*clear*/ true, values...); association.Error != nil {
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return association.Error
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}
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// set old associations's foreign key to null
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reflectValue := association.DB.Statement.ReflectValue
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rel := association.Relationship
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switch rel.Type {
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case schema.BelongsTo:
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if len(values) == 0 {
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updateMap := map[string]interface{}{}
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switch reflectValue.Kind() {
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case reflect.Slice, reflect.Array:
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for i := 0; i < reflectValue.Len(); i++ {
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association.Error = rel.Field.Set(association.DB.Statement.Context, reflectValue.Index(i), reflect.Zero(rel.Field.FieldType).Interface())
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}
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case reflect.Struct:
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association.Error = rel.Field.Set(association.DB.Statement.Context, reflectValue, reflect.Zero(rel.Field.FieldType).Interface())
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}
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for _, ref := range rel.References {
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updateMap[ref.ForeignKey.DBName] = nil
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}
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association.Error = association.DB.UpdateColumns(updateMap).Error
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}
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case schema.HasOne, schema.HasMany:
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var (
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primaryFields []*schema.Field
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foreignKeys []string
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updateMap = map[string]interface{}{}
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relValues = schema.GetRelationsValues(association.DB.Statement.Context, reflectValue, []*schema.Relationship{rel})
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modelValue = reflect.New(rel.FieldSchema.ModelType).Interface()
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tx = association.DB.Model(modelValue)
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)
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if _, rvs := schema.GetIdentityFieldValuesMap(association.DB.Statement.Context, relValues, rel.FieldSchema.PrimaryFields); len(rvs) > 0 {
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if column, values := schema.ToQueryValues(rel.FieldSchema.Table, rel.FieldSchema.PrimaryFieldDBNames, rvs); len(values) > 0 {
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tx.Not(clause.IN{Column: column, Values: values})
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}
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}
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for _, ref := range rel.References {
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if ref.OwnPrimaryKey {
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primaryFields = append(primaryFields, ref.PrimaryKey)
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foreignKeys = append(foreignKeys, ref.ForeignKey.DBName)
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updateMap[ref.ForeignKey.DBName] = nil
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} else if ref.PrimaryValue != "" {
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tx.Where(clause.Eq{Column: ref.ForeignKey.DBName, Value: ref.PrimaryValue})
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}
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}
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if _, pvs := schema.GetIdentityFieldValuesMap(association.DB.Statement.Context, reflectValue, primaryFields); len(pvs) > 0 {
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column, values := schema.ToQueryValues(rel.FieldSchema.Table, foreignKeys, pvs)
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association.Error = tx.Where(clause.IN{Column: column, Values: values}).UpdateColumns(updateMap).Error
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}
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case schema.Many2Many:
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var (
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primaryFields, relPrimaryFields []*schema.Field
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joinPrimaryKeys, joinRelPrimaryKeys []string
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modelValue = reflect.New(rel.JoinTable.ModelType).Interface()
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tx = association.DB.Model(modelValue)
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)
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for _, ref := range rel.References {
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if ref.PrimaryValue == "" {
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if ref.OwnPrimaryKey {
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primaryFields = append(primaryFields, ref.PrimaryKey)
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joinPrimaryKeys = append(joinPrimaryKeys, ref.ForeignKey.DBName)
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} else {
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relPrimaryFields = append(relPrimaryFields, ref.PrimaryKey)
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joinRelPrimaryKeys = append(joinRelPrimaryKeys, ref.ForeignKey.DBName)
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}
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} else {
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tx.Clauses(clause.Eq{Column: ref.ForeignKey.DBName, Value: ref.PrimaryValue})
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}
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}
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_, pvs := schema.GetIdentityFieldValuesMap(association.DB.Statement.Context, reflectValue, primaryFields)
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if column, values := schema.ToQueryValues(rel.JoinTable.Table, joinPrimaryKeys, pvs); len(values) > 0 {
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tx.Where(clause.IN{Column: column, Values: values})
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} else {
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return ErrPrimaryKeyRequired
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}
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_, rvs := schema.GetIdentityFieldValuesMapFromValues(association.DB.Statement.Context, values, relPrimaryFields)
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if relColumn, relValues := schema.ToQueryValues(rel.JoinTable.Table, joinRelPrimaryKeys, rvs); len(relValues) > 0 {
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tx.Where(clause.Not(clause.IN{Column: relColumn, Values: relValues}))
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}
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association.Error = tx.Delete(modelValue).Error
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}
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}
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return association.Error
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}
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func (association *Association) Delete(values ...interface{}) error {
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if association.Error == nil {
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var (
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reflectValue = association.DB.Statement.ReflectValue
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rel = association.Relationship
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primaryFields []*schema.Field
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foreignKeys []string
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updateAttrs = map[string]interface{}{}
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conds []clause.Expression
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)
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for _, ref := range rel.References {
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if ref.PrimaryValue == "" {
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primaryFields = append(primaryFields, ref.PrimaryKey)
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foreignKeys = append(foreignKeys, ref.ForeignKey.DBName)
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updateAttrs[ref.ForeignKey.DBName] = nil
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} else {
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conds = append(conds, clause.Eq{Column: ref.ForeignKey.DBName, Value: ref.PrimaryValue})
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}
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}
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switch rel.Type {
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case schema.BelongsTo:
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tx := association.DB.Model(reflect.New(rel.Schema.ModelType).Interface())
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_, pvs := schema.GetIdentityFieldValuesMap(association.DB.Statement.Context, reflectValue, rel.Schema.PrimaryFields)
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if pcolumn, pvalues := schema.ToQueryValues(rel.Schema.Table, rel.Schema.PrimaryFieldDBNames, pvs); len(pvalues) > 0 {
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conds = append(conds, clause.IN{Column: pcolumn, Values: pvalues})
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} else {
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return ErrPrimaryKeyRequired
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}
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_, rvs := schema.GetIdentityFieldValuesMapFromValues(association.DB.Statement.Context, values, primaryFields)
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relColumn, relValues := schema.ToQueryValues(rel.Schema.Table, foreignKeys, rvs)
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conds = append(conds, clause.IN{Column: relColumn, Values: relValues})
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association.Error = tx.Clauses(conds...).UpdateColumns(updateAttrs).Error
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case schema.HasOne, schema.HasMany:
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tx := association.DB.Model(reflect.New(rel.FieldSchema.ModelType).Interface())
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_, pvs := schema.GetIdentityFieldValuesMap(association.DB.Statement.Context, reflectValue, primaryFields)
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if pcolumn, pvalues := schema.ToQueryValues(rel.FieldSchema.Table, foreignKeys, pvs); len(pvalues) > 0 {
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conds = append(conds, clause.IN{Column: pcolumn, Values: pvalues})
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} else {
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return ErrPrimaryKeyRequired
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}
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_, rvs := schema.GetIdentityFieldValuesMapFromValues(association.DB.Statement.Context, values, rel.FieldSchema.PrimaryFields)
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relColumn, relValues := schema.ToQueryValues(rel.FieldSchema.Table, rel.FieldSchema.PrimaryFieldDBNames, rvs)
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conds = append(conds, clause.IN{Column: relColumn, Values: relValues})
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association.Error = tx.Clauses(conds...).UpdateColumns(updateAttrs).Error
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case schema.Many2Many:
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var (
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primaryFields, relPrimaryFields []*schema.Field
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joinPrimaryKeys, joinRelPrimaryKeys []string
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joinValue = reflect.New(rel.JoinTable.ModelType).Interface()
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)
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for _, ref := range rel.References {
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if ref.PrimaryValue == "" {
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if ref.OwnPrimaryKey {
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primaryFields = append(primaryFields, ref.PrimaryKey)
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joinPrimaryKeys = append(joinPrimaryKeys, ref.ForeignKey.DBName)
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} else {
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relPrimaryFields = append(relPrimaryFields, ref.PrimaryKey)
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joinRelPrimaryKeys = append(joinRelPrimaryKeys, ref.ForeignKey.DBName)
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}
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} else {
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conds = append(conds, clause.Eq{Column: ref.ForeignKey.DBName, Value: ref.PrimaryValue})
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}
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}
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_, pvs := schema.GetIdentityFieldValuesMap(association.DB.Statement.Context, reflectValue, primaryFields)
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if pcolumn, pvalues := schema.ToQueryValues(rel.JoinTable.Table, joinPrimaryKeys, pvs); len(pvalues) > 0 {
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conds = append(conds, clause.IN{Column: pcolumn, Values: pvalues})
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} else {
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return ErrPrimaryKeyRequired
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}
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_, rvs := schema.GetIdentityFieldValuesMapFromValues(association.DB.Statement.Context, values, relPrimaryFields)
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relColumn, relValues := schema.ToQueryValues(rel.JoinTable.Table, joinRelPrimaryKeys, rvs)
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conds = append(conds, clause.IN{Column: relColumn, Values: relValues})
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association.Error = association.DB.Where(clause.Where{Exprs: conds}).Model(nil).Delete(joinValue).Error
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}
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if association.Error == nil {
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// clean up deleted values's foreign key
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relValuesMap, _ := schema.GetIdentityFieldValuesMapFromValues(association.DB.Statement.Context, values, rel.FieldSchema.PrimaryFields)
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cleanUpDeletedRelations := func(data reflect.Value) {
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if _, zero := rel.Field.ValueOf(association.DB.Statement.Context, data); !zero {
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fieldValue := reflect.Indirect(rel.Field.ReflectValueOf(association.DB.Statement.Context, data))
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primaryValues := make([]interface{}, len(rel.FieldSchema.PrimaryFields))
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switch fieldValue.Kind() {
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case reflect.Slice, reflect.Array:
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validFieldValues := reflect.Zero(rel.Field.IndirectFieldType)
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for i := 0; i < fieldValue.Len(); i++ {
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for idx, field := range rel.FieldSchema.PrimaryFields {
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primaryValues[idx], _ = field.ValueOf(association.DB.Statement.Context, fieldValue.Index(i))
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}
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if _, ok := relValuesMap[utils.ToStringKey(primaryValues...)]; !ok {
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validFieldValues = reflect.Append(validFieldValues, fieldValue.Index(i))
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}
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}
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association.Error = rel.Field.Set(association.DB.Statement.Context, data, validFieldValues.Interface())
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case reflect.Struct:
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for idx, field := range rel.FieldSchema.PrimaryFields {
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primaryValues[idx], _ = field.ValueOf(association.DB.Statement.Context, fieldValue)
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}
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if _, ok := relValuesMap[utils.ToStringKey(primaryValues...)]; ok {
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if association.Error = rel.Field.Set(association.DB.Statement.Context, data, reflect.Zero(rel.FieldSchema.ModelType).Interface()); association.Error != nil {
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break
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}
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if rel.JoinTable == nil {
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for _, ref := range rel.References {
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if ref.OwnPrimaryKey || ref.PrimaryValue != "" {
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association.Error = ref.ForeignKey.Set(association.DB.Statement.Context, fieldValue, reflect.Zero(ref.ForeignKey.FieldType).Interface())
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} else {
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association.Error = ref.ForeignKey.Set(association.DB.Statement.Context, data, reflect.Zero(ref.ForeignKey.FieldType).Interface())
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}
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}
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}
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}
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}
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}
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}
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switch reflectValue.Kind() {
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case reflect.Slice, reflect.Array:
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for i := 0; i < reflectValue.Len(); i++ {
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cleanUpDeletedRelations(reflect.Indirect(reflectValue.Index(i)))
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}
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case reflect.Struct:
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cleanUpDeletedRelations(reflectValue)
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}
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}
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}
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return association.Error
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}
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func (association *Association) Clear() error {
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return association.Replace()
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}
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func (association *Association) Count() (count int64) {
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if association.Error == nil {
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association.Error = association.buildCondition().Count(&count).Error
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}
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return
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}
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type assignBack struct {
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Source reflect.Value
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Index int
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Dest reflect.Value
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}
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func (association *Association) saveAssociation(clear bool, values ...interface{}) {
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var (
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reflectValue = association.DB.Statement.ReflectValue
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assignBacks []assignBack // assign association values back to arguments after save
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)
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appendToRelations := func(source, rv reflect.Value, clear bool) {
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switch association.Relationship.Type {
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case schema.HasOne, schema.BelongsTo:
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switch rv.Kind() {
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case reflect.Slice, reflect.Array:
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if rv.Len() > 0 {
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association.Error = association.Relationship.Field.Set(association.DB.Statement.Context, source, rv.Index(0).Addr().Interface())
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if association.Relationship.Field.FieldType.Kind() == reflect.Struct {
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assignBacks = append(assignBacks, assignBack{Source: source, Dest: rv.Index(0)})
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}
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}
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case reflect.Struct:
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association.Error = association.Relationship.Field.Set(association.DB.Statement.Context, source, rv.Addr().Interface())
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if association.Relationship.Field.FieldType.Kind() == reflect.Struct {
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assignBacks = append(assignBacks, assignBack{Source: source, Dest: rv})
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}
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}
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case schema.HasMany, schema.Many2Many:
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elemType := association.Relationship.Field.IndirectFieldType.Elem()
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fieldValue := reflect.Indirect(association.Relationship.Field.ReflectValueOf(association.DB.Statement.Context, source))
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if clear {
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fieldValue = reflect.New(association.Relationship.Field.IndirectFieldType).Elem()
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}
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appendToFieldValues := func(ev reflect.Value) {
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if ev.Type().AssignableTo(elemType) {
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fieldValue = reflect.Append(fieldValue, ev)
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} else if ev.Type().Elem().AssignableTo(elemType) {
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fieldValue = reflect.Append(fieldValue, ev.Elem())
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} else {
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association.Error = fmt.Errorf("unsupported data type: %v for relation %s", ev.Type(), association.Relationship.Name)
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}
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if elemType.Kind() == reflect.Struct {
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assignBacks = append(assignBacks, assignBack{Source: source, Dest: ev, Index: fieldValue.Len()})
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}
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}
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switch rv.Kind() {
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case reflect.Slice, reflect.Array:
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for i := 0; i < rv.Len(); i++ {
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appendToFieldValues(reflect.Indirect(rv.Index(i)).Addr())
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}
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case reflect.Struct:
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appendToFieldValues(rv.Addr())
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}
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if association.Error == nil {
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association.Error = association.Relationship.Field.Set(association.DB.Statement.Context, source, fieldValue.Interface())
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}
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}
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}
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selectedSaveColumns := []string{association.Relationship.Name}
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omitColumns := []string{}
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selectColumns, _ := association.DB.Statement.SelectAndOmitColumns(true, false)
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for name, ok := range selectColumns {
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columnName := ""
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if strings.HasPrefix(name, association.Relationship.Name) {
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if columnName = strings.TrimPrefix(name, association.Relationship.Name); columnName == ".*" {
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columnName = name
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}
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} else if strings.HasPrefix(name, clause.Associations) {
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columnName = name
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}
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if columnName != "" {
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if ok {
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selectedSaveColumns = append(selectedSaveColumns, columnName)
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} else {
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omitColumns = append(omitColumns, columnName)
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}
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}
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}
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for _, ref := range association.Relationship.References {
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if !ref.OwnPrimaryKey {
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selectedSaveColumns = append(selectedSaveColumns, ref.ForeignKey.Name)
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}
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}
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associationDB := association.DB.Session(&Session{}).Model(nil)
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if !association.DB.FullSaveAssociations {
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associationDB.Select(selectedSaveColumns)
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}
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if len(omitColumns) > 0 {
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associationDB.Omit(omitColumns...)
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}
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associationDB = associationDB.Session(&Session{})
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switch reflectValue.Kind() {
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case reflect.Slice, reflect.Array:
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if len(values) != reflectValue.Len() {
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// clear old data
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if clear && len(values) == 0 {
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for i := 0; i < reflectValue.Len(); i++ {
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if err := association.Relationship.Field.Set(association.DB.Statement.Context, reflectValue.Index(i), reflect.New(association.Relationship.Field.IndirectFieldType).Interface()); err != nil {
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association.Error = err
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break
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}
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if association.Relationship.JoinTable == nil {
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for _, ref := range association.Relationship.References {
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if !ref.OwnPrimaryKey && ref.PrimaryValue == "" {
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if err := ref.ForeignKey.Set(association.DB.Statement.Context, reflectValue.Index(i), reflect.Zero(ref.ForeignKey.FieldType).Interface()); err != nil {
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association.Error = err
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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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}
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break
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}
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association.Error = ErrInvalidValueOfLength
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return
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}
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for i := 0; i < reflectValue.Len(); i++ {
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appendToRelations(reflectValue.Index(i), reflect.Indirect(reflect.ValueOf(values[i])), clear)
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// TODO support save slice data, sql with case?
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association.Error = associationDB.Updates(reflectValue.Index(i).Addr().Interface()).Error
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}
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case reflect.Struct:
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// clear old data
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if clear && len(values) == 0 {
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association.Error = association.Relationship.Field.Set(association.DB.Statement.Context, reflectValue, reflect.New(association.Relationship.Field.IndirectFieldType).Interface())
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if association.Relationship.JoinTable == nil && association.Error == nil {
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for _, ref := range association.Relationship.References {
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if !ref.OwnPrimaryKey && ref.PrimaryValue == "" {
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association.Error = ref.ForeignKey.Set(association.DB.Statement.Context, reflectValue, reflect.Zero(ref.ForeignKey.FieldType).Interface())
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}
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}
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}
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}
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for idx, value := range values {
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rv := reflect.Indirect(reflect.ValueOf(value))
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appendToRelations(reflectValue, rv, clear && idx == 0)
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}
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|
if len(values) > 0 {
|
|
association.Error = associationDB.Updates(reflectValue.Addr().Interface()).Error
|
|
}
|
|
}
|
|
|
|
for _, assignBack := range assignBacks {
|
|
fieldValue := reflect.Indirect(association.Relationship.Field.ReflectValueOf(association.DB.Statement.Context, assignBack.Source))
|
|
if assignBack.Index > 0 {
|
|
reflect.Indirect(assignBack.Dest).Set(fieldValue.Index(assignBack.Index - 1))
|
|
} else {
|
|
reflect.Indirect(assignBack.Dest).Set(fieldValue)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (association *Association) buildCondition() *DB {
|
|
var (
|
|
queryConds = association.Relationship.ToQueryConditions(association.DB.Statement.Context, association.DB.Statement.ReflectValue)
|
|
modelValue = reflect.New(association.Relationship.FieldSchema.ModelType).Interface()
|
|
tx = association.DB.Model(modelValue)
|
|
)
|
|
|
|
if association.Relationship.JoinTable != nil {
|
|
if !tx.Statement.Unscoped && len(association.Relationship.JoinTable.QueryClauses) > 0 {
|
|
joinStmt := Statement{DB: tx, Schema: association.Relationship.JoinTable, Table: association.Relationship.JoinTable.Table, Clauses: map[string]clause.Clause{}}
|
|
for _, queryClause := range association.Relationship.JoinTable.QueryClauses {
|
|
joinStmt.AddClause(queryClause)
|
|
}
|
|
joinStmt.Build("WHERE")
|
|
tx.Clauses(clause.Expr{SQL: strings.Replace(joinStmt.SQL.String(), "WHERE ", "", 1), Vars: joinStmt.Vars})
|
|
}
|
|
|
|
tx = tx.Session(&Session{QueryFields: true}).Clauses(clause.From{Joins: []clause.Join{{
|
|
Table: clause.Table{Name: association.Relationship.JoinTable.Table},
|
|
ON: clause.Where{Exprs: queryConds},
|
|
}}})
|
|
} else {
|
|
tx.Clauses(clause.Where{Exprs: queryConds})
|
|
}
|
|
|
|
return tx
|
|
}
|