forked from mirror/gorm
124 lines
3.2 KiB
Go
124 lines
3.2 KiB
Go
package gorm
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import (
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"database/sql"
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"database/sql/driver"
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"encoding/json"
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"reflect"
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"gorm.io/gorm/clause"
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"gorm.io/gorm/schema"
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)
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type DeletedAt sql.NullTime
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// Scan implements the Scanner interface.
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func (n *DeletedAt) Scan(value interface{}) error {
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return (*sql.NullTime)(n).Scan(value)
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}
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// Value implements the driver Valuer interface.
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func (n DeletedAt) Value() (driver.Value, error) {
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if !n.Valid {
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return nil, nil
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}
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return n.Time, nil
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}
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func (n DeletedAt) MarshalJSON() ([]byte, error) {
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return json.Marshal(n.Time)
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}
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func (n *DeletedAt) UnmarshalJSON(b []byte) error {
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err := json.Unmarshal(b, &n.Time)
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if err == nil {
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n.Valid = true
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}
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return err
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}
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func (DeletedAt) QueryClauses(f *schema.Field) []clause.Interface {
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return []clause.Interface{SoftDeleteQueryClause{Field: f}}
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}
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type SoftDeleteQueryClause struct {
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Field *schema.Field
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}
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func (sd SoftDeleteQueryClause) Name() string {
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return ""
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}
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func (sd SoftDeleteQueryClause) Build(clause.Builder) {
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}
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func (sd SoftDeleteQueryClause) MergeClause(*clause.Clause) {
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}
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func (sd SoftDeleteQueryClause) ModifyStatement(stmt *Statement) {
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if _, ok := stmt.Clauses["soft_delete_enabled"]; !ok {
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if c, ok := stmt.Clauses["WHERE"]; ok {
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if where, ok := c.Expression.(clause.Where); ok && len(where.Exprs) > 1 {
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for _, expr := range where.Exprs {
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if orCond, ok := expr.(clause.OrConditions); ok && len(orCond.Exprs) == 1 {
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where.Exprs = []clause.Expression{clause.And(where.Exprs...)}
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c.Expression = where
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stmt.Clauses["WHERE"] = c
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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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stmt.AddClause(clause.Where{Exprs: []clause.Expression{
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clause.Eq{Column: clause.Column{Table: clause.CurrentTable, Name: sd.Field.DBName}, Value: nil},
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}})
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stmt.Clauses["soft_delete_enabled"] = clause.Clause{}
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}
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}
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func (DeletedAt) DeleteClauses(f *schema.Field) []clause.Interface {
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return []clause.Interface{SoftDeleteDeleteClause{Field: f}}
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}
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type SoftDeleteDeleteClause struct {
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Field *schema.Field
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}
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func (sd SoftDeleteDeleteClause) Name() string {
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return ""
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}
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func (sd SoftDeleteDeleteClause) Build(clause.Builder) {
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}
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func (sd SoftDeleteDeleteClause) MergeClause(*clause.Clause) {
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}
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func (sd SoftDeleteDeleteClause) ModifyStatement(stmt *Statement) {
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if stmt.SQL.String() == "" {
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stmt.AddClause(clause.Set{{Column: clause.Column{Name: sd.Field.DBName}, Value: stmt.DB.NowFunc()}})
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if stmt.Schema != nil {
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_, queryValues := schema.GetIdentityFieldValuesMap(stmt.ReflectValue, stmt.Schema.PrimaryFields)
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column, values := schema.ToQueryValues(stmt.Table, stmt.Schema.PrimaryFieldDBNames, queryValues)
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if len(values) > 0 {
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stmt.AddClause(clause.Where{Exprs: []clause.Expression{clause.IN{Column: column, Values: values}}})
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}
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if stmt.ReflectValue.CanAddr() && stmt.Dest != stmt.Model && stmt.Model != nil {
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_, queryValues = schema.GetIdentityFieldValuesMap(reflect.ValueOf(stmt.Model), stmt.Schema.PrimaryFields)
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column, values = schema.ToQueryValues(stmt.Table, stmt.Schema.PrimaryFieldDBNames, queryValues)
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if len(values) > 0 {
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stmt.AddClause(clause.Where{Exprs: []clause.Expression{clause.IN{Column: column, Values: values}}})
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}
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}
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}
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stmt.AddClauseIfNotExists(clause.Update{})
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stmt.Build("UPDATE", "SET", "WHERE")
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}
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}
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