mirror of
https://codeberg.org/superseriousbusiness/gotosocial.git
synced 2024-12-23 17:40:20 +03:00
45 lines
1,015 B
Go
45 lines
1,015 B
Go
package schema
|
|
|
|
import (
|
|
"fmt"
|
|
)
|
|
|
|
const (
|
|
InvalidRelation = iota
|
|
HasOneRelation
|
|
BelongsToRelation
|
|
HasManyRelation
|
|
ManyToManyRelation
|
|
)
|
|
|
|
type Relation struct {
|
|
// Base and Join can be explained with this query:
|
|
//
|
|
// SELECT * FROM base_table JOIN join_table
|
|
|
|
Type int
|
|
Field *Field
|
|
JoinTable *Table
|
|
BasePKs []*Field
|
|
JoinPKs []*Field
|
|
OnUpdate string
|
|
OnDelete string
|
|
Condition []string
|
|
|
|
PolymorphicField *Field
|
|
PolymorphicValue string
|
|
|
|
M2MTable *Table
|
|
M2MBasePKs []*Field
|
|
M2MJoinPKs []*Field
|
|
}
|
|
|
|
// References returns true if the table to which the Relation belongs needs to declare a foreign key constraint to create the relation.
|
|
// For other relations, the constraint is created in either the referencing table (1:N, 'has-many' relations) or a mapping table (N:N, 'm2m' relations).
|
|
func (r *Relation) References() bool {
|
|
return r.Type == HasOneRelation || r.Type == BelongsToRelation
|
|
}
|
|
|
|
func (r *Relation) String() string {
|
|
return fmt.Sprintf("relation=%s", r.Field.GoName)
|
|
}
|