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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)
}
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