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45 lines
1,015 B
Go
45 lines
1,015 B
Go
package schema
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import (
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"fmt"
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)
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const (
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InvalidRelation = iota
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HasOneRelation
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BelongsToRelation
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HasManyRelation
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ManyToManyRelation
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)
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type Relation struct {
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// Base and Join can be explained with this query:
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//
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// SELECT * FROM base_table JOIN join_table
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Type int
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Field *Field
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JoinTable *Table
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BasePKs []*Field
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JoinPKs []*Field
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OnUpdate string
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OnDelete string
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Condition []string
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PolymorphicField *Field
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PolymorphicValue string
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M2MTable *Table
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M2MBasePKs []*Field
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M2MJoinPKs []*Field
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}
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// References returns true if the table to which the Relation belongs needs to declare a foreign key constraint to create the relation.
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// 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).
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func (r *Relation) References() bool {
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return r.Type == HasOneRelation || r.Type == BelongsToRelation
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}
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func (r *Relation) String() string {
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return fmt.Sprintf("relation=%s", r.Field.GoName)
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}
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