Method buildMany2ManyRelation

schema/relationship.go:271–444

(relation *Relationship, field *Field, many2many string)

}

func (schema *Schema) buildMany2ManyRelation(relation *Relationship, field *Field, many2many string) {
	relation.Type = Many2Many

	var (
		err             error
		joinTableFields []reflect.StructField
		fieldsMap       = map[string]*Field{}
		ownFieldsMap    = map[string]*Field{} // fix self join many2many
		referFieldsMap  = map[string]*Field{}
		joinForeignKeys = toColumns(field.TagSettings["JOINFOREIGNKEY"])
		joinReferences  = toColumns(field.TagSettings["JOINREFERENCES"])
	)

	ownForeignFields := schema.PrimaryFields
	refForeignFields := relation.FieldSchema.PrimaryFields

	if len(relation.foreignKeys) > 0 {
		ownForeignFields = []*Field{}
		for _, foreignKey := range relation.foreignKeys {
			if field := schema.LookUpField(foreignKey); field != nil {
				ownForeignFields = append(ownForeignFields, field)
			} else {
				schema.err = fmt.Errorf("invalid foreign key: %s", foreignKey)
				return
			}
		}
	}

	if len(relation.primaryKeys) > 0 {
		refForeignFields = []*Field{}
		for _, foreignKey := range relation.primaryKeys {
			if field := relation.FieldSchema.LookUpField(foreignKey); field != nil {
				refForeignFields = append(refForeignFields, field)
			} else {
				schema.err = fmt.Errorf("invalid foreign key: %s", foreignKey)
				return
			}
		}
	}

	for idx, ownField := range ownForeignFields {
		joinFieldName := cases.Title(language.Und, cases.NoLower).String(schema.Name) + ownField.Name
		if len(joinForeignKeys) > idx {
			joinFieldName = cases.Title(language.Und, cases.NoLower).String(joinForeignKeys[idx])
		}

		ownFieldsMap[joinFieldName] = ownField
		fieldsMap[joinFieldName] = ownField
		joinTableFields = append(joinTableFields, reflect.StructField{
			Name:    joinFieldName,
			PkgPath: ownField.StructField.PkgPath,
			Type:    ownField.StructField.Type,
			Tag: removeSettingFromTag(appendSettingFromTag(ownField.StructField.Tag, "primaryKey"),
				"column", "autoincrement", "index", "unique", "uniqueindex"),
		})
	}

	for idx, relField := range refForeignFields {