}

	if constraint.OnUpdate != "" {
		sql += " ON UPDATE " + constraint.OnUpdate
	}

	foreignKeys := make([]interface{}, 0, len(constraint.ForeignKeys))
	for _, field := range constraint.ForeignKeys {
		foreignKeys = append(foreignKeys, clause.Column{Name: field.DBName})
	}

	references := make([]interface{}, 0, len(constraint.References))
	for _, field := range constraint.References {

				for _, rf := range r.References {
					if (rf.PrimaryKey == nil || (rf.PrimaryKey.Name == ref.PrimaryKey && rf.PrimaryKey.Schema.Name == ref.PrimarySchema)) && (rf.PrimaryValue == ref.PrimaryValue) && (rf.ForeignKey.Name == ref.ForeignKey && rf.ForeignKey.Schema.Name == ref.ForeignSchema) && (rf.OwnPrimaryKey == ref.OwnPrimaryKey) {
						found = true
					}
				}

				if !found {
					var refs []string

					Schema:      "User",
					FieldSchema: "Toy",
					Polymorphic: Polymorphic{ID: "OwnerID", Type: "OwnerType", Value: "users"},
					References: []Reference{
						{ForeignKey: "OwnerType", ForeignSchema: "Toy", PrimaryValue: "users"},
						{ForeignKey: "OwnerType", ForeignSchema: "Toy", PrimaryValue: "users"},
					},
				},
				"Toys": {
					Name:        "Toys",
					Type:        schema.HasMany,

	for _, ref := range relation.References {
		f := joinSchema.LookUpField(ref.ForeignKey.DBName)
		if f == nil {
			return fmt.Errorf("missing field %s for join table", ref.ForeignKey.DBName)
		}

		f.DataType = ref.ForeignKey.DataType
		f.GORMDataType = ref.ForeignKey.GORMDataType
		if f.Size == 0 {
			f.Size = ref.ForeignKey.Size
		}
		ref.ForeignKey = f
	}

					return tx
				}

				refColumns := []clause.Column{}
				for _, rel := range relation.References {
					if rel.OwnPrimaryKey {
						refColumns = append(refColumns, clause.Column{Name: rel.ForeignKey.DBName})
					}
				}

				if len(refColumns) != 0 {
					selectExpr := clause.CommaExpression{}
					for _, column := range q.db.Statement.Selects {