Add Slice Association for BelongsTo

association.go

@@ -366,6 +366,11 @@ func (association *Association) saveAssociation(clear bool, values ...interface{
 			if clear && len(values) == 0 {
 				for i := 0; i < reflectValue.Len(); i++ {
 					association.Relationship.Field.Set(reflectValue.Index(i), reflect.New(association.Relationship.Field.IndirectFieldType).Interface())
+					for _, ref := range association.Relationship.References {
+						if !ref.OwnPrimaryKey {
+							ref.ForeignKey.Set(reflectValue.Index(i), reflect.Zero(ref.ForeignKey.FieldType).Interface())
+						}
+					}
 				}
 				break
 			}
@@ -382,6 +387,11 @@ func (association *Association) saveAssociation(clear bool, values ...interface{
 	case reflect.Struct:
 		if clear && len(values) == 0 {
 			association.Relationship.Field.Set(reflectValue, reflect.New(association.Relationship.Field.IndirectFieldType).Interface())
+			for _, ref := range association.Relationship.References {
+				if !ref.OwnPrimaryKey {
+					ref.ForeignKey.Set(reflectValue, reflect.Zero(ref.ForeignKey.FieldType).Interface())
+				}
+			}
 		}
 
 		for idx, value := range values {
@@ -392,10 +402,12 @@ func (association *Association) saveAssociation(clear bool, values ...interface{
 		_, hasZero = association.DB.Statement.Schema.PrioritizedPrimaryField.ValueOf(reflectValue)
 	}
 
+	if len(values) > 0 {
 		if hasZero {
-		association.DB.Save(reflectValue.Addr().Interface())
+			association.DB.Create(reflectValue.Addr().Interface())
 		} else {
-		association.DB.Select(selectedColumns).Save(reflectValue.Addr().Interface())
+			association.DB.Select(selectedColumns).Model(nil).Save(reflectValue.Addr().Interface())
+		}
 	}
 
 	for _, assignBack := range assignBacks {

callbacks/update.go

@@ -173,12 +173,30 @@ func ConvertToAssignments(stmt *gorm.Statement) (set clause.Set) {
 	}
 
 	if stmt.Dest != stmt.Model {
-		reflectValue := reflect.ValueOf(stmt.Model)
+		reflectValue := reflect.Indirect(reflect.ValueOf(stmt.Model))
+		switch reflectValue.Kind() {
+		case reflect.Slice, reflect.Array:
+			var priamryKeyExprs []clause.Expression
+			for i := 0; i < reflectValue.Len(); i++ {
+				var exprs = make([]clause.Expression, len(stmt.Schema.PrimaryFields))
+				var notZero bool
+				for idx, field := range stmt.Schema.PrimaryFields {
+					value, isZero := field.ValueOf(reflectValue.Index(i))
+					exprs[idx] = clause.Eq{Column: field.DBName, Value: value}
+					notZero = notZero || !isZero
+				}
+				if notZero {
+					priamryKeyExprs = append(priamryKeyExprs, clause.And(exprs...))
+				}
+			}
+			stmt.AddClause(clause.Where{Exprs: []clause.Expression{clause.Or(priamryKeyExprs...)}})
+		case reflect.Struct:
 			for _, field := range stmt.Schema.PrimaryFields {
 				if value, isZero := field.ValueOf(reflectValue); !isZero {
 					stmt.AddClause(clause.Where{Exprs: []clause.Expression{clause.Eq{Column: field.DBName, Value: value}}})
 				}
 			}
 		}
+	}
 	return
 }

errors.go

@@ -19,4 +19,6 @@ var (
 	ErrMissingWhereClause = errors.New("missing WHERE clause while deleting")
 	// ErrUnsupportedRelation unsupported relations
 	ErrUnsupportedRelation = errors.New("unsupported relations")
+	// ErrPtrStructSupported only ptr of struct supported
+	ErrPtrStructSupported = errors.New("only ptr of struct supported")
 )

finisher_api.go

@@ -23,7 +23,11 @@ func (db *DB) Save(value interface{}) (tx *DB) {
 
 	if err := tx.Statement.Parse(value); err == nil && tx.Statement.Schema != nil {
 		where := clause.Where{Exprs: make([]clause.Expression, len(tx.Statement.Schema.PrimaryFields))}
-		reflectValue := reflect.ValueOf(value)
+		reflectValue := reflect.Indirect(reflect.ValueOf(value))
+		switch reflectValue.Kind() {
+		case reflect.Slice, reflect.Array:
+			tx.AddError(ErrPtrStructSupported)
+		case reflect.Struct:
 			for idx, pf := range tx.Statement.Schema.PrimaryFields {
 				if pv, isZero := pf.ValueOf(reflectValue); isZero {
 					tx.callbacks.Create().Execute(tx)
@@ -31,6 +35,7 @@ func (db *DB) Save(value interface{}) (tx *DB) {
 					return
 				}
 			}
+		}
 
 		tx.Statement.AddClause(where)
 	}

tests/associations_test.go

@@ -6,7 +6,26 @@ import (
 	. "github.com/jinzhu/gorm/tests"
 )
 
-func TestAssociationForBelongsTo(t *testing.T) {
+func AssertAssociationCount(t *testing.T, data interface{}, name string, result int64, reason string) {
+	if count := DB.Model(data).Association(name).Count(); count != result {
+		t.Errorf("invalid %v count %v, expects: %v got %v", name, reason, result, count)
+	}
+
+	var newUser User
+	if user, ok := data.(User); ok {
+		DB.Find(&newUser, "id = ?", user.ID)
+	} else if user, ok := data.(*User); ok {
+		DB.Find(&newUser, "id = ?", user.ID)
+	}
+
+	if newUser.ID != 0 {
+		if count := DB.Model(&newUser).Association(name).Count(); count != result {
+			t.Errorf("invalid %v count %v, expects: %v got %v", name, reason, result, count)
+		}
+	}
+}
+
+func TestBelongsToAssociation(t *testing.T) {
 	var user = *GetUser("belongs-to", Config{Company: true, Manager: true})
 
 	if err := DB.Create(&user).Error; err != nil {
@@ -24,13 +43,8 @@ func TestAssociationForBelongsTo(t *testing.T) {
 	CheckUser(t, user2, user)
 
 	// Count
-	if count := DB.Model(&user).Association("Company").Count(); count != 1 {
+	AssertAssociationCount(t, user, "Company", 1, "")
-		t.Errorf("invalid company count, got %v", count)
+	AssertAssociationCount(t, user, "Manager", 1, "")
-	}
-
-	if count := DB.Model(&user).Association("Manager").Count(); count != 1 {
-		t.Errorf("invalid manager count, got %v", count)
-	}
 
 	// Append
 	var company = Company{Name: "company-belongs-to-append"}
@@ -58,6 +72,9 @@ func TestAssociationForBelongsTo(t *testing.T) {
 	user.ManagerID = &manager.ID
 	CheckUser(t, user2, user)
 
+	AssertAssociationCount(t, user2, "Company", 1, "AfterAppend")
+	AssertAssociationCount(t, user2, "Manager", 1, "AfterAppend")
+
 	// Replace
 	var company2 = Company{Name: "company-belongs-to-replace"}
 	var manager2 = GetUser("manager-belongs-to-replace", Config{})
@@ -84,40 +101,31 @@ func TestAssociationForBelongsTo(t *testing.T) {
 	user.ManagerID = &manager2.ID
 	CheckUser(t, user2, user)
 
+	AssertAssociationCount(t, user2, "Company", 1, "AfterReplace")
+	AssertAssociationCount(t, user2, "Manager", 1, "AfterReplace")
+
 	// Delete
 	if err := DB.Model(&user2).Association("Company").Delete(&Company{}); err != nil {
 		t.Fatalf("Error happened when delete Company, got %v", err)
 	}
-
+	AssertAssociationCount(t, user2, "Company", 1, "after delete non-existing data")
-	if count := DB.Model(&user2).Association("Company").Count(); count != 1 {
-		t.Errorf("Invalid company count after delete non-existing association, got %v", count)
-	}
 
 	if err := DB.Model(&user2).Association("Company").Delete(&company2); err != nil {
 		t.Fatalf("Error happened when delete Company, got %v", err)
 	}
-
+	AssertAssociationCount(t, user2, "Company", 0, "after delete")
-	if count := DB.Model(&user2).Association("Company").Count(); count != 0 {
-		t.Errorf("Invalid company count after delete, got %v", count)
-	}
 
 	if err := DB.Model(&user2).Association("Manager").Delete(&User{}); err != nil {
 		t.Fatalf("Error happened when delete Manager, got %v", err)
 	}
-
+	AssertAssociationCount(t, user2, "Manager", 1, "after delete non-existing data")
-	if count := DB.Model(&user2).Association("Manager").Count(); count != 1 {
-		t.Errorf("Invalid manager count after delete non-existing association, got %v", count)
-	}
 
 	if err := DB.Model(&user2).Association("Manager").Delete(manager2); err != nil {
 		t.Fatalf("Error happened when delete Manager, got %v", err)
 	}
+	AssertAssociationCount(t, user2, "Manager", 0, "after delete")
 
-	if count := DB.Model(&user2).Association("Manager").Count(); count != 0 {
+	// Prepare Data for Clear
-		t.Errorf("Invalid manager count after delete, got %v", count)
-	}
-
-	// Prepare Data
 	if err := DB.Model(&user2).Association("Company").Append(&company); err != nil {
 		t.Fatalf("Error happened when append Company, got %v", err)
 	}
@@ -126,13 +134,8 @@ func TestAssociationForBelongsTo(t *testing.T) {
 		t.Fatalf("Error happened when append Manager, got %v", err)
 	}
 
-	if count := DB.Model(&user2).Association("Company").Count(); count != 1 {
+	AssertAssociationCount(t, user2, "Company", 1, "after prepare data")
-		t.Errorf("Invalid company count after append, got %v", count)
+	AssertAssociationCount(t, user2, "Manager", 1, "after prepare data")
-	}
-
-	if count := DB.Model(&user2).Association("Manager").Count(); count != 1 {
-		t.Errorf("Invalid manager count after append, got %v", count)
-	}
 
 	// Clear
 	if err := DB.Model(&user2).Association("Company").Clear(); err != nil {
@@ -143,11 +146,43 @@ func TestAssociationForBelongsTo(t *testing.T) {
 		t.Errorf("Error happened when clear Manager, got %v", err)
 	}
 
-	if count := DB.Model(&user2).Association("Company").Count(); count != 0 {
+	AssertAssociationCount(t, user2, "Company", 0, "after clear")
-		t.Errorf("Invalid company count after clear, got %v", count)
+	AssertAssociationCount(t, user2, "Manager", 0, "after clear")
 }
 
-	if count := DB.Model(&user2).Association("Manager").Count(); count != 0 {
+func TestBelongsToAssociationForSlice(t *testing.T) {
-		t.Errorf("Invalid manager count after clear, got %v", count)
+	var users = []User{
+		*GetUser("slice-belongs-to-1", Config{Company: true, Manager: true}),
+		*GetUser("slice-belongs-to-2", Config{Company: true, Manager: false}),
+		*GetUser("slice-belongs-to-3", Config{Company: true, Manager: true}),
 	}
+
+	DB.Create(&users)
+
+	AssertAssociationCount(t, users, "Company", 3, "")
+	AssertAssociationCount(t, users, "Manager", 2, "")
+
+	// Find
+	var companies []Company
+	if DB.Model(users).Association("Company").Find(&companies); len(companies) != 3 {
+		t.Errorf("companies count should be %v, but got %v", 3, len(companies))
+	}
+
+	var managers []User
+	if DB.Model(users).Association("Manager").Find(&managers); len(managers) != 2 {
+		t.Errorf("managers count should be %v, but got %v", 2, len(managers))
+	}
+
+	// Append
+
+	// Replace
+
+	// Delete
+
+	// Clear
+	DB.Model(&users).Association("Company").Clear()
+	AssertAssociationCount(t, users, "Company", 0, "After Clear")
+
+	DB.Model(&users).Association("Manager").Clear()
+	AssertAssociationCount(t, users, "Manager", 0, "After Clear")
 }