diff --git a/callbacks/preload.go b/callbacks/preload.go index 5b5beb06..6c763da4 100644 --- a/callbacks/preload.go +++ b/callbacks/preload.go @@ -19,6 +19,7 @@ func preload(db *gorm.DB, rels []*schema.Relationship, conds []interface{}) { foreignFields []*schema.Field foreignValues [][]interface{} identityMap = map[string][]reflect.Value{} + inlineConds []interface{} ) if len(rels) > 1 { @@ -64,7 +65,8 @@ func preload(db *gorm.DB, rels []*schema.Relationship, conds []interface{}) { } if results, ok := joinIdentityMap[utils.ToStringKey(fieldValues...)]; ok { - identityMap[utils.ToStringKey(joinFieldValues...)] = results + joinKey := utils.ToStringKey(joinFieldValues...) + identityMap[joinKey] = append(identityMap[joinKey], results...) } } @@ -92,12 +94,23 @@ func preload(db *gorm.DB, rels []*schema.Relationship, conds []interface{}) { reflectResults := rel.FieldSchema.MakeSlice().Elem() column, values := schema.ToQueryValues(relForeignKeys, foreignValues) - tx.Where(clause.IN{Column: column, Values: values}).Find(reflectResults.Addr().Interface(), conds...) + + for _, cond := range conds { + if fc, ok := cond.(func(*gorm.DB) *gorm.DB); ok { + tx = fc(tx) + } else { + inlineConds = append(inlineConds, cond) + } + } + + tx.Where(clause.IN{Column: column, Values: values}).Find(reflectResults.Addr().Interface(), inlineConds...) fieldValues := make([]interface{}, len(relForeignFields)) + for i := 0; i < reflectResults.Len(); i++ { + elem := reflectResults.Index(i) for idx, field := range relForeignFields { - fieldValues[idx], _ = field.ValueOf(reflectResults.Index(i)) + fieldValues[idx], _ = field.ValueOf(elem) } for _, data := range identityMap[utils.ToStringKey(fieldValues...)] { @@ -105,15 +118,16 @@ func preload(db *gorm.DB, rels []*schema.Relationship, conds []interface{}) { if reflectFieldValue.Kind() == reflect.Ptr && reflectFieldValue.IsNil() { reflectFieldValue.Set(reflect.New(rel.Field.FieldType.Elem())) } + reflectFieldValue = reflect.Indirect(reflectFieldValue) switch reflectFieldValue.Kind() { case reflect.Struct: rel.Field.Set(data, reflectResults.Index(i).Interface()) case reflect.Slice, reflect.Array: if reflectFieldValue.Type().Elem().Kind() == reflect.Ptr { - rel.Field.Set(data, reflect.Append(reflectFieldValue, reflectResults.Index(i)).Interface()) + rel.Field.Set(data, reflect.Append(reflectFieldValue, elem).Interface()) } else { - rel.Field.Set(data, reflect.Append(reflectFieldValue, reflectResults.Index(i).Elem()).Interface()) + rel.Field.Set(data, reflect.Append(reflectFieldValue, elem.Elem()).Interface()) } } } diff --git a/schema/utils.go b/schema/utils.go index f7808f0e..ca4ef2f4 100644 --- a/schema/utils.go +++ b/schema/utils.go @@ -95,6 +95,7 @@ func GetIdentityFieldValuesMap(reflectValue reflect.Value, fields []*Field) (map var ( results = [][]interface{}{} dataResults = map[string][]reflect.Value{} + loaded = map[interface{}]bool{} notZero, zero bool ) @@ -114,10 +115,21 @@ func GetIdentityFieldValuesMap(reflectValue reflect.Value, fields []*Field) (map dataResults[utils.ToStringKey(results[0]...)] = []reflect.Value{reflectValue} case reflect.Slice, reflect.Array: for i := 0; i < reflectValue.Len(); i++ { + elem := reflectValue.Index(i) + elemKey := elem.Interface() + if elem.Kind() != reflect.Ptr { + elemKey = elem.Addr().Interface() + } + + if _, ok := loaded[elemKey]; ok { + continue + } + loaded[elemKey] = true + fieldValues := make([]interface{}, len(fields)) notZero = false for idx, field := range fields { - fieldValues[idx], zero = field.ValueOf(reflectValue.Index(i)) + fieldValues[idx], zero = field.ValueOf(elem) notZero = notZero || !zero } @@ -125,9 +137,9 @@ func GetIdentityFieldValuesMap(reflectValue reflect.Value, fields []*Field) (map dataKey := utils.ToStringKey(fieldValues...) if _, ok := dataResults[dataKey]; !ok { results = append(results, fieldValues[:]) - dataResults[dataKey] = []reflect.Value{reflectValue.Index(i)} + dataResults[dataKey] = []reflect.Value{elem} } else { - dataResults[dataKey] = append(dataResults[dataKey], reflectValue.Index(i)) + dataResults[dataKey] = append(dataResults[dataKey], elem) } } } diff --git a/tests/preload_suits_test.go b/tests/preload_suits_test.go new file mode 100644 index 00000000..2e7eeb1f --- /dev/null +++ b/tests/preload_suits_test.go @@ -0,0 +1,1510 @@ +package tests_test + +import ( + "database/sql" + "encoding/json" + "reflect" + "testing" + + "github.com/jinzhu/gorm" + . "github.com/jinzhu/gorm/tests" +) + +func toJSONString(v interface{}) []byte { + r, _ := json.Marshal(v) + return r +} + +func TestNestedPreload1(t *testing.T) { + type ( + Level1 struct { + ID uint + Value string + Level2ID uint + } + Level2 struct { + ID uint + Level1 Level1 + Level3ID uint + } + Level3 struct { + ID uint + Name string + Level2 Level2 + } + ) + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}) + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + want := Level3{Level2: Level2{Level1: Level1{Value: "value"}}} + if err := DB.Create(&want).Error; err != nil { + t.Error(err) + } + + var got Level3 + if err := DB.Preload("Level2").Preload("Level2.Level1").Find(&got).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } + + if err := DB.Preload("Level2").Preload("Level2.Level1").First(&got, "name = ?", "not_found").Error; err != gorm.ErrRecordNotFound { + t.Error(err) + } +} + +func TestNestedPreload2(t *testing.T) { + type ( + Level1 struct { + ID uint + Value string + Level2ID uint + } + Level2 struct { + ID uint + Level1s []*Level1 + Level3ID uint + } + Level3 struct { + ID uint + Name string + Level2s []Level2 + } + ) + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}) + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + want := Level3{ + Level2s: []Level2{ + { + Level1s: []*Level1{ + {Value: "value1"}, + {Value: "value2"}, + }, + }, + { + Level1s: []*Level1{ + {Value: "value3"}, + }, + }, + }, + } + if err := DB.Create(&want).Error; err != nil { + t.Error(err) + } + + var got Level3 + if err := DB.Preload("Level2s.Level1s").Find(&got).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } +} + +func TestNestedPreload3(t *testing.T) { + type ( + Level1 struct { + ID uint + Value string + Level2ID uint + } + Level2 struct { + ID uint + Level1 Level1 + Level3ID uint + } + Level3 struct { + Name string + ID uint + Level2s []Level2 + } + ) + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}) + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + want := Level3{ + Level2s: []Level2{ + {Level1: Level1{Value: "value1"}}, + {Level1: Level1{Value: "value2"}}, + }, + } + if err := DB.Create(&want).Error; err != nil { + t.Error(err) + } + + var got Level3 + if err := DB.Preload("Level2s.Level1").Find(&got).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } +} + +func TestNestedPreload4(t *testing.T) { + type ( + Level1 struct { + ID uint + Value string + Level2ID uint + } + Level2 struct { + ID uint + Level1s []Level1 + Level3ID uint + } + Level3 struct { + ID uint + Name string + Level2 Level2 + } + ) + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}) + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + want := Level3{ + Level2: Level2{ + Level1s: []Level1{ + {Value: "value1"}, + {Value: "value2"}, + }, + }, + } + if err := DB.Create(&want).Error; err != nil { + t.Error(err) + } + + var got Level3 + if err := DB.Preload("Level2.Level1s").Find(&got).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } +} + +// Slice: []Level3 +func TestNestedPreload5(t *testing.T) { + type ( + Level1 struct { + ID uint + Value string + Level2ID uint + } + Level2 struct { + ID uint + Level1 Level1 + Level3ID uint + } + Level3 struct { + ID uint + Name string + Level2 Level2 + } + ) + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}) + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + want := make([]Level3, 2) + want[0] = Level3{Level2: Level2{Level1: Level1{Value: "value"}}} + if err := DB.Create(&want[0]).Error; err != nil { + t.Error(err) + } + want[1] = Level3{Level2: Level2{Level1: Level1{Value: "value2"}}} + if err := DB.Create(&want[1]).Error; err != nil { + t.Error(err) + } + + var got []Level3 + if err := DB.Preload("Level2").Preload("Level2.Level1").Find(&got).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } +} + +func TestNestedPreload6(t *testing.T) { + type ( + Level1 struct { + ID uint + Value string + Level2ID uint + } + Level2 struct { + ID uint + Level1s []Level1 + Level3ID uint + } + Level3 struct { + ID uint + Name string + Level2s []Level2 + } + ) + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}) + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + want := make([]Level3, 2) + want[0] = Level3{ + Level2s: []Level2{ + { + Level1s: []Level1{ + {Value: "value1"}, + {Value: "value2"}, + }, + }, + { + Level1s: []Level1{ + {Value: "value3"}, + }, + }, + }, + } + if err := DB.Create(&want[0]).Error; err != nil { + t.Error(err) + } + + want[1] = Level3{ + Level2s: []Level2{ + { + Level1s: []Level1{ + {Value: "value3"}, + {Value: "value4"}, + }, + }, + { + Level1s: []Level1{ + {Value: "value5"}, + }, + }, + }, + } + if err := DB.Create(&want[1]).Error; err != nil { + t.Error(err) + } + + var got []Level3 + if err := DB.Preload("Level2s.Level1s").Find(&got).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } +} + +func TestNestedPreload7(t *testing.T) { + type ( + Level1 struct { + ID uint + Value string + Level2ID uint + } + Level2 struct { + ID uint + Level1 Level1 + Level3ID uint + } + Level3 struct { + ID uint + Name string + Level2s []Level2 + } + ) + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}) + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + want := make([]Level3, 2) + want[0] = Level3{ + Level2s: []Level2{ + {Level1: Level1{Value: "value1"}}, + {Level1: Level1{Value: "value2"}}, + }, + } + if err := DB.Create(&want[0]).Error; err != nil { + t.Error(err) + } + + want[1] = Level3{ + Level2s: []Level2{ + {Level1: Level1{Value: "value3"}}, + {Level1: Level1{Value: "value4"}}, + }, + } + if err := DB.Create(&want[1]).Error; err != nil { + t.Error(err) + } + + var got []Level3 + if err := DB.Preload("Level2s.Level1").Find(&got).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } +} + +func TestNestedPreload8(t *testing.T) { + type ( + Level1 struct { + ID uint + Value string + Level2ID uint + } + Level2 struct { + ID uint + Level1s []Level1 + Level3ID uint + } + Level3 struct { + ID uint + Name string + Level2 Level2 + } + ) + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}) + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + want := make([]Level3, 2) + want[0] = Level3{ + Level2: Level2{ + Level1s: []Level1{ + {Value: "value1"}, + {Value: "value2"}, + }, + }, + } + if err := DB.Create(&want[0]).Error; err != nil { + t.Error(err) + } + want[1] = Level3{ + Level2: Level2{ + Level1s: []Level1{ + {Value: "value3"}, + {Value: "value4"}, + }, + }, + } + if err := DB.Create(&want[1]).Error; err != nil { + t.Error(err) + } + + var got []Level3 + if err := DB.Preload("Level2.Level1s").Find(&got).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } +} + +func TestNestedPreload9(t *testing.T) { + type ( + Level0 struct { + ID uint + Value string + Level1ID uint + } + Level1 struct { + ID uint + Value string + Level2ID uint + Level2_1ID uint + Level0s []Level0 `json:",omitempty"` + } + Level2 struct { + ID uint + Level1s []Level1 + Level3ID uint + } + Level2_1 struct { + ID uint + Level1s []Level1 `json:",omitempty"` + Level3ID uint + } + Level3 struct { + ID uint + Name string + Level2 Level2 + Level2_1 Level2_1 + } + ) + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}, &Level2_1{}, &Level0{}) + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}, &Level2_1{}, &Level0{}); err != nil { + t.Error(err) + } + + want := make([]Level3, 2) + want[0] = Level3{ + Level2: Level2{ + Level1s: []Level1{ + {Value: "value1"}, + {Value: "value2"}, + }, + }, + Level2_1: Level2_1{ + Level1s: []Level1{ + { + Value: "value1-1", + Level0s: []Level0{{Value: "Level0-1"}}, + }, + { + Value: "value2-2", + Level0s: []Level0{{Value: "Level0-2"}}, + }, + }, + }, + } + if err := DB.Create(&want[0]).Error; err != nil { + t.Error(err) + } + want[1] = Level3{ + Level2: Level2{ + Level1s: []Level1{ + {Value: "value3"}, + {Value: "value4"}, + }, + }, + Level2_1: Level2_1{ + Level1s: []Level1{ + { + Value: "value3-3", + Level0s: []Level0{}, + }, + { + Value: "value4-4", + Level0s: []Level0{}, + }, + }, + }, + } + if err := DB.Create(&want[1]).Error; err != nil { + t.Error(err) + } + + var got []Level3 + if err := DB.Preload("Level2").Preload("Level2.Level1s").Preload("Level2_1").Preload("Level2_1.Level1s").Preload("Level2_1.Level1s.Level0s").Find(&got).Error; err != nil { + t.Error(err) + } + + if string(toJSONString(got)) != string(toJSONString(want)) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } +} + +type LevelA1 struct { + ID uint + Value string +} + +type LevelA2 struct { + ID uint + Value string + LevelA3s []*LevelA3 `json:",omitempty"` +} + +type LevelA3 struct { + ID uint + Value string + LevelA1ID sql.NullInt64 + LevelA1 *LevelA1 + LevelA2ID sql.NullInt64 + LevelA2 *LevelA2 +} + +func TestNestedPreload10(t *testing.T) { + DB.Migrator().DropTable(&LevelA3{}, &LevelA2{}, &LevelA1{}) + if err := DB.AutoMigrate(&LevelA1{}, &LevelA2{}, &LevelA3{}); err != nil { + t.Error(err) + } + + levelA1 := &LevelA1{Value: "foo"} + if err := DB.Save(levelA1).Error; err != nil { + t.Error(err) + } + + want := []*LevelA2{ + { + Value: "bar", + LevelA3s: []*LevelA3{ + { + Value: "qux", + LevelA1: levelA1, + }, + }, + }, + { + Value: "bar 2", + LevelA3s: []*LevelA3{}, + }, + } + for _, levelA2 := range want { + if err := DB.Save(levelA2).Error; err != nil { + t.Error(err) + } + } + + var got []*LevelA2 + if err := DB.Preload("LevelA3s.LevelA1").Find(&got).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(toJSONString(got), toJSONString(want)) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } +} + +type LevelB1 struct { + ID uint + Value string + LevelB3s []*LevelB3 +} + +type LevelB2 struct { + ID uint + Value string +} + +type LevelB3 struct { + ID uint + Value string + LevelB1ID sql.NullInt64 + LevelB1 *LevelB1 + LevelB2s []*LevelB2 `gorm:"many2many:levelb1_levelb3_levelb2s" json:",omitempty"` +} + +func TestNestedPreload11(t *testing.T) { + DB.Migrator().DropTable(&LevelB3{}, &LevelB2{}, &LevelB1{}) + if err := DB.AutoMigrate(&LevelB1{}, &LevelB2{}, &LevelB3{}); err != nil { + t.Error(err) + } + + levelB1 := &LevelB1{Value: "foo"} + if err := DB.Create(levelB1).Error; err != nil { + t.Error(err) + } + + levelB3 := &LevelB3{ + Value: "bar", + LevelB1ID: sql.NullInt64{Valid: true, Int64: int64(levelB1.ID)}, + LevelB2s: []*LevelB2{}, + } + if err := DB.Create(levelB3).Error; err != nil { + t.Error(err) + } + levelB1.LevelB3s = []*LevelB3{levelB3} + + want := []*LevelB1{levelB1} + var got []*LevelB1 + if err := DB.Preload("LevelB3s.LevelB2s").Find(&got).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(toJSONString(got), toJSONString(want)) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } +} + +type LevelC1 struct { + ID uint + Value string + LevelC2ID uint +} + +type LevelC2 struct { + ID uint + Value string + LevelC1 LevelC1 +} + +type LevelC3 struct { + ID uint + Value string + LevelC2ID uint + LevelC2 LevelC2 +} + +func TestNestedPreload12(t *testing.T) { + DB.Migrator().DropTable(&LevelC3{}, &LevelC2{}, &LevelC1{}) + if err := DB.AutoMigrate(&LevelC1{}, &LevelC2{}, &LevelC3{}); err != nil { + t.Error(err) + } + + level2 := LevelC2{ + Value: "c2", + LevelC1: LevelC1{ + Value: "c1", + }, + } + DB.Create(&level2) + + want := []LevelC3{ + { + Value: "c3-1", + LevelC2: level2, + }, { + Value: "c3-2", + LevelC2: level2, + }, + } + + for i := range want { + if err := DB.Create(&want[i]).Error; err != nil { + t.Error(err) + } + } + + var got []LevelC3 + if err := DB.Preload("LevelC2").Preload("LevelC2.LevelC1").Find(&got).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } +} + +func TestManyToManyPreloadWithMultiPrimaryKeys(t *testing.T) { + if name := DB.Dialector.Name(); name == "sqlite" || name == "mssql" { + t.Skip("skip sqlite, mssql due to it doesn't support multiple primary keys with auto increment") + } + + type ( + Level1 struct { + ID uint `gorm:"primary_key;"` + LanguageCode string `gorm:"primary_key"` + Value string + } + Level2 struct { + ID uint `gorm:"primary_key;"` + LanguageCode string `gorm:"primary_key"` + Value string + Level1s []Level1 `gorm:"many2many:levels;"` + } + ) + + DB.Migrator().DropTable(&Level2{}, &Level1{}) + DB.Migrator().DropTable("levels") + + if err := DB.AutoMigrate(&Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + want := Level2{Value: "Bob", LanguageCode: "ru", Level1s: []Level1{ + {Value: "ru", LanguageCode: "ru"}, + {Value: "en", LanguageCode: "en"}, + }} + if err := DB.Save(&want).Error; err != nil { + t.Error(err) + } + + want2 := Level2{Value: "Tom", LanguageCode: "zh", Level1s: []Level1{ + {Value: "zh", LanguageCode: "zh"}, + {Value: "de", LanguageCode: "de"}, + }} + if err := DB.Save(&want2).Error; err != nil { + t.Error(err) + } + + var got Level2 + if err := DB.Preload("Level1s").Find(&got, "value = ?", "Bob").Error; err != nil { + t.Error(err) + } + return + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } + + var got2 Level2 + if err := DB.Preload("Level1s").Find(&got2, "value = ?", "Tom").Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got2, want2) { + t.Errorf("got %s; want %s", toJSONString(got2), toJSONString(want2)) + } + + var got3 []Level2 + if err := DB.Preload("Level1s").Find(&got3, "value IN (?)", []string{"Bob", "Tom"}).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got3, []Level2{got, got2}) { + t.Errorf("got %s; want %s", toJSONString(got3), toJSONString([]Level2{got, got2})) + } + + var got4 []Level2 + if err := DB.Preload("Level1s", "value IN (?)", []string{"zh", "ru"}).Find(&got4, "value IN (?)", []string{"Bob", "Tom"}).Error; err != nil { + t.Error(err) + } + + var ruLevel1 Level1 + var zhLevel1 Level1 + DB.First(&ruLevel1, "value = ?", "ru") + DB.First(&zhLevel1, "value = ?", "zh") + + got.Level1s = []Level1{ruLevel1} + got2.Level1s = []Level1{zhLevel1} + if !reflect.DeepEqual(got4, []Level2{got, got2}) { + t.Errorf("got %s; want %s", toJSONString(got4), toJSONString([]Level2{got, got2})) + } + + if err := DB.Preload("Level1s").Find(&got4, "value IN (?)", []string{"non-existing"}).Error; err != nil { + t.Error(err) + } +} + +func TestManyToManyPreloadForNestedPointer(t *testing.T) { + type ( + Level1 struct { + ID uint + Value string + } + Level2 struct { + ID uint + Value string + Level1s []*Level1 `gorm:"many2many:levels;"` + } + Level3 struct { + ID uint + Value string + Level2ID sql.NullInt64 + Level2 *Level2 + } + ) + + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}) + DB.Migrator().DropTable("levels") + + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + want := Level3{ + Value: "Bob", + Level2: &Level2{ + Value: "Foo", + Level1s: []*Level1{ + {Value: "ru"}, + {Value: "en"}, + }, + }, + } + if err := DB.Save(&want).Error; err != nil { + t.Error(err) + } + + want2 := Level3{ + Value: "Tom", + Level2: &Level2{ + Value: "Bar", + Level1s: []*Level1{ + {Value: "zh"}, + {Value: "de"}, + }, + }, + } + if err := DB.Save(&want2).Error; err != nil { + t.Error(err) + } + + var got Level3 + if err := DB.Preload("Level2.Level1s").Find(&got, "value = ?", "Bob").Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } + + var got2 Level3 + if err := DB.Preload("Level2.Level1s").Find(&got2, "value = ?", "Tom").Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got2, want2) { + t.Errorf("got %s; want %s", toJSONString(got2), toJSONString(want2)) + } + + var got3 []Level3 + if err := DB.Preload("Level2.Level1s").Find(&got3, "value IN (?)", []string{"Bob", "Tom"}).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got3, []Level3{got, got2}) { + t.Errorf("got %s; want %s", toJSONString(got3), toJSONString([]Level3{got, got2})) + } + + var got4 []Level3 + if err := DB.Preload("Level2.Level1s", "value IN (?)", []string{"zh", "ru"}).Find(&got4, "value IN (?)", []string{"Bob", "Tom"}).Error; err != nil { + t.Error(err) + } + + var got5 Level3 + DB.Preload("Level2.Level1s").Find(&got5, "value = ?", "bogus") + + var ruLevel1 Level1 + var zhLevel1 Level1 + DB.First(&ruLevel1, "value = ?", "ru") + DB.First(&zhLevel1, "value = ?", "zh") + + got.Level2.Level1s = []*Level1{&ruLevel1} + got2.Level2.Level1s = []*Level1{&zhLevel1} + if !reflect.DeepEqual(got4, []Level3{got, got2}) { + t.Errorf("got %s; want %s", toJSONString(got4), toJSONString([]Level3{got, got2})) + } +} + +func TestNestedManyToManyPreload(t *testing.T) { + type ( + Level1 struct { + ID uint + Value string + } + Level2 struct { + ID uint + Value string + Level1s []*Level1 `gorm:"many2many:level1_level2;"` + } + Level3 struct { + ID uint + Value string + Level2s []Level2 `gorm:"many2many:level2_level3;"` + } + ) + + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}, "level1_level2", "level2_level3") + + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + want := Level3{ + Value: "Level3", + Level2s: []Level2{ + { + Value: "Bob", + Level1s: []*Level1{ + {Value: "ru"}, + {Value: "en"}, + }, + }, { + Value: "Tom", + Level1s: []*Level1{ + {Value: "zh"}, + {Value: "de"}, + }, + }, + }, + } + + if err := DB.Save(&want).Error; err != nil { + t.Error(err) + } + + var got Level3 + if err := DB.Preload("Level2s").Preload("Level2s.Level1s").Find(&got, "value = ?", "Level3").Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } + + if err := DB.Preload("Level2s.Level1s").First(&got, "value = ?", "not_found").Error; err != gorm.ErrRecordNotFound { + t.Error(err) + } +} + +func TestNestedManyToManyPreload2(t *testing.T) { + type ( + Level1 struct { + ID uint + Value string + } + Level2 struct { + ID uint + Value string + Level1s []*Level1 `gorm:"many2many:level1_level2;"` + } + Level3 struct { + ID uint + Value string + Level2ID sql.NullInt64 + Level2 *Level2 + } + ) + + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}) + DB.Migrator().DropTable("level1_level2") + + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + want := Level3{ + Value: "Level3", + Level2: &Level2{ + Value: "Bob", + Level1s: []*Level1{ + {Value: "ru"}, + {Value: "en"}, + }, + }, + } + + if err := DB.Save(&want).Error; err != nil { + t.Error(err) + } + + var got Level3 + if err := DB.Preload("Level2.Level1s").Find(&got, "value = ?", "Level3").Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } + + if err := DB.Preload("Level2.Level1s").First(&got, "value = ?", "not_found").Error; err != gorm.ErrRecordNotFound { + t.Error(err) + } +} + +func TestNestedManyToManyPreload3(t *testing.T) { + type ( + Level1 struct { + ID uint + Value string + } + Level2 struct { + ID uint + Value string + Level1s []*Level1 `gorm:"many2many:level1_level2;"` + } + Level3 struct { + ID uint + Value string + Level2ID sql.NullInt64 + Level2 *Level2 + } + ) + + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}, "level1_level2") + + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + level1Zh := &Level1{Value: "zh"} + level1Ru := &Level1{Value: "ru"} + level1En := &Level1{Value: "en"} + + level21 := &Level2{ + Value: "Level2-1", + Level1s: []*Level1{level1Zh, level1Ru}, + } + + level22 := &Level2{ + Value: "Level2-2", + Level1s: []*Level1{level1Zh, level1En}, + } + + wants := []*Level3{ + { + Value: "Level3-1", + Level2: level21, + }, + { + Value: "Level3-2", + Level2: level22, + }, + { + Value: "Level3-3", + Level2: level21, + }, + } + + for _, want := range wants { + if err := DB.Save(want).Error; err != nil { + t.Error(err) + } + } + + var gots []*Level3 + if err := DB.Preload("Level2.Level1s", func(db *gorm.DB) *gorm.DB { + return db.Order("level1.id ASC") + }).Find(&gots).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(gots, wants) { + t.Errorf("got %s; want %s", toJSONString(gots), toJSONString(wants)) + } +} + +func TestNestedManyToManyPreload3ForStruct(t *testing.T) { + type ( + Level1 struct { + ID uint + Value string + } + Level2 struct { + ID uint + Value string + Level1s []Level1 `gorm:"many2many:level1_level2;"` + } + Level3 struct { + ID uint + Value string + Level2ID sql.NullInt64 + Level2 Level2 + } + ) + + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}) + DB.Migrator().DropTable("level1_level2") + + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + level1Zh := Level1{Value: "zh"} + level1Ru := Level1{Value: "ru"} + level1En := Level1{Value: "en"} + + level21 := Level2{ + Value: "Level2-1", + Level1s: []Level1{level1Zh, level1Ru}, + } + + level22 := Level2{ + Value: "Level2-2", + Level1s: []Level1{level1Zh, level1En}, + } + + wants := []*Level3{ + { + Value: "Level3-1", + Level2: level21, + }, + { + Value: "Level3-2", + Level2: level22, + }, + { + Value: "Level3-3", + Level2: level21, + }, + } + + for _, want := range wants { + if err := DB.Save(want).Error; err != nil { + t.Error(err) + } + } + + var gots []*Level3 + if err := DB.Preload("Level2.Level1s", func(db *gorm.DB) *gorm.DB { + return db.Order("level1.id ASC") + }).Find(&gots).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(gots, wants) { + t.Errorf("got %s; want %s", toJSONString(gots), toJSONString(wants)) + } +} + +func TestNestedManyToManyPreload4(t *testing.T) { + type ( + Level4 struct { + ID uint + Value string + Level3ID uint + } + Level3 struct { + ID uint + Value string + Level4s []*Level4 + } + Level2 struct { + ID uint + Value string + Level3s []*Level3 `gorm:"many2many:level2_level3;"` + } + Level1 struct { + ID uint + Value string + Level2s []*Level2 `gorm:"many2many:level1_level2;"` + } + ) + + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}, &Level4{}) + DB.Migrator().DropTable("level1_level2") + DB.Migrator().DropTable("level2_level3") + + dummy := Level1{ + Value: "Level1", + Level2s: []*Level2{{ + Value: "Level2", + Level3s: []*Level3{{ + Value: "Level3", + Level4s: []*Level4{{ + Value: "Level4", + }}, + }}, + }}, + } + + if err := DB.AutoMigrate(&Level4{}, &Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + if err := DB.Save(&dummy).Error; err != nil { + t.Error(err) + } + + var level1 Level1 + if err := DB.Preload("Level2s").Preload("Level2s.Level3s").Preload("Level2s.Level3s.Level4s").First(&level1).Error; err != nil { + t.Error(err) + } +} + +func TestManyToManyPreloadForPointer(t *testing.T) { + type ( + Level1 struct { + ID uint + Value string + } + Level2 struct { + ID uint + Value string + Level1s []*Level1 `gorm:"many2many:levels;"` + } + ) + + DB.Migrator().DropTable(&Level2{}, &Level1{}) + DB.Migrator().DropTable("levels") + + if err := DB.AutoMigrate(&Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + want := Level2{Value: "Bob", Level1s: []*Level1{ + {Value: "ru"}, + {Value: "en"}, + }} + if err := DB.Save(&want).Error; err != nil { + t.Error(err) + } + + want2 := Level2{Value: "Tom", Level1s: []*Level1{ + {Value: "zh"}, + {Value: "de"}, + }} + if err := DB.Save(&want2).Error; err != nil { + t.Error(err) + } + + var got Level2 + if err := DB.Preload("Level1s").Find(&got, "value = ?", "Bob").Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } + + var got2 Level2 + if err := DB.Preload("Level1s").Find(&got2, "value = ?", "Tom").Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got2, want2) { + t.Errorf("got %s; want %s", toJSONString(got2), toJSONString(want2)) + } + + var got3 []Level2 + if err := DB.Preload("Level1s").Find(&got3, "value IN (?)", []string{"Bob", "Tom"}).Error; err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got3, []Level2{got, got2}) { + t.Errorf("got %s; want %s", toJSONString(got3), toJSONString([]Level2{got, got2})) + } + + var got4 []Level2 + if err := DB.Preload("Level1s", "value IN (?)", []string{"zh", "ru"}).Find(&got4, "value IN (?)", []string{"Bob", "Tom"}).Error; err != nil { + t.Error(err) + } + + var got5 Level2 + DB.Preload("Level1s").First(&got5, "value = ?", "bogus") + + var ruLevel1 Level1 + var zhLevel1 Level1 + DB.First(&ruLevel1, "value = ?", "ru") + DB.First(&zhLevel1, "value = ?", "zh") + + got.Level1s = []*Level1{&ruLevel1} + got2.Level1s = []*Level1{&zhLevel1} + if !reflect.DeepEqual(got4, []Level2{got, got2}) { + t.Errorf("got %s; want %s", toJSONString(got4), toJSONString([]Level2{got, got2})) + } +} + +func TestNilPointerSlice(t *testing.T) { + type ( + Level3 struct { + ID uint + Value string + } + Level2 struct { + ID uint + Value string + Level3ID uint + Level3 *Level3 + } + Level1 struct { + ID uint + Value string + Level2ID uint + Level2 *Level2 + } + ) + + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}) + + if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil { + t.Error(err) + } + + want := Level1{ + Value: "Bob", + Level2: &Level2{ + Value: "en", + Level3: &Level3{ + Value: "native", + }, + }, + } + if err := DB.Save(&want).Error; err != nil { + t.Error(err) + } + + want2 := Level1{ + Value: "Tom", + Level2: nil, + } + if err := DB.Save(&want2).Error; err != nil { + t.Error(err) + } + + var got []Level1 + if err := DB.Preload("Level2").Preload("Level2.Level3").Find(&got).Error; err != nil { + t.Error(err) + } + + if len(got) != 2 { + t.Errorf("got %v items, expected 2", len(got)) + } + + if !reflect.DeepEqual(got[0], want) && !reflect.DeepEqual(got[1], want) { + t.Errorf("got %s; want array containing %s", toJSONString(got), toJSONString(want)) + } + + if !reflect.DeepEqual(got[0], want2) && !reflect.DeepEqual(got[1], want2) { + t.Errorf("got %s; want array containing %s", toJSONString(got), toJSONString(want2)) + } +} + +func TestNilPointerSlice2(t *testing.T) { + type ( + Level4 struct { + ID uint + } + Level3 struct { + ID uint + Level4ID sql.NullInt64 `sql:"index"` + Level4 *Level4 + } + Level2 struct { + ID uint + Level3s []*Level3 `gorm:"many2many:level2_level3s"` + } + Level1 struct { + ID uint + Level2ID sql.NullInt64 `sql:"index"` + Level2 *Level2 + } + ) + + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}, &Level4{}) + + if err := DB.AutoMigrate(new(Level4), new(Level3), new(Level2), new(Level1)); err != nil { + t.Error(err) + } + + want := new(Level1) + if err := DB.Save(want).Error; err != nil { + t.Error(err) + } + + got := new(Level1) + err := DB.Preload("Level2.Level3s.Level4").Last(&got).Error + if err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } +} + +func TestPrefixedPreloadDuplication(t *testing.T) { + type ( + Level4 struct { + ID uint + Name string + Level3ID uint + } + Level3 struct { + ID uint + Name string + Level4s []*Level4 `json:",omitempty"` + } + Level2 struct { + ID uint + Name string + Level3ID sql.NullInt64 `sql:"index"` + Level3 *Level3 + } + Level1 struct { + ID uint + Name string + Level2ID sql.NullInt64 `sql:"index"` + Level2 *Level2 + } + ) + + DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{}, &Level4{}) + + if err := DB.AutoMigrate(new(Level3), new(Level4), new(Level2), new(Level1)); err != nil { + t.Error(err) + } + + lvl := &Level3{} + if err := DB.Save(lvl).Error; err != nil { + t.Error(err) + } + + sublvl1 := &Level4{Level3ID: lvl.ID} + if err := DB.Save(sublvl1).Error; err != nil { + t.Error(err) + } + sublvl2 := &Level4{Level3ID: lvl.ID} + if err := DB.Save(sublvl2).Error; err != nil { + t.Error(err) + } + + lvl.Level4s = []*Level4{sublvl1, sublvl2} + + want1 := Level1{ + Level2: &Level2{ + Level3: lvl, + }, + } + if err := DB.Save(&want1).Error; err != nil { + t.Error(err) + } + + want2 := Level1{ + Level2: &Level2{ + Level3: lvl, + }, + } + if err := DB.Save(&want2).Error; err != nil { + t.Error(err) + } + + want := []Level1{want1, want2} + + var got []Level1 + err := DB.Preload("Level2.Level3.Level4s").Find(&got).Error + if err != nil { + t.Error(err) + } + + if !reflect.DeepEqual(got, want) { + t.Errorf("got %s; want %s", toJSONString(got), toJSONString(want)) + } +} + +func TestPreloadManyToManyCallbacks(t *testing.T) { + type ( + Level2 struct { + ID uint + Name string + } + Level1 struct { + ID uint + Name string + Level2s []Level2 `gorm:"many2many:level1_level2s"` + } + ) + + DB.Migrator().DropTable(&Level2{}, &Level1{}) + DB.Migrator().DropTable("level1_level2s") + + if err := DB.AutoMigrate(new(Level1), new(Level2)); err != nil { + t.Error(err) + } + + lvl := Level1{ + Name: "l1", + Level2s: []Level2{ + {Name: "l2-1"}, {Name: "l2-2"}, + }, + } + DB.Save(&lvl) + + called := 0 + + DB.Callback().Query().After("gorm:query").Register("TestPreloadManyToManyCallbacks", func(_ *gorm.DB) { + called = called + 1 + }) + + DB.Preload("Level2s").First(&Level1{}, "id = ?", lvl.ID) + + if called != 3 { + t.Errorf("Wanted callback to be called 3 times but got %d", called) + } +}