Add position property for lists

pkg/migration/20210727204942.go

@@ -0,0 +1,67 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-2021 Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public Licensee as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public Licensee for more details.
+//
+// You should have received a copy of the GNU Affero General Public Licensee
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package migration
+
+import (
+	"math"
+	"src.techknowlogick.com/xormigrate"
+	"xorm.io/xorm"
+)
+
+type lists20210727204942 struct {
+	ID       int64   `xorm:"bigint autoincr not null unique pk" json:"id" param:"list"`
+	Position float64 `xorm:"double null" json:"position"`
+}
+
+func (lists20210727204942) TableName() string {
+	return "lists"
+}
+
+func init() {
+	migrations = append(migrations, &xormigrate.Migration{
+		ID:          "20210727204942",
+		Description: "Add list position parameter",
+		Migrate: func(tx *xorm.Engine) error {
+			err := tx.Sync2(lists20210727204942{})
+			if err != nil {
+				return err
+			}
+
+			lists := []*lists20210727204942{}
+			err = tx.Find(&lists)
+			if err != nil {
+				return err
+			}
+
+			for _, list := range lists {
+				list.Position = float64(list.ID) * math.Pow(2, 16)
+
+				_, err = tx.
+					Where("id = ?", list.ID).
+					Update(list)
+				if err != nil {
+					return err
+				}
+			}
+
+			return nil
+		},
+		Rollback: func(tx *xorm.Engine) error {
+			return nil
+		},
+	})
+}

pkg/models/list.go

@@ -71,6 +71,9 @@ type List struct {
 	// Will only returned when retreiving one list.
 	Subscription *Subscription `xorm:"-" json:"subscription,omitempty"`
 
+	// The position this list has when querying all lists. See the tasks.position property on how to use this.
+	Position float64 `xorm:"double null" json:"position"`
+
 	// A timestamp when this list was created. You cannot change this value.
 	Created time.Time `xorm:"created not null" json:"created"`
 	// A timestamp when this list was last updated. You cannot change this value.