fix backend for task sort fields.

database/postgres/project.go

@@ -162,6 +162,7 @@ type projectDBO struct {
 	StatusTag      *string        `json:"statusTag" db:"status_tag"`
 	Favorite       bool           `json:"favorite" db:"favorite"`
 	Tags           pq.StringArray `json:"tags" db:"tags"`
+	TaskSortFields pq.StringArray `json:"taskSortFields" db:"task_sort_fields"`
 }
 
 func toProjectDBO(project models.Project) *projectDBO {
@@ -180,6 +181,7 @@ func toProjectDBO(project models.Project) *projectDBO {
 		StatusTag:      project.StatusTag,
 		Favorite:       project.Favorite,
 		Tags:           project.Tags,
+		TaskSortFields: project.TaskSortFields,
 	}
 }
 
@@ -199,5 +201,6 @@ func (d *projectDBO) ToProject() *models.Project {
 		StatusTag:      d.StatusTag,
 		Favorite:       d.Favorite,
 		Tags:           d.Tags,
+		TaskSortFields: d.TaskSortFields,
 	}
 }