50 lines
1.7 KiB
MySQL
50 lines
1.7 KiB
MySQL
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-- Migration: Add position field to tasks table for subtasks ordering
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-- Date: 2026-02-02
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--
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-- This migration adds position field to tasks table to allow
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-- custom ordering of subtasks. The field is NULL for regular tasks
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-- and contains position number for subtasks (tasks with parent_task_id).
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-- Добавляем поле position
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ALTER TABLE tasks
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ADD COLUMN position INTEGER;
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-- Заполняем позиции для всех существующих подзадач
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-- Позиции присваиваются по порядку id в рамках каждой родительской задачи
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DO $$
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DECLARE
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parent_record RECORD;
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subtask_record RECORD;
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pos INTEGER;
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BEGIN
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-- Для каждой родительской задачи
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FOR parent_record IN
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SELECT DISTINCT parent_task_id
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FROM tasks
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WHERE parent_task_id IS NOT NULL
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ORDER BY parent_task_id
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LOOP
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pos := 0;
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-- Обновляем подзадачи этой родительской задачи
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FOR subtask_record IN
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SELECT id
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FROM tasks
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WHERE parent_task_id = parent_record.parent_task_id
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AND deleted = FALSE
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ORDER BY id
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LOOP
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UPDATE tasks
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SET position = pos
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WHERE id = subtask_record.id;
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pos := pos + 1;
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END LOOP;
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END LOOP;
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END $$;
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-- Создаем индекс для быстрой сортировки подзадач
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CREATE INDEX idx_tasks_parent_position ON tasks(parent_task_id, position)
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WHERE parent_task_id IS NOT NULL AND deleted = FALSE;
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COMMENT ON COLUMN tasks.position IS 'Position of subtask within parent task. NULL for regular tasks.';
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