mirror of
https://github.com/rgrgogu/new_starr.git
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102 lines
6.8 KiB
JavaScript
102 lines
6.8 KiB
JavaScript
'use strict';
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/**
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* Junction revamp — Units and Lessons run independently.
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*
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* courses ⇄ course_units ⇄ units ⇄ unit_lessons ⇄ lessons
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*
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* 1. Create course_units + unit_lessons (ordering lives on the junction rows)
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* 2. Backfill from the old direct FKs (units.course_id / lessons.unit_id),
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* preserving each row's order_index
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* 3. Progress tables accept NULL course/unit context (standalone reads)
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* 4. Drop the old FK + order columns from units / lessons
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*/
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module.exports = {
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async up(queryInterface, Sequelize) {
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// ── 1. Junction tables ────────────────────────────────────────────────────
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await queryInterface.createTable('course_units', {
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course_unit_id: { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
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course_id: { type: Sequelize.BIGINT, allowNull: false, references: { model: 'courses', key: 'course_id' }, onDelete: 'CASCADE' },
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unit_id: { type: Sequelize.BIGINT, allowNull: false, references: { model: 'units', key: 'unit_id' }, onDelete: 'CASCADE' },
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order_index: { type: Sequelize.INTEGER, allowNull: false, defaultValue: 0 },
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createdBy: { type: Sequelize.BIGINT, allowNull: true },
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updatedBy: { type: Sequelize.BIGINT, allowNull: true },
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createdAt: { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.literal('CURRENT_TIMESTAMP') },
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updatedAt: { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.literal('CURRENT_TIMESTAMP') },
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});
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await queryInterface.addIndex('course_units', { fields: ['course_id', 'unit_id'], unique: true, name: 'uq_course_units_course_unit' });
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await queryInterface.addIndex('course_units', { fields: ['course_id'], name: 'idx_course_units_course_id' });
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await queryInterface.addIndex('course_units', { fields: ['unit_id'], name: 'idx_course_units_unit_id' });
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await queryInterface.addIndex('course_units', { fields: ['order_index'], name: 'idx_course_units_order' });
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await queryInterface.createTable('unit_lessons', {
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unit_lesson_id: { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
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unit_id: { type: Sequelize.BIGINT, allowNull: false, references: { model: 'units', key: 'unit_id' }, onDelete: 'CASCADE' },
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lesson_id: { type: Sequelize.BIGINT, allowNull: false, references: { model: 'lessons', key: 'lesson_id' }, onDelete: 'CASCADE' },
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order_index: { type: Sequelize.INTEGER, allowNull: false, defaultValue: 0 },
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createdBy: { type: Sequelize.BIGINT, allowNull: true },
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updatedBy: { type: Sequelize.BIGINT, allowNull: true },
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createdAt: { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.literal('CURRENT_TIMESTAMP') },
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updatedAt: { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.literal('CURRENT_TIMESTAMP') },
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});
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await queryInterface.addIndex('unit_lessons', { fields: ['unit_id', 'lesson_id'], unique: true, name: 'uq_unit_lessons_unit_lesson' });
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await queryInterface.addIndex('unit_lessons', { fields: ['unit_id'], name: 'idx_unit_lessons_unit_id' });
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await queryInterface.addIndex('unit_lessons', { fields: ['lesson_id'], name: 'idx_unit_lessons_lesson_id' });
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await queryInterface.addIndex('unit_lessons', { fields: ['order_index'], name: 'idx_unit_lessons_order' });
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// ── 2. Backfill from the old direct FKs ───────────────────────────────────
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await queryInterface.sequelize.query(`
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INSERT INTO course_units (course_id, unit_id, order_index, "createdBy", "createdAt", "updatedAt")
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SELECT u.course_id, u.unit_id, COALESCE(u.order_index, 0), u."createdBy", CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
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FROM units u
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WHERE u.course_id IS NOT NULL
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`);
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await queryInterface.sequelize.query(`
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INSERT INTO unit_lessons (unit_id, lesson_id, order_index, "createdBy", "createdAt", "updatedAt")
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SELECT l.unit_id, l.lesson_id, COALESCE(l.order_index, 0), l."createdBy", CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
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FROM lessons l
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WHERE l.unit_id IS NOT NULL
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`);
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// ── 3. Progress tables — allow standalone (course-less / unit-less) reads ──
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await queryInterface.changeColumn('unit_reading_progress', 'course_id', { type: Sequelize.BIGINT, allowNull: true });
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await queryInterface.changeColumn('lesson_reading_progress', 'course_id', { type: Sequelize.BIGINT, allowNull: true });
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await queryInterface.changeColumn('lesson_reading_progress', 'unit_id', { type: Sequelize.BIGINT, allowNull: true });
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// ── 4. Drop the old FK + order columns ────────────────────────────────────
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await queryInterface.removeColumn('units', 'course_id');
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await queryInterface.removeColumn('units', 'order_index');
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await queryInterface.removeColumn('lessons', 'unit_id');
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await queryInterface.removeColumn('lessons', 'order_index');
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},
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async down(queryInterface, Sequelize) {
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// Recreate the direct FK columns and restore one parent per child
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await queryInterface.addColumn('units', 'course_id', { type: Sequelize.BIGINT, allowNull: true });
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await queryInterface.addColumn('units', 'order_index', { type: Sequelize.INTEGER, allowNull: false, defaultValue: 0 });
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await queryInterface.addColumn('lessons', 'unit_id', { type: Sequelize.BIGINT, allowNull: true });
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await queryInterface.addColumn('lessons', 'order_index', { type: Sequelize.INTEGER, allowNull: false, defaultValue: 0 });
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// Keep the FIRST attachment per child (multi-parent data collapses)
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await queryInterface.sequelize.query(`
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UPDATE units u SET course_id = cu.course_id, order_index = cu.order_index
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FROM (SELECT DISTINCT ON (unit_id) unit_id, course_id, order_index
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FROM course_units ORDER BY unit_id, course_unit_id) cu
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WHERE u.unit_id = cu.unit_id
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`);
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await queryInterface.sequelize.query(`
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UPDATE lessons l SET unit_id = ul.unit_id, order_index = ul.order_index
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FROM (SELECT DISTINCT ON (lesson_id) lesson_id, unit_id, order_index
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FROM unit_lessons ORDER BY lesson_id, unit_lesson_id) ul
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WHERE l.lesson_id = ul.lesson_id
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`);
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await queryInterface.changeColumn('unit_reading_progress', 'course_id', { type: Sequelize.BIGINT, allowNull: false });
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await queryInterface.changeColumn('lesson_reading_progress', 'course_id', { type: Sequelize.BIGINT, allowNull: false });
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await queryInterface.changeColumn('lesson_reading_progress', 'unit_id', { type: Sequelize.BIGINT, allowNull: false });
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await queryInterface.dropTable('unit_lessons');
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await queryInterface.dropTable('course_units');
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},
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};
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