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add: ver()

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Signed-off-by: Kenneth Obsequio <k80308392@gmail.com>
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kennethobsequio
2026-07-08 11:31:40 +08:00
parent 0e4cd86119
commit bb7e8fde08
29 changed files with 2234 additions and 780 deletions
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database/migrations/20260707000001-junction-revamp-course-units-lessons.js
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'use strict';
/**
* Junction revamp — Units and Lessons run independently.
*
* courses ⇄ course_units ⇄ units ⇄ unit_lessons ⇄ lessons
*
* 1. Create course_units + unit_lessons (ordering lives on the junction rows)
* 2. Backfill from the old direct FKs (units.course_id / lessons.unit_id),
* preserving each row's order_index
* 3. Progress tables accept NULL course/unit context (standalone reads)
* 4. Drop the old FK + order columns from units / lessons
*/
module.exports = {
async up(queryInterface, Sequelize) {
// ── 1. Junction tables ────────────────────────────────────────────────────
await queryInterface.createTable('course_units', {
course_unit_id: { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
course_id: { type: Sequelize.BIGINT, allowNull: false, references: { model: 'courses', key: 'course_id' }, onDelete: 'CASCADE' },
unit_id: { type: Sequelize.BIGINT, allowNull: false, references: { model: 'units', key: 'unit_id' }, onDelete: 'CASCADE' },
order_index: { type: Sequelize.INTEGER, allowNull: false, defaultValue: 0 },
createdBy: { type: Sequelize.BIGINT, allowNull: true },
updatedBy: { type: Sequelize.BIGINT, allowNull: true },
createdAt: { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.literal('CURRENT_TIMESTAMP') },
updatedAt: { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.literal('CURRENT_TIMESTAMP') },
});
await queryInterface.addIndex('course_units', { fields: ['course_id', 'unit_id'], unique: true, name: 'uq_course_units_course_unit' });
await queryInterface.addIndex('course_units', { fields: ['course_id'], name: 'idx_course_units_course_id' });
await queryInterface.addIndex('course_units', { fields: ['unit_id'], name: 'idx_course_units_unit_id' });
await queryInterface.addIndex('course_units', { fields: ['order_index'], name: 'idx_course_units_order' });
await queryInterface.createTable('unit_lessons', {
unit_lesson_id: { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
unit_id: { type: Sequelize.BIGINT, allowNull: false, references: { model: 'units', key: 'unit_id' }, onDelete: 'CASCADE' },
lesson_id: { type: Sequelize.BIGINT, allowNull: false, references: { model: 'lessons', key: 'lesson_id' }, onDelete: 'CASCADE' },
order_index: { type: Sequelize.INTEGER, allowNull: false, defaultValue: 0 },
createdBy: { type: Sequelize.BIGINT, allowNull: true },
updatedBy: { type: Sequelize.BIGINT, allowNull: true },
createdAt: { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.literal('CURRENT_TIMESTAMP') },
updatedAt: { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.literal('CURRENT_TIMESTAMP') },
});
await queryInterface.addIndex('unit_lessons', { fields: ['unit_id', 'lesson_id'], unique: true, name: 'uq_unit_lessons_unit_lesson' });
await queryInterface.addIndex('unit_lessons', { fields: ['unit_id'], name: 'idx_unit_lessons_unit_id' });
await queryInterface.addIndex('unit_lessons', { fields: ['lesson_id'], name: 'idx_unit_lessons_lesson_id' });
await queryInterface.addIndex('unit_lessons', { fields: ['order_index'], name: 'idx_unit_lessons_order' });
// ── 2. Backfill from the old direct FKs ───────────────────────────────────
await queryInterface.sequelize.query(`
INSERT INTO course_units (course_id, unit_id, order_index, "createdBy", "createdAt", "updatedAt")
SELECT u.course_id, u.unit_id, COALESCE(u.order_index, 0), u."createdBy", CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
FROM units u
WHERE u.course_id IS NOT NULL
`);
await queryInterface.sequelize.query(`
INSERT INTO unit_lessons (unit_id, lesson_id, order_index, "createdBy", "createdAt", "updatedAt")
SELECT l.unit_id, l.lesson_id, COALESCE(l.order_index, 0), l."createdBy", CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
FROM lessons l
WHERE l.unit_id IS NOT NULL
`);
// ── 3. Progress tables — allow standalone (course-less / unit-less) reads ──
await queryInterface.changeColumn('unit_reading_progress', 'course_id', { type: Sequelize.BIGINT, allowNull: true });
await queryInterface.changeColumn('lesson_reading_progress', 'course_id', { type: Sequelize.BIGINT, allowNull: true });
await queryInterface.changeColumn('lesson_reading_progress', 'unit_id', { type: Sequelize.BIGINT, allowNull: true });
// ── 4. Drop the old FK + order columns ────────────────────────────────────
await queryInterface.removeColumn('units', 'course_id');
await queryInterface.removeColumn('units', 'order_index');
await queryInterface.removeColumn('lessons', 'unit_id');
await queryInterface.removeColumn('lessons', 'order_index');
},
async down(queryInterface, Sequelize) {
// Recreate the direct FK columns and restore one parent per child
await queryInterface.addColumn('units', 'course_id', { type: Sequelize.BIGINT, allowNull: true });
await queryInterface.addColumn('units', 'order_index', { type: Sequelize.INTEGER, allowNull: false, defaultValue: 0 });
await queryInterface.addColumn('lessons', 'unit_id', { type: Sequelize.BIGINT, allowNull: true });
await queryInterface.addColumn('lessons', 'order_index', { type: Sequelize.INTEGER, allowNull: false, defaultValue: 0 });
// Keep the FIRST attachment per child (multi-parent data collapses)
await queryInterface.sequelize.query(`
UPDATE units u SET course_id = cu.course_id, order_index = cu.order_index
FROM (SELECT DISTINCT ON (unit_id) unit_id, course_id, order_index
FROM course_units ORDER BY unit_id, course_unit_id) cu
WHERE u.unit_id = cu.unit_id
`);
await queryInterface.sequelize.query(`
UPDATE lessons l SET unit_id = ul.unit_id, order_index = ul.order_index
FROM (SELECT DISTINCT ON (lesson_id) lesson_id, unit_id, order_index
FROM unit_lessons ORDER BY lesson_id, unit_lesson_id) ul
WHERE l.lesson_id = ul.lesson_id
`);
await queryInterface.changeColumn('unit_reading_progress', 'course_id', { type: Sequelize.BIGINT, allowNull: false });
await queryInterface.changeColumn('lesson_reading_progress', 'course_id', { type: Sequelize.BIGINT, allowNull: false });
await queryInterface.changeColumn('lesson_reading_progress', 'unit_id', { type: Sequelize.BIGINT, allowNull: false });
await queryInterface.dropTable('unit_lessons');
await queryInterface.dropTable('course_units');
},
};