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33 lines
1.7 KiB
JavaScript
33 lines
1.7 KiB
JavaScript
/***********************************************************************************************************************************************************************
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* File Name: unit_lessons.mdl.js
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* Type of Program: Model (junction)
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* Description: Attaches a standalone Lesson to a Unit. A Lesson can live in many
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* Units; per-unit ordering lives here (order_index), not on the
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* Lesson itself. Detaching removes the row — the Lesson survives.
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*
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* Author: Kenneth Obsequio (@lash0000)
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* Date Created: Jul. 7, 2026
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***********************************************************************************************************************************************************************/
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const { DataTypes } = require("sequelize");
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const sequelize = require("../../config/db.config");
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const UnitLesson = sequelize.define("UnitLesson", {
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unit_lesson_id: { type: DataTypes.BIGINT, primaryKey: true, autoIncrement: true },
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unit_id: { type: DataTypes.BIGINT, allowNull: false },
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lesson_id: { type: DataTypes.BIGINT, allowNull: false },
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order_index: { type: DataTypes.INTEGER, allowNull: false, defaultValue: 0 },
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createdBy: { type: DataTypes.BIGINT, allowNull: true },
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updatedBy: { type: DataTypes.BIGINT, allowNull: true },
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}, {
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tableName: "unit_lessons",
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timestamps: true,
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indexes: [
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{ unique: true, fields: ["unit_id", "lesson_id"], name: "uq_unit_lessons_unit_lesson" },
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{ fields: ["unit_id"], name: "idx_unit_lessons_unit_id" },
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{ fields: ["lesson_id"], name: "idx_unit_lessons_lesson_id" },
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{ fields: ["order_index"], name: "idx_unit_lessons_order" },
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],
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});
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module.exports = UnitLesson;
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