added Course and Category

app/Models/Category.ts

@@ -0,0 +1,22 @@
+import { DateTime } from 'luxon';
+import { BaseModel, column } from '@ioc:Adonis/Lucid/Orm';
+
+export default class Category extends BaseModel {
+  @column({ isPrimary: true })
+  public id: number;
+
+  @column()
+  public title: string;
+
+  @column()
+  public slug: string;
+
+  @column()
+  public description: string;
+
+  @column.dateTime({ autoCreate: true })
+  public createdAt: DateTime;
+
+  @column.dateTime({ autoCreate: true, autoUpdate: true })
+  public updatedAt: DateTime;
+}

app/Models/Course.ts

@@ -0,0 +1,44 @@
+/* eslint-disable no-param-reassign */
+import { nanoid } from 'nanoid';
+import { DateTime } from 'luxon';
+import { BaseModel, beforeCreate, column, HasOne, hasOne } from '@ioc:Adonis/Lucid/Orm';
+import User from './User';
+import Category from './Category';
+
+export default class Course extends BaseModel {
+  @column({ isPrimary: true })
+  public id: string;
+
+  @column()
+  public title: string;
+
+  @column()
+  public description: string;
+
+  @column()
+  public teacher_id: string;
+
+  @column()
+  public category_id: number;
+
+  @hasOne(() => User)
+  public teacher: HasOne<typeof User>;
+
+  @hasOne(() => Category)
+  public category: HasOne<typeof Category>;
+
+  @column.dateTime({ autoCreate: true })
+  public createdAt: DateTime;
+
+  @column.dateTime({ autoCreate: true, autoUpdate: true })
+  public updatedAt: DateTime;
+
+  /**
+   * Assign id to course by nanoid.
+   * @param user User
+   */
+  @beforeCreate()
+  public static assignCourseId(course: Course) {
+    course.id = nanoid();
+  }
+}

database/migrations/1626964029348_roles.ts

@@ -6,8 +6,8 @@ export default class Roles extends BaseSchema {
   public async up() {
     this.schema.createTable(this.tableName, table => {
       table.increments('id');
-      table.string('name');
+      table.string('name').notNullable();
-      table.string('slug');
+      table.string('slug').unique().notNullable();
       table.timestamp('created_at', { useTz: true });
       table.timestamp('updated_at', { useTz: true });
     });

database/migrations/1627295886598_categories.ts

@@ -0,0 +1,20 @@
+import BaseSchema from '@ioc:Adonis/Lucid/Schema';
+
+export default class Categories extends BaseSchema {
+  protected tableName = 'categories';
+
+  public async up() {
+    this.schema.createTable(this.tableName, table => {
+      table.increments('id');
+      table.string('title').notNullable();
+      table.string('slug').unique().notNullable();
+      table.string('description');
+      table.timestamp('created_at', { useTz: true });
+      table.timestamp('updated_at', { useTz: true });
+    });
+  }
+
+  public async down() {
+    this.schema.dropTable(this.tableName);
+  }
+}

database/migrations/1627300211260_courses.ts

@@ -0,0 +1,21 @@
+import BaseSchema from '@ioc:Adonis/Lucid/Schema';
+
+export default class Courses extends BaseSchema {
+  protected tableName = 'courses';
+
+  public async up() {
+    this.schema.createTable(this.tableName, table => {
+      table.string('id', 21).primary();
+      table.string('title').notNullable();
+      table.string('description').notNullable();
+      table.string('teacher_id', 21).unsigned().references('users.id').onDelete('CASCADE');
+      table.integer('category_id').unsigned().references('categories.id').onDelete('CASCADE');
+      table.timestamp('created_at', { useTz: true });
+      table.timestamp('updated_at', { useTz: true });
+    });
+  }
+
+  public async down() {
+    this.schema.dropTable(this.tableName);
+  }
+}

database/seeders/Category.ts

@@ -0,0 +1,29 @@
+import BaseSeeder from '@ioc:Adonis/Lucid/Seeder';
+import Category from 'App/Models/Category';
+
+export default class CategorySeeder extends BaseSeeder {
+  private Category: typeof Category;
+
+  public async run() {
+    this.Category = Category;
+
+    const category1 = new this.Category();
+    category1.title = 'JavaScript';
+    category1.slug = 'javascript';
+    category1.description = 'Category 1 description';
+
+    const category2 = new this.Category();
+    category2.title = 'ReactJS';
+    category2.slug = 'reactjs';
+    category2.description = 'Category 2 description';
+
+    const category3 = new this.Category();
+    category3.title = 'NodeJS';
+    category3.slug = 'nodejs';
+    category3.description = 'Category 3 description';
+
+    await category1.save();
+    await category2.save();
+    await category3.save();
+  }
+}

database/seeders/Course.ts

@@ -0,0 +1,53 @@
+import BaseSeeder from '@ioc:Adonis/Lucid/Seeder';
+import Category from 'App/Models/Category';
+import Course from 'App/Models/Course';
+import User from 'App/Models/User';
+
+export default class CourseSeeder extends BaseSeeder {
+  private Course: typeof Course;
+
+  private User: typeof User;
+
+  private Category: typeof Category;
+
+  public async run() {
+    this.Course = Course;
+    this.User = User;
+    this.Category = Category;
+
+    const teacher = await this.User.findByOrFail('login', 'nikolai123');
+
+    /**
+     * Course 1
+     */
+    const category1 = await this.Category.findByOrFail('slug', 'javascript');
+    const course1 = new this.Course();
+    course1.title = 'Course 1';
+    course1.description = 'Course 1 description';
+    course1.teacher_id = teacher.id;
+    course1.category_id = category1.id;
+    await course1.save();
+
+    /**
+     * Course 2
+     */
+    const category2 = await this.Category.findByOrFail('slug', 'reactjs');
+    const course2 = new this.Course();
+    course2.title = 'Course 2';
+    course2.description = 'Course 2 description';
+    course2.teacher_id = teacher.id;
+    course2.category_id = category2.id;
+    await course2.save();
+
+    /**
+     * Course 3
+     */
+    const category3 = await this.Category.findByOrFail('slug', 'nodejs');
+    const course3 = new this.Course();
+    course3.title = 'Course 3';
+    course3.description = 'Course 3 description';
+    course3.teacher_id = teacher.id;
+    course3.category_id = category3.id;
+    await course3.save();
+  }
+}

database/seeders/MainSeeder/Index.ts

@@ -19,5 +19,7 @@ export default class IndexSeeder extends BaseSeeder {
   public async run() {
     await this.runSeeder(await import('../Role'));
     await this.runSeeder(await import('../User'));
+    await this.runSeeder(await import('../Category'));
+    await this.runSeeder(await import('../Course'));
   }
 }