IMPLEMENT THE COURSE CRUD LOGIC (#8)

* Add Course and UserCourse entities, integrate relationships, update auth middleware for CRUD operations, implement course routes, controller, and service

* updated the config file

* Updated the couseEntity to have Course video record stored

* resoved the dotenv issue

* updated the inport of entities in the connfig file

* updated inport in the jobService

* updated naming convention conflic resolve

* adjusted the server file and config

* resolved the conflict between App.js and Server.js

config/config.js

@@ -1,20 +1,25 @@
-import { DataSource } from 'typeorm';
-import  User  from '../entities/user.entity.js';
-import Job from '../entities/job.entity.js';
+import dotenv from "dotenv"
+import { DataSource } from "typeorm";
+import { Course } from "../entities/course.entity.js"
+import { UserCourse } from "../entities/userCourse.entity.js"
+import  UserEntity  from "../entities/user.entity.js";
+import Job  from "../entities/job.entity.js";
+
+dotenv.config()
 
 const AppDataSource = new DataSource({
-  type: 'postgres',
-  host: process.env.DB_HOST || 'localhost',
-  port: parseInt(process.env.DB_PORT || '5432'),
+  type: "postgres",
+  host: process.env.DB_HOST,
+  port: Number.parseInt(process.env.DB_PORT),
   username: process.env.DB_USER,
   password: process.env.DB_PASSWORD,
   database: process.env.DB_NAME,
   synchronize: true,
-  dropSchema: false,
-  logging: false,
-  entities: [User, Job],
+  logging: true,
+  entities: [UserEntity, Course, UserCourse, Job],
   subscribers: [],
   migrations: [],
-});
+})
+
+export default AppDataSource;
 
-export default AppDataSource;

controllers/course.controller.js

@@ -0,0 +1,126 @@
+import { CourseService } from "../services/courseServices.js"
+import courseValidation from "../validation/course.validation.js"
+
+class CourseController {
+  async createCourse(req, res) {
+    try {
+      const { error, value } = courseValidation.createCourse.validate(req.body)
+      if (error) {
+        return res.status(400).json({ message: error.details[0].message })
+      }
+
+      const course = await CourseService.createCourse(value)
+      res.status(201).json(course)
+    } catch (error) {
+      if (error.message === "Course already exists") {
+        res.status(409).json({ message: error.message })
+      } else {
+        res.status(400).json({ message: "Error creating course", error: error.message })
+      }
+    }
+  }
+
+  async getAllCourses(req, res) {
+    try {
+      const courses = await CourseService.getAllCourses()
+      res.json(courses)
+    } catch (error) {
+      res.status(500).json({ message: "Error fetching courses", error: error.message })
+    }
+  }
+
+  async getCourseById(req, res) {
+    try {
+      const { error, value } = courseValidation.courseIdParam.validate({ id: req.params.id })
+      if (error) {
+        return res.status(400).json({ message: error.details[0].message })
+      }
+
+      const course = await CourseService.getCourseById(value.id)
+      if (course) {
+        res.json(course)
+      } else {
+        res.status(404).json({ message: "Course not found" })
+      }
+    } catch (error) {
+      res.status(500).json({ message: "Error fetching course", error: error.message })
+    }
+  }
+
+  async updateCourse(req, res) {
+    try {
+      const idValidation = courseValidation.courseIdParam.validate({ id: req.params.id })
+      if (idValidation.error) {
+        return res.status(400).json({ message: idValidation.error.details[0].message })
+      }
+
+      const { error, value } = courseValidation.updateCourse.validate(req.body)
+      if (error) {
+        return res.status(400).json({ message: error.details[0].message })
+      }
+
+      const course = await CourseService.updateCourse(idValidation.value.id, value)
+      if (course) {
+        res.json(course)
+      } else {
+        res.status(404).json({ message: "Course not found" })
+      }
+    } catch (error) {
+      if (error.message === "Course already exists") {
+        res.status(409).json({ message: error.message })
+      } else {
+        res.status(400).json({ message: "Error updating course", error: error.message })
+      }
+    }
+  }
+
+  async deleteCourse(req, res) {
+    try {
+      const { error, value } = courseValidation.courseIdParam.validate({ id: req.params.id })
+      if (error) {
+        return res.status(400).json({ message: error.details[0].message })
+      }
+
+      await CourseService.deleteCourse(value.id)
+      res.status(204).send()
+    } catch (error) {
+      if (error.message === "Course not found") {
+        res.status(404).json({ message: error.message })
+      } else {
+        res.status(500).json({ message: "Error deleting course", error: error.message })
+      }
+    }
+  }
+
+  async updateCourseVideo(req, res) {
+    try {
+      const { error: idError, value: idValue } = courseValidation.courseIdParam.validate({ id: req.params.id })
+      if (idError) {
+        return res.status(400).json({ message: idError.details[0].message })
+      }
+
+      if (!req.file) {
+        return res.status(400).json({ message: "No video file uploaded" })
+      }
+
+      const videoUrl = `/uploads/courses/videos/${req.file.filename}`
+
+      const { error, value } = courseValidation.updateCourseVideo.validate({ videoUrl })
+      if (error) {
+        return res.status(400).json({ message: error.details[0].message })
+      }
+
+      const updatedCourse = await CourseService.updateCourseVideo(idValue.id, value.videoUrl)
+      if (updatedCourse) {
+        res.json(updatedCourse)
+      } else {
+        res.status(404).json({ message: "Course not found" })
+      }
+    } catch (error) {
+      res.status(500).json({ message: "Error updating course video", error: error.message })
+    }
+  }
+}
+
+export default new CourseController()
+

entities/course.entity.js

@@ -0,0 +1,65 @@
+import { EntitySchema } from "typeorm"
+
+export const Course = new EntitySchema({
+  name: "Course",
+  tableName: "courses",
+  columns: {
+    id: {
+      type: "int",
+      primary: true,
+      generated: true,
+    },
+    title: {
+      type: "varchar",
+      unique: true,
+      nullable: false,
+    },
+    description: {
+      type: "text",
+      nullable: true,
+    },
+    instructorId: {
+      type: "int",
+      nullable: false,
+    },
+    level: {
+      type: "varchar",
+      nullable: true,
+    },
+    duration: {
+      type: "int",
+      nullable: true,
+    },
+    videoUrl: {
+      type: "varchar",
+      nullable: true,
+    },
+    createdAt: {
+      type: "timestamp",
+      createDate: true,
+    },
+  },
+  relations: {
+    users: {
+      type: "many-to-many",
+      target: "UserEntity",
+      joinTable: {
+        name: "user_courses",
+        joinColumn: {
+          name: "courseId",
+          referencedColumnName: "id",
+        },
+        inverseJoinColumn: {
+          name: "userId",
+          referencedColumnName: "id",
+        },
+      },
+    },
+    userCourses: {
+      type: "one-to-many",
+      target: "UserCourse",
+      inverseSide: "course",
+    },
+  },
+})
+

entities/user.entity.js

@@ -17,7 +17,6 @@ const UserEntity = new EntitySchema({
       type: 'varchar',
       length: 20,
     },
-    // Generalizes to job seeker/employer/institution name
     name: {
       type: 'varchar',
       length: 100,
@@ -26,18 +25,15 @@ const UserEntity = new EntitySchema({
       type: 'varchar',
       unique: true,
     },
-    // Tutor-specific (nullable)
     title: {
       type: 'varchar',
       length: 100,
       nullable: true,
     },
-    // Used as bio (Job Seeker, Tutor, Institution)/description (Company)
     bio: {
       type: 'text',
       nullable: true,
     },
-    // Tutor-specific (nullable)
     skills: {
       type: 'simple-array',
       nullable: true,
@@ -47,11 +43,33 @@ const UserEntity = new EntitySchema({
       createDate: true,
     },
   },
+  relations: {
+    courses: {
+      type: 'many-to-many',
+      target: 'Course',
+      joinTable: {
+        name: 'user_courses',
+        joinColumn: {
+          name: 'userId',
+          referencedColumnName: 'id',
+        },
+        inverseJoinColumn: {
+          name: 'courseId',
+          referencedColumnName: 'id',
+        },
+      },
+    },
+    userCourses: {
+      type: 'one-to-many',
+      target: 'UserCourse',
+      inverseSide: 'user',
+    },
+  },
   indices: [
     { columns: ['walletAddress'] },
     { columns: ['email'] },
     { columns: ['role'] }, // Index role if querying by it frequently
   ],
 });
 
-export default UserEntity;
+export default UserEntity

entities/userCourse.entity.js

@@ -0,0 +1,45 @@
+import { EntitySchema } from "typeorm"
+
+export const UserCourse = new EntitySchema({
+  name: "UserCourse",
+  tableName: "user_courses",
+  columns: {
+    userId: {
+      primary: true,
+      type: "int",
+    },
+    courseId: {
+      primary: true,
+      type: "int",
+    },
+    progress: {
+      type: "int",
+      default: 0,
+    },
+    enrollmentDate: {
+      type: "timestamp",
+      createDate: true,
+    },
+  },
+  relations: {
+    user: {
+      type: "many-to-one",
+      target: "User",
+      joinColumn: {
+        name: "userId",
+        referencedColumnName: "id",
+      },
+      onDelete: "CASCADE",
+    },
+    course: {
+      type: "many-to-one",
+      target: "Course",
+      joinColumn: {
+        name: "courseId",
+        referencedColumnName: "id",
+      },
+      onDelete: "CASCADE",
+    },
+  },
+})
+

http/courseRoute.http

@@ -0,0 +1,46 @@
+@baseUrl = http://localhost:3000/api/courses
+
+### Create a new course
+POST {{baseUrl}}
+Content-Type: application/json
+
+{
+  "title": "Advance Blockchain",
+  "description": "Learn the basics of blockchain technology",
+  "instructorId": 1,
+  "level": "beginner",
+  "duration": 5
+}
+
+### Get all courses
+GET {{baseUrl}}
+
+### Get a specific course
+GET {{baseUrl}}/1
+
+### Update a course
+PUT {{baseUrl}}/1
+Content-Type: application/json
+{
+  "title": "Advanced Blockchain Concepts",
+  "description": "Dive deeper into blockchain technology and its applications"
+}
+
+### Delete a course
+DELETE {{baseUrl}}/4
+
+### Create another course
+POST {{baseUrl}}
+Content-Type: application/json
+
+{
+  "title": "Advance Smart Contract Development",
+  "description": "Learn how to create and deploy smart contracts on blockchain platforms",
+  "instructorId": 2,
+  "level": "beginner",
+  "duration": 5
+}
+
+### Get all courses after operations
+GET {{baseUrl}}
+