# Task 2 (3 days)

Set up a new repository named `ruby_school_oop` and create a file named main.rb with the code

puts "Hello World"

### Create the Student class
* Create a new file student.rb
* Attributes - id, name, birth_date, :email, :phone_number
* Create the following instance method
* `save` - save the record to `@@record` class variable
* `destroy` - destroy the record from `@@record`
* `display` - simple string that represents the instance.
* Create the following class method
* `all` - return all the records
* `find` - return the first instance by id
* `find_by_email` - returns the instance by email

### Add a new student
* In main.rb file, import the student class `require_relative 'student'`
* Remove the puts "Hello, World!" line.
* Write a script that prompts the user to input the attributes from the student class to add a new record
* id must be base the size of the records (starts from 1)
* If the student is added successfully, display the new added student
* If the student is added successfully, print a success message like `"Student added successfully!"`

### Delete a student record

* Modify the program to allow the user to choose between two actions like adding or deleting a student.
* If the user choose the delete action, prompt for the student's id to delete it frmo the records
* If the student is destroyed successfully, print a success message like `"Student destroyed successfully!"`

### Repeat Actions Using a Loop

Use a while loop to keep the program running until the user decides to stop (exit keyword).
After each action (add_student or delete_student), allow the user to perform another action or exit the program.

### Create the Course class
* Create a new file `course.rb`
* Attributes - id, name
* Create the following instance method
* `save` - save the record to `@@record` class variable
* `destroy` - destroy the record from `@@record`
* `display` - simple string that represents the instance.
* Create the following class method
* `all` - return all the records
* `find` - return the first instance by id

### Add a new Course
* In main.rb file, import the cousrse class `require_relative 'course'`
* Modify the program to allow the user to choose between two actions like `student management` and `course management`. Under these management actions allow the user choose if they will add or delete a record
* Write a script that prompts the user to input the attributes from the course class to add a new record
* id must be base the size of the records (starts from 1)
* If the course is added successfully, display the new added course
* If the course is added successfully, print a success message like `"Course added successfully!"`

### Delete a course record

* Add a new action under the `course management`
* If the user choose the delete action, prompt for the course's id to delete it from the records.
* If the course is destroyed successfully, print a success message like `"Course destroyed successfully!"`

### Create the Subject class
* Create a new file `subject.rb`
* Attributes - id, name
* Create the following instance method
* `save` - save the record to `@@record` class variable
* `destroy` - destroy the record from `@@record`
* `display` - simple string that represents the instance.
* Create the following class method
* `all` - return all the records
* `find` - return the first instance by id

### Add a new Subject record
* In main.rb file, import the subject class `require_relative 'subject'`
* Modify the program and a new prompt for `subject management`. Under these management allow the user to add a new record
* Write a script that prompts the user to input the attributes from the `subject` class to add a new record
* id must be base the size of the records (starts from 1)
* If the subject is added successfully, display the new added subject record
* If the subject is added successfully, print a success message like `"Subject added successfully!"`

### Delete a Subject record

* Add a new action under the `Subject management`
* If the user choose the delete action, prompt for the subject's id to delete it from the records.
* If the subject is destroyed successfully, print a success message like `"Subject destroyed successfully!"`

### Create the Teacher class
* Create a new file `teacher.rb`
* Attributes - id, name, birth_date, email, phone_number, department
* Create the following instance method
* `save` - save the record to `@@record` class variable
* `destroy` - destroy the record from `@@record`
* `display` - simple string that represents the instance.
* Create the following class method
* `all` - return all the records
* `find` - return the first instance by id
* `find_by_email` - returns the instance by email

### Add a new teacher record
* In main.rb file, import the teacher class `require_relative 'teacher'`
* Modify the program and a new prompt for `teacher management`. Under these management allow the user to add a new record
* Write a script that prompts the user to input the attributes from the teacher class to add a new record
* id must be base the size of the records (starts from 1)
* If the teacher is added successfully, print the new added teacher record
* If the teacher is added successfully, print a success message like `"Teacher added successfully!"`

### Delete a Teacher record

* Add a new action under the `teacher management`
* If the user choose the delete action, prompt for the teacher's id to delete it from the records.
* If the teacher is destroyed successfully, print a success message like `"Teacher destroyed successfully!"`

<hr>

### Add display for records

* Add a new action to each management section (e.g., student, course, subject, teacher) to display its records.

### Add soft delete

* Add a `deleted_at` attribute to the following classes: `Student`, `Course`, `Subject`, and `Teacher`.
* Modify the destroy method to update the `deleted_at` attribute with `Time.now` instead of permanently removing the records.
* Modify the all method to return only records where `deleted_at` is `nil`.
* Ensure that your display does not include any deleted records.

### Add Update Functionality for Each Record

* Modify the `save` method so that it can either update an existing record or save a new one.
* Add a new action for each management section that allows users to edit records.
* Ensure that you only update the existing record instead of replacing it with a new one.
* Make sure the creation of new records still works.
- Hint: You can use the `id` attribute to check if an instance already exists.
* If the record is updated successfully, print a success message like: `#{class} updated successfully!`

### Let user to pick the student course

* Modify the `Student` class to add a new attribute: `course_id`.
* Update the "add student" action to:
* Display the available courses.
* Allow the user to input the `course_id`.
* Update the display action in student management to show the course name for each student by using the `Course` class.

<hr>

### Let each management continuous

* Modify each management and add a new loop
* Prompt the actions for that management
* Add a `back to school management` actions and return to the main prompt.

### Create the CourseSubject class

* Create a new file `course_subject.rb`
* Attributes - id, course_id, subject_id
* Create the following instance method
* `save` - save the record to `@@record` class variable
* `destroy` - destroy the record from `@@record`
* `display` - simple string that represents the instance.
* Create the following class method
* `all` - return all the records
* `find` - return the first instance by id

### Let user bind course to subject

* In the `course management`, modify the `display` action and allow user to input the `course_id` and display additional prompts.
* Display the course details.
* Add `add subjects` action to allow the user add new subjects
* Display the available courses.
* Add `remove subjects` action to allow the user subjects
* Display the course subjects
* Add a new loop to allow the user to keep switching

### Modify course display action

* Modify the `Course` class and add a new instance methods:
* Add the `students` method, this method will return the collection of student object belongs to this course
* Add the `subjects` method, this method will return the collection of subject object belongs to this course
* In the `course management -> display`, allow user to have more actions like:
* Add a new prompt that will allow the user to view all the students belongs to this course
* Add a new prompt that will allow the user to view all the subjects belongs to this course

### Create the StudentSubject class

* Create a new file `student_subject.rb`
* Attributes - id, student_id, subject_id
* Create the following instance method
* `save` - save the record to `@@record` class variable
* `destroy` - destroy the record from `@@record`
* `display` - simple string that represents the instance.
* Create the following class method
* `all` - return all the records
* `find` - return the first instance by id

### Let students to enroll subjects

* When we are creating a new student, we assign them to a course and those course have subjects assign those to the new student using the `StudentSubject` class.

### Show Student Subjects
* Add a `subjects` instance method in the `Student` class and return a collection of subjects.
* In the `student_management`, modify the display action and allow user to input the `student_id` and display additional prompts.
* Display the student details with the enrolled subjects .

### Modify the student and teacher class

* Create a new class and let the `Student` and `Teacher` class to inherit the new class