Week 11 Rails Comprehensive - Code-the-Dream-School/rails-guidebook GitHub Wiki

Week	Topic	Learning Objectives	Key Resources
11	Rails Comprehensive	Practice all Rails skills learned to this point Understand the dynamic population of dropdown lists in ERB files Understand foreign keys and foreign key exceptions Learn how to create factories for objects that have associations through foreign keys	Lesson Materials - See Coding Assignment Coding Assignment

Overview: In this lesson, students will apply their Ruby on Rails skills to extend a customer-order application by creating and managing a new Order model. The lesson focuses on building a complete CRUD interface for Order, including validations, associations, and tests.

• Model Creation: Define a new Order model with attributes and associations.
• Routing and Controller: Set up routes and implement CRUD actions in the OrdersController.
• Views: Create and manage views for the Order model.
• Validations and Error Handling: Add validations to the Order model and handle errors.
• Testing: Write model and request tests to ensure proper functionality.
• Foreign Key Constraints: Manage foreign key constraints and handle associated exceptions.

1. Create a New Model:

   • Generate an Order model with attributes: product_name, product_count, and customer_id.
   • Establish a belongs_to association with the Customer model.

2. Set Up Routes:

   • Create routes for CRUD operations for Order, without nesting under Customer.

3. Develop the Controller:

   • Implement index, show, new, edit, create, update, and destroy methods in OrdersController.

4. Create Views:

   • Develop views for Order: edit, index, new, and show.
   • Implement a shared partial form for new and edit views.
   • Update the show view for Customer to list associated Orders.

5. Add Validations:

   • Ensure presence of product_name, product_count, and customer in the Order model.

6. Write Tests:

   • Create model tests for Order to validate the correctness of validations.
   • Write request tests for OrdersController to verify CRUD operations.

7. Improve the Customer Index View:

   • Update the Customer index view to display a table with customer details and order counts.

8. Handle Foreign Key Exceptions:

   • Implement error handling for foreign key constraints in the Customer destroy action.

9. Submit Work:

   • Commit and push changes to the lesson10 branch.
   • Create a pull request and include a link to the pull request with the homework submission.

• Generate Order model with attributes: product_name, product_count, customer_id.
• Establish belongs_to :customer association in the Order model.
• Set up CRUD routes for Order resource.
• Create OrdersController with methods: index, show, new, edit, create, update, destroy.
• Develop views for Order: edit, index, new, and show.
• Implement a shared partial form for new and edit views.
• Update Customer show view to list associated Orders.
• Add validations to Order model for presence of product_name, product_count, and customer.
• Write model tests for Order validations.
• Write request tests for OrdersController CRUD actions.
• Enhance Customer index view with a table displaying customer details and order counts.
• Handle foreign key exceptions in Customer destroy action.
• Commit and push changes to lesson10 branch.
• Create a pull request and include a link with the homework submission.