Join Kevin Skoglund for an in-depth discussion in this video Many-to-many associations: Rich, part of Ruby on Rails 3 Essential Training.
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Now that we've seen how to create simple many-to-many associations using Has and…Belongs to Many, we are going to add some more complexity to our joins.…I call these rich joins.…First, to see why we need more complexity, let's look at our many-to-many…example diagram from the beginning of this chapter.…This is a classic many-to-many example, where we have a number of courses and we…have a number of students who were taking these courses.…This fits the simple many-to- many pattern that we saw before.…have a table called courses and a table called students and the join table…would just be course_students.…Then we'd have two foreign keys,…one for the course, and one for the student, and that would allow us to keep track of it.…
But here is where it falls short.…Imagine for a moment that we want to keep track of more information than just…the fact that a student is participating in the class.…We might want to keep track of what seat number they're sitting at, we might…want to keep track of what date they signed up, or the date they last attended,…
- Understanding MVC (Model View Controller ) architecture
- Routing browser requests through the framework
- Responding to requests with dynamic content
- Defining associations and database relationships
- Creating, reading, updating and deleting records
- Working with forms
- Validating form data
- Reviewing built-in security features
- Authenticating users and managing user access
- Debugging and error handling
Skill Level Beginner
1. What Is Ruby on Rails?
2. Installing Ruby on Rails on a Mac
3. Installing Ruby on Rails on a Windows Machine
4. Getting Started
5. Controllers, Views, and Dynamic Content
6. Databases and Migrations
7. Models, ActiveRecord, and ActiveRelation
9. Controllers and CRUD
10. Layouts, Partials, and View Helpers
12. Data Validation
13. User Authentication
14. Improving the Simple CMS
15. Debugging and Error Handling
16. Introducing More Advanced Topics
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