Join Kevin Skoglund for an in-depth discussion in this video Many-to-many associations: Simple, part of Ruby on Rails 4 Essential Training.
…Now that we've learned how to create One-to-Many…Associations, ready to move on to learning Many-to-Many Associations.…We'll start by looking at a simple join and then…move on to a more complex join in the next movie.…Many-to-Many Associations are similar to…One-to-Many Associations, because they also…have an object that has many objects which belong to it.…The difference is that in many-to-many the objects don't belong to it exclusively.…For example, a project has and belongs to many collaborators.…The project can have many collaborators, but…the collaborators can also have many projects.…
It's not like a project owns a collaborator exclusively.…They're allowed to work on other projects.…You could have a blog post that has_and_belongs_to_many categories.…If our blog post is in both the technology and training categories,…it doesn't mean that no other blog post can be in those categories.…Technology can have many blog posts, training can have many blog…posts, and several blog posts can make use of those categories.…
- Why use Ruby on Rails?
- Installing Ruby on Rails on Mac and Windows
- Rendering templates and redirecting requests
- Generating and running database migrations
- Creating, updating, and deleting records
- Understanding association types
- Using layouts, partials, and view helpers
- Incorporating assets using asset pipeline
- Validating form data
- Authenticating users and managing user access
- Architecting RESTful applications
- Debugging and error handing
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
13. Data Validation
14. User Authentication
15. Improving the Simple CMS
16. REST and RESTful Routes
17. Debugging and Error Handling
18. Introducing More Advanced Topics
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