Join Kevin Skoglund for an in-depth discussion in this video One-to-one associations, part of Ruby on Rails 4 Essential Training.
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…In this movie, we'll learn to implement one-to-one associations in Rails.…Let's first consider when you might actually use a one-to-one association.…There are two main uses.…The most common reason, is for unique items that…a person or a thing can have only one of.…For example, an employee has_one :office or a student has_one :id_card.…The ID card is unique, it belongs only to this one student.…And can't belong to anyone else, and that…student is only allowed to have one ID card.…
It's certainly possible to imagine a scenario…where an employee might have two offices, instead…of one but by using a has_one…relationship, we're rejecting that possibility in our design.…We've made it a statement of fact that each employee can have only one.…At the point that we want to allow employees to have more…than one office, then we would have to revise our relationships to match.…The second reason to use a one-to-one…relationship is to break up a single table.…For example, customer has_one :billing_address.…The billing address columns could go in the customer's table.…
- 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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