Join Kevin Skoglund for an in-depth discussion in this video One-to-one associations, part of Ruby on Rails 3 Essential Training.
In this movie we'll look closer at one-to-one associations and see how to…implement them in Rails.…To start, let's consider when you might actually use a one-to-one association,…when you're actually coding in the real world.…There are typically two main uses.…The most common reason you would use it 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 to no one else and that student can…only have one of them.…Now if our use case changes and our relationship changes and suddenly an…employee can have several offices, well then of course we would need a…different relationship.…
But if the definition and the way we want to use it is that each employee can…have only one office, then we can use a one-to-one association.…The second reason is that sometimes they're used to break up a single table.…So for example, customer has_one :billing_address.…All the columns that make up the customer billing address could go in…
- 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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