Join Kevin Skoglund for an in-depth discussion in this video Relationship types, part of Ruby on Rails 4 Essential Training.
…In the previous chapter, we learned how to create, read, update…and delete records using a single model and a single database table.…But what if we wanted to work with the data, in related tables?…That's kind of the point of a relational database after all.…We could go about it by querying for a record.…Reading the value of its foreign key, and then finding the related record…by making a second query with a foreign key in the query conditions.…That would be a valid approach, but it is tedious to write…out all that code every time we want to find a related record.…It would be better if we could define the…relationships between our models and therefore between our tables.…
And then work with those relationships in an object oriented way…and let Rails do all the behind the scenes work for us.…Active Record provides something called associations,…that allows us to define these relationships.…We'll start out by looking at the general types of…database relationships and then learn how Rails handles each one.…
- 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 Intermediate
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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