…We've added code to create records in the controller.…Now we want to be able to update records from the controller.…Like Create, there are two standard Rails actions for updating.…Edit displays the form, while update processes the form.…In fact, this two step process of updating records is…almost exactly like the process we just saw for creating them.…There are only two key differences.…The first, is that we need to make sure that we have an ID.…New and create didn't need an ID, because there was no record in the database yet.…But edit and update will require that there be…an ID so we can find that existing record.…
Edit will use that existing record's values to prepopulate the form.…Edit will need to find the object before it goes about updating it.…The second difference is in the form processing.…Create instantiated a new object and then saved it.…Update will find an existing object and…then use update attributes to update its data.…But otherwise the two processors are almost identical.…Let's add them to our application.…
- 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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