Join Kevin Skoglund for an in-depth discussion in this video Validation methods, part of Ruby on Rails 4 Essential Training.
…Validations, allow us to make sure that the data meets…a set of requirement, before it's saved to the database.…You can think of them as the rules, that our data must follow.…We could validate data every time a form is submitted.…In other words, put the validation code in our controllers.…But, that would make it so that the rules are…only enforced when we go through one of those controller actions.…And we'd end up repeating ourselves, every time we…had a controller, making updates to the same database tables.…It's much better to enforce the rules all the time, globally in our application.…Since this concerns the applications interaction with the…database, the model is the best place for it.…
That way the rules will be enforced right at the doorway to the database.…So, we'll use active record validations to…define these validation rules in our models.…They become part of the intelligence of the model, and can be…automatically checked anytime the model goes to save the data to the database.…If the data doesn't follow the validation's rules, then…
- 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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