Validations In Controller Actions Lab

Time to apply these new tools!

The goal of this lab is to allow users of this blog-style application to create and edit authors and posts without worrying about typos or other mistakes leading to error-prone form submissions.

For example, if someone creates a blog post with less than 100 characters of content, it's likely that they accidentally pasted the wrong text, or misunderstood which information goes into which field. We can improve the user's experience and the stability of our codebase by notifying users about these kinds of mistakes before bad data gets into the database.

Objectives

• Define validations on a model
• Use the validation state of a model in a response conditional in an action
• Re-render a form with validation errors
• Validate a create action
• Validate an update action

Requirements

Make sure you run rake db:seed so you have some data to work with (defined in db/seeds.rb).

This is a barebones app with two models, Author and Post. Right now, you can...

• View an author
• View a post
• Create an author
• Edit a post

To complete this lab, you will need to:

1. Add validations to Author such that...
2. The name cannot be blank
3. The e-mail is unique
4. Add validations to Post such that...
5. The title cannot be blank
6. The category is either "Fiction" or "Non-Fiction"
7. The content is at least 100 characters long.
8. Change AuthorsController#create to re-render the form if the new author is invalid.
9. Change PostsController#update to re-render the form if the updated post is invalid.

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