tags	language	resources
rails, strong params, nested resources, REST, hidden_field	ruby	2

Before doing this lab, you should have completed the following labs:

1. Rails Blog Scaffold
2. Rails Blog Associations Validations
3. Rails Blog Nested Forms

Rails Blog: Comments

We're going to add another feature to our blog app: the ability comment on a post.

Before anything, note that when you generate models, controllers, etc, be sure to include this option, so that it skips tests (which we already have): --no-test-framework

Comments

1. Generate a model for Comment.

2. Associate comment and post and user, making the appropriate migration changes.

3. Let's create some validations on comment; content should always be present.

4. Generate a controller for comment. We only need a create action, because viewing comments will be handled on the posts show page. Be sure to permit appropriate params in a private method.

5. Comments will be a resource nested under posts. Why? Logically, comments only matter when they are associated with a post.

6. Get the model tests to pass.

Check out the documentation on Nested Resources.

Posting a Comment to a Post

7. Edit the show page for a post to include all comments for the post.

8. On the post show page, we want to have a form to submit a comment. Build out a form for that takes an array as a parameter, and has a hidden field to handle the post_id.

9. Get the comment features tests to pass.

Resources

• Nested Resources
• Hidden Fields