Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Ruby Active Record Associations in Rails Using Associations in Your App Creating an Associated Record

Lukasz Walczak
Lukasz Walczak
6,620 Points

@post.comments.create(comment_params) Vs. @post.comments.new(comment_params)

Why do we use @post.comments.create(comment_params) instead of @post.comments.new(comment_params)?

We used new(params) in the creation of post.

1 Answer

Jay McGavren
STAFF
Jay McGavren
Treehouse Teacher

new creates a model object without saving it to the database. create creates the model object and then also immediately saves it.

If you want to create a model object but need to make additional changes to it before saving it, you want new instead of create.