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Editorial Team
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Asked: 2026-06-14T17:16:21+00:00

I’m having a hard time understanding the proper way to pass a param using

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I’m having a hard time understanding the proper way to pass a param using link_to and UJS.

I have the following resources:

  • Photos
  • Comments
  • Users

A user is trying to comment on a photo by clicking “Add Comment.” When this happens a box pops up using UJS showing a form rendered by utilizing a new.js.erb file. After “Create Comment” is posted the create.js.erb file is called to handle the update, which just hides the comment box and adds the comment to a list of comments.

In my index.html.erb for my photos I am doing the following:

I specify a link to add comments passing in the id of the current photo.

<%= link_to 'Add Comment', new_comment_path( photo_id: photo.id ), remote: true %>

This gives me the url: 0.0.0.0:3000/comments/new?photo_id=1, which is what I expect.

Now my question is, how do I handle this passed parameter in my new action such that I can specify something like 

@comment.photo_id = photo_id 
or 
@comment.photo_id = params[:photo_id]

in my comments_controller.rb?

Is there something I can do in JS that will help me save the photo_id value to my @comment.photo_id column for the comment added?

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1 Answer

  1. Editorial Team

    First of all I’ll suggest you to start using nested routes for things like comments or likes. You will find the railscast here nested_routes_railscast

    Coming back to your question, use @comment.photo_id = params[:photo_id] in your controller.

    There is a better approach to accomplish this, You can have the popup already on the photo show page. In the popup you can have a form for new comment model. After clicking on the specific photo you just have get the id of that photo using javascript and copy it into the hidden field for :photo_id in the form.

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