Rendering a partial from a controller in rails

Question

I have a form that is adding rows to the DB via remote => true. I then want to append the new data to a table, but cannot get the correct view to render.

As of now, it is rendering the entire show.html.erb page for the new entry, but I want to layout a minimal version to be added as a . Is there a quick way to tell my controller what view to render after inserting into the db? I want to render my partial named _newly_added.html.erb

My Controller

  def new
    @task = Task.new
    render :partial => "/tasks/newly_added", :locals => { :t => @task }
  end

Thanks!!

EDIT I think what I need is just an alternative "show" view.

I found that the method I needed to change was actually this:

  def create
    @task = Task.new(params[:task])

    respond_to do |format|
      if @task.save
        format.html { redirect_to @task, notice: 'Task was successfully created.' }
        format.json { render json: @task, status: :created, location: @task }
      else
        format.html { render action: "new" }
        format.json { render json: @task.errors, status: :unprocessable_entity }
      end
    end
  end

I just need to make an alternative show view, and then tell this to redirect_to that view.

You can have a partial of just a row `tr` and render the new object in it. Then you can just get the response data of your Ajax call and put the html generated in your table. For this use a respond_to :js without layouts and using a specific partial — MrYoshiji, Nov 13 '12 at 19:33

Tim Sullivan · Accepted Answer · 2012-11-13T21:08:27.640

Edited per the changes in your question. However, nothing really changes. You're thinking about things wrong, and need to adjust how you're thinking. You don't need an alternative show, you need to handle the format.js request.

The partial should be rendered within a JavaScript response, not the controller. The controller looks more like this:

  def create
    @task = Task.new(params[:task])

    respond_to do |format|
      if @task.save
        format.html { redirect_to @task, notice: 'Task was successfully created.' }
        format.json { render json: @task, status: :created, location: @task }
        format.js
      else
        format.html { render action: "new" }
        format.json { render json: @task.errors, status: :unprocessable_entity }
        format.js
      end
    end
  end

Then, in views/tasks/create.js.coffee

($ '#mytable').append("<%= j render(partial: 'tasks/newly_added', locals: { t: @task }) %>")

What's going on here is that the browser makes a call to create.js. The controller responds with the create.js template, because of the respond_to block's format.js. The j escapes the contents of the _newly_added.html.erb file, and the contents of it are appended to the table. The controller doesn't interact with the existing view, instead, JavaScript is sent to the browser, and it interacts with the view.

This all changes somewhat if you're using a client-side MVC framework like Backbone or Ember, but you didn't specify that so I'm assuming you're going with stock Rails.

I made some edits to my original question, I think Ive found what needs to happen now, but I can't figure out the syntax. — nathan, Nov 13 '12 at 20:12
As with new, so with create. Nothing really changes, but I've adjusted my answer to your edited question. — Tim Sullivan, Nov 13 '12 at 21:08
I had tried that earlier to no prevail, but reworked it after seeing your post and it did the trick. thanks! — nathan, Nov 13 '12 at 21:21
No problem! You may want to take a look at Ryan Bates' excellent railscasts on this: http://railscasts.com/episodes/136-jquery-ajax-revised ... the Pro membership is the best $9 I spend every month. — Tim Sullivan, Nov 13 '12 at 21:24
I would add you have to use something like this: http://stackoverflow.com/a/5731237/458177 to not get a complete layout rendered!! — davidhq, Oct 25 '14 at 23:19

Rendering a partial from a controller in rails

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