Getting an ActionController::UnknownFormat, rspec testing when creating new object

Question

Recently moved to Rails 4 and getting errors that I wasn't getting before. I'm trying to test a form that I'm making using Capybara/Rspec.

When I click the button on the form, the error I get is:

Failure/Error: find(".submit.button").click
     ActionController::UnknownFormat:
       ActionController::UnknownFormat
     # ./app/controllers/office_listings_controller.rb:32:in `create'
     # ./spec/features/office_listings_spec.rb:78:in `block (3 levels) in <top (required)>'

It points to my controller which looks like:

def create
    selected_amenities = params[:amenities] || [] # empty list if no amenities checked
    @office_listing = OfficeListing.new(params[:office_listing])
    @office_listing.broker = current_broker
    p current_broker
    @office_listing.neighborhood = Neighborhood.find(params[:neighborhood_id])
    p @office_listing.neighborhood
    if @office_listing && @office_listing.save!
      @path = city_neighborhood_office_listing_path(@office_listing, :city_id => @office_listing.neighborhood.city.id, :neighborhood_id => @office_listing.neighborhood.id)
      create_amenities(@office_listing, selected_amenities)
      respond_to do |format|
        format.js
      end
    else
      @failure = "Unable to create office :-("
      respond_to do |format|
        format.js
      end
    end
  end

and it doesn't like the format.js line even though I have a create.js.erb file which is being rendered when I actually run the page.

Don't understand why the actual page is running but my test is failing.

Any thoughts would be greatly appreciated!!

Answer 1

I had a similar problem:

post :duplicate, id: patient.media.first.id

produced the same error:

Failure/Error: post :duplicate, id: patient.media.first.id
ActionController::UnknownFormat:
ActionController::UnknownFormat

I fixed it by adding the format to the post call:

post :duplicate, id: patient.media.first.id, format: :js

Answer 2

Before Rails 5:

post :action, id: ..., format: :json

From Rails 5 onward:

post :action, params: { id: ..., format: :json }

Answer 3

yep, using the format: :js solved the problem, in my case my code looks like this:

In my spec:

  params = {
    profile_id: profile.id,
    track_id: track.id,
    format: :js
  }

  post :create, params

In my controller:

  respond_to do |format|
    format.js {}
  end