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Ruby

Clair Griffiths
Clair Griffiths
10,158 Points
Posted by Clair Griffiths
Clair Griffiths
10,158 Points

Testing file attachment with Capybara

Hi all

I'm struggling to get a test to pass in Capybara. When I'm uploading a post I have a validation that makes sure that I've attached a file but I can't seem to replicate this behaviour in a test.

My form looks like this:

<%= form_for @post do |form| %>

    <%= form.label :title %>
    <%= form.text_field :title %>

    <%= form.label :category %>
    <%= form.text_field :category %>

    <%= form.label :image %>
    <%= form.file_field :image %>

    <%= form.submit %>
<% end %>

My test looks like this:

describe "Create posts"
    it "Saves a post on success" do
      visit '/'
      click_link "Add new post"

    fill_in "Title", with: "My new post"    
    fill_in "Category", with: "Questions"
    page.attach_file("image", Rails.root + 'app/assets/images/imagename.jpg') 

    click_button "Create Post"
    expect(page).to have_content("My new post")
   end
end

and the error message I'm getting is:

1) Login Saves a post on success
     Failure/Error: page.attach_file("image", Rails.root + 'app/assets/images/imagename.jpg')
     Capybara::ElementNotFound:
       Unable to find file field "image"

I don't really understand why it is saying it can't find a file field called 'image' when that is exactly what I've called it in the form!

Any help would be gratefully recieved. Thanks in advance.

2 Answers

Seth Reece
Seth Reece
32,867 Points
Seth Reece
Seth Reece
32,867 Points

You probably need to specify a class (or id) name of image in your form. If nested under a post, rails probably gave it an id of post_image, and a name of post[image] or something to that effect.

Clair Griffiths
Clair Griffiths
10,158 Points
Clair Griffiths
Clair Griffiths
10,158 Points

Thanks Seth!

I'm pretty sure it's working (although my test is failing for other reasons now so I can't be fully sure)

In the end, I inspected the element and found that, exactly as you'd said, the field had been given an id of "post_image" and a name of "post[image]".

I substituted this in the code as per below and it now seems to work

page.attach_file("post_image", Rails.root + 'app/assets/images/imagename.jpg')

Thanks again!