I have a typical Rails model form with a file attachment selector allowing multiple attachments. It works fine in development, but during a system test, raises an ActiveSupport::MessageVerifier::InvalidSignature exception.
The model has_many_attached :photos.
The form is using form_with and multipart: true.
The HTML source looks correct.
In development, manually using the form with 0 or any file attachments works as expected.
In my system test, I am using the rack_test driver.
test "creating a quote request" do
visit new_quote_request_path
fill_in "First name", with: 'FAKE FIRST'
# ...
click_on "Submit"
assert_text "Success"
end
In the controller, my canonical param-permitting method looks like:
def quote_request_params
params.require(:quote_request).permit(:first_name, :last_name, :email,
:phone_number, :shipping, :promo_code, :description, :item_type_id, :brand_id,
photos: [])
end
My controller create method is typical...
def create
@quote_request = QuoteRequest.new(quote_request_params)
respond_to do |format|
# ...
In the system test, the call of QuoteRequest.new(quote_request_params) raises an ActiveSupport::MessageVerifier::InvalidSignature exception.
With a breakpoint in place, I can see that the quote_request_params looks like:
#<ActionController::Parameters {"first_name"=>"FAKE FIRST",
"last_name"=>"FAKE LAST", "email"=>"fake@fake.com",
"phone_number"=>"5415555555", "shipping"=>"1", "promo_code"=>"",
"description"=>"Fake quote request description.",
"item_type_id"=>"980190962", "brand_id"=>"980190962",
"photos"=>[
"",
"#<Capybara::RackTest::Form::NilUploadedFile:0x000000010dae35b8>"
]} permitted: true>
And it seems Capybara is doing its default behavior of attaching a 'nil file' for the multipart form.
Why is the test raising an ActiveSupport::MessageVerifier::InvalidSignature exception?
This is an issue with Rails 7 and rack-test. It can temporarily be solved by putting the following in config/environments/test.rb:
config.active_storage.multiple_file_field_include_hidden = false
Refer to the rack-test issue for more details.