Error: Form responses must redirect to another location - ruby-on-rails-7

Question

I need to render an html code I receive from an API.
In Rails 6 : I was doing this in my controller, and it was working fine. I called the webservice I received the response, and I was redirected to the code generated by the render. Fine !
class GatewayController < ApplicationController
def new
init_gateway_call
end
def create
call_gateway
render_gateway_response
end
private
...
def render_gateway_response
render(html: #gateway_response.message.html_safe)
end
end
new.html.erb :
<%= form_with url: gateway_path, local: true do |f| %>
...
<% end %>
And no : create.html.erb
** Rails 7 **
I call the webservice. I get the answer but my page idle and I get this error.
Error: Form responses must redirect to another location at FormSubmission.requestSucceededWithResponse (application-0f0c10fb8f5683e32fc53a93a8a323c328de61682ca16fb65a6a2b8a3ba5d087.js:1614)
at FetchRequest.receive (application-0f0c10fb8f5683e32fc53a93a8a323c328de61682ca16fb65a6a2b8a3ba5d087.js:1390)
at FetchRequest.perform (application-0f0c10fb8f5683e32fc53a93a8a323c328de61682ca16fb65a6a2b8a3ba5d087.js:1374)
So far, I tried:
# GatewayController
respond_to :create, format: :html, gateway_response: #gateway_response.message.html_safe
<%= gateway_response %>
Without success ... Do you have any idea? Otherwise it is going to be a long weekend ^^

Answer 1

I figured it out you while posting my question. The error message seems like a Turbo error. I had to had data-turbo false to my form.
<%= form_with url: gateway_path, local: true, data: { turbo: false } do |f| %>
...
<% end %>
And keep my controller like it was.
render(html: #gateway_response.message.html_safe)
Happy upgrade anyone

Answer 2

Setting data: {turbo: false} will cause the page to reload entirely. This takes away the entire point of turbo which is to reduce page reloads.
The reason the error occurs is because Turbo expects a 303 redirect response. The solution is to have the server respond with 422 or 500 status code when you are not redirecting.
if save
redirect_to root_path
else
render :new, status: 422
You can read about this here: https://turbo.hotwired.dev/handbook/drive#redirecting-after-a-form-submission
Of course, if you want the page to reload, you can use data-turbo: false

Answer 3

Thanks! I'm also developing on Rails 7 and data: { turbo: false } fixed my issue.

Answer 4

Instead of using turbo: false as suggested on the answer you need to add appropriate status like :see_other for redirects and 422 (unprocessible_entity) in case render.
render :new, status: 422
redirect_to xyz_path, status: :see_other