Back Button Skipping Page in Ruby on Rails application - ruby-on-rails

Question

I have found many generic posts suggesting this has to do with redirects. I believe this may be due to how I have a form set up.
On the plans.html.erb page I have a form with four submits, each going to the same place with different params:
<%= form_with url: :affiliate_select_plan, class: "mx-auto" do |f| %>
<!-- Paid Plans -->
<% #plans.each_with_index do |plan, i| %>
<%= f.button 'Select Plan', value: plan[:name], type: 'submit' %>
<% end %>
<% end %>
I have the affiliate_select_plan_path setup in my routes.rb:
devise_scope :affiliate do
post 'affiliate/select_plan', :to => 'affiliates/registrations#select_plan'
end
The form successfully hits the select_plan method in the controller, which redirects it to the new_affiliate_registration_path, passing the needed params.
def select_plan
redirect_to new_affiliate_registration_path(plan: plan_params[:button])
end
The new method in the controller is called, directing the user to the sign up page:
# GET /resource/sign_up
def new
#plan = AffiliatePlan.find_by(nickname: params.permit(:plan)[:plan].downcase)
super
end
From this page, if the back button on the browser is selected, it will bring the user back to the page they were at before being at plans.html.erb.
Could this be related to the redirect_to?
EDIT:
Here are the logs:
Started GET "/" for 127.0.0.1 at 2020-02-25 19:06:02 -0500
Processing by Affiliates::RegistrationsController#plans as HTML
Rendering affiliates/registrations/plans.html.erb within layouts/application
Rendered affiliates/registrations/plans.html.erb within layouts/application (5.2ms)
Rendered layouts/_google_analytics.html.erb (0.5ms)
[Webpacker] Everything's up-to-date. Nothing to do
Rendered layouts/_header.html.erb (1.2ms)
Rendered layouts/_footer.html.erb (0.7ms)
Completed 200 OK in 195ms (Views: 194.2ms | ActiveRecord: 0.0ms)
Started POST "/partner/select_plan" for 127.0.0.1 at 2020-02-25 19:06:13 -0500
Processing by Affiliates::RegistrationsController#select_plan as JS
Parameters: {"utf8"=>"✓", "authenticity_token"=>"Ck8HGRryriXleQrUjCSKjTrIRLIw273EdSu4WZnFn3kAL1mMmk7jqR1tZgnPniHsMzHFMl81vPBRuvA0/W4uSw==", "button"=>"Local"}
Unpermitted parameters: :utf8, :authenticity_token
Redirected to http://localhost:3000/partners/sign_up?plan=Local
Completed 200 OK in 1ms (ActiveRecord: 0.0ms)
Started GET "/partners/sign_up?plan=Local" for 127.0.0.1 at 2020-02-25 19:06:13 -0500
Processing by Affiliates::RegistrationsController#new as HTML
Parameters: {"plan"=>"Local"}
AffiliatePlan Load (1.2ms) SELECT "affiliate_plans".* FROM "affiliate_plans" WHERE "affiliate_plans"."nickname" = $1 LIMIT $2 [["nickname", "local"], ["LIMIT", 1]]
↳ app/controllers/affiliates/registrations_controller.rb:11
Rendering affiliates/registrations/new.html.erb within layouts/application
Rendered affiliates/registrations/new.html.erb within layouts/application (4.6ms)
Rendered layouts/_google_analytics.html.erb (1.1ms)
[Webpacker] Everything's up-to-date. Nothing to do
Rendered layouts/_header.html.erb (1.2ms)
Rendered layouts/_footer.html.erb (0.7ms)
Completed 200 OK in 191ms (Views: 187.6ms | ActiveRecord: 1.2ms)

Answer 1

I have a hunch that this might have to do with form resubmission: Forms and the back button tend to be a bit wonky at times.
However, instead of going more in depth with this, let me point you in another direction. I'm doing this because to me, this looks like a classic case of someone trying to find a solution to the wrong problem. I'm saying this because based on the code and log snippets you've provided, you're jumping through hoops to pass a parameter (in your case the name of a plan) via multiple actions – which, if I'm right, is just unnecessary.
Here's what I would do instead:
<% #plans.each do |plan| %>
<%=
link_to 'Select Plan',
new_affiliate_registration_path(plan: plan.downcase),
class: 'some-button-class
%>
<% end %>
This way, you don't have to mess around in your controllers in any way. Also, since there is no POST request, you won't have any issues with form (re)population and such things.