Rails test error when attempting to find associated model in test - ruby-on-rails

Question

I am making an online library system with Ruby on Rails. Currently users can sign up, but to do so they must first choose a type of subscription plan.
In the end, the best way I found to do this, was to pass a plan_id like so:
config/routes.rb
get 'subscribe/paperback2u', to: 'members#new', :plan_id => 1
get 'subscribe/paperback4u', to: 'members#new', :plan_id => 2
get 'subscribe/paperback6u', to: 'members#new', :plan_id => 3
Then, members/new.html.erb pulls the form partial, which looks like this:
<%= form_with(model: member, local: true) do |form| %>
<% plan_id = params[:plan_id] %>
<div class="field form-group">
<%= form.label :first_name, "First Name" %>
<%= form.text_field :first_name,
id: :member_first_name,
:class => "form-control",
:required => true %>
</div>
<div class="field form-group">
<%= form.label :last_name, "Last Name" %>
<%= form.text_field :last_name,
id: :member_last_name,
:class => "form-control",
:required => true %>
</div>
<div class="field form-group">
<%= form.label :address_line_1, "Address Line 1" %>
<%= form.text_field :address_line_1,
id: :member_address_line_1,
:class => "form-control",
:required => true %>
</div>
<div class="field form-group">
<%= form.label :address_line_2, "Address Line 2" %>
<%= form.text_field :address_line_2,
id: :member_address_line_2,
:class => "form-control" %>
</div>
<div class="field form-group">
<%= form.label :town %>
<%= form.text_field :town,
id: :member_town,
:class => "form-control",
:required => true %>
</div>
And the other fields for the member model.
Then we get to:
98 <%= form.hidden_field :plan_id, value: params[:plan_id] %>
100 <% if form.object.new_record? %>
101 <%= render 'stripe-form' %>
102 <% end %>
I don't think line 98 is doing anything, to be honest.
Then the stripe-form partial looks like this:
1 <div class="text-center">
2 <script src="https://checkout.stripe.com/checkout.js" class="stripe-button btn-primary"
3 data-key="<%= Rails.configuration.stripe[:publishable_key] %>"
4 data-description="Subscribe to ReadAll Library"
5 data-amount=<%= (Plan.find(params["plan_id"].to_i).display_price) * 100 %>
6 data-currency="gbp"
7 data-panelLabel="Subscribe for"
8 data-label="Subscribe"
9 data-locale="auto"></script>
10 </div>
The error I am getting is:
Error:
MembersControllerTest#test_should_get_new:
ActionView::Template::Error: Couldn't find Plan with 'id'=1
app/views/members/_stripe-form.html.erb:5:in `_app_views_members__stripe_form_html_erb___374722773566915779_70180218242520'
app/views/members/_form.html.erb:101:in `block in _app_views_members__form_html_erb__2640496602018942691_70180179508500'
app/views/members/_form.html.erb:1:in `_app_views_members__form_html_erb__2640496602018942691_70180179508500'
app/views/members/new.html.erb:5:in `_app_views_members_new_html_erb___3025732295195500162_70180218177380'
test/controllers/members_controller_test.rb:16:in `block in <class:MembersControllerTest>'
The error I get if I add puts response.body in the tests is: "Plan must exist". Which it does! I have 3 different plans in my plans table. Each one has an ID, and everything works when I actually run it. It's just the test that doesn't work. I'd scrap the test if I could, but I need it as documentation for a project.
Finally, here's my Plan.rb and Member.rb
`plan.rb`
class Plan < ApplicationRecord
has_many :members
end
`member.rb`
class Member < User
1 require 'stripe'
2
3 before_save :set_type
4
5 belongs_to :plan
6
7
8 def set_type
9 self.type = "Member"
10 end
11
12 end
And the schema for the two:
create_table "plans", force: :cascade do |t|
t.string "stripe_id"
t.string "nickname"
t.decimal "display_price"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "product"
end
create_table "users", force: :cascade do |t|
bunch of user attributes (first_name, address, etc)
t.string "type" (members is a users type)
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "remember_digest"
t.string "customer_id"
t.bigint "plan_id"
t.index ["email"], name: "index_users_on_email", unique: true
t.index ["plan_id"], name: "index_users_on_plan_id"
end
I'm out of ideas. I appreciate any help you guys can give me. Cheers.

Answer 1

In your view, if you want that your user choose from the form, you could add the select input and let the user select what plan they want. But it's all possible that you pass this information through URL, as you already did.
View:
<%= form_with(model: member, local: true) do |form| %>
<div class="field form-group">
<%= form.label :first_name, "First Name" %>
<%= form.text_field :first_name,
id: :member_first_name,
:class => "form-control",
:required => true %>
</div>
<div class="field form-group">
<%= form.label :plan, "Choose your plan" %>
<%= form.select :plan_id,
Plan.all {|p| [ p.name, p.id ]},
{ include_blank: false, selected: form.object.plan_id }, class: 'form-control' %>
</div>
<%= f.submit "Salvar", class: "btn btn-primary" %>
<% end %>
I believe the rest you already did it. In the controller you add to the white list of params the plan_id, and in your model you add model relations as has_many and belong. P.s: I didn't test this.