Extract Users::JoinsController from overloaded UsersController

Good code smell is when the before_action callbacks stack up but can't
be shared across actions

app/controllers/concerns/authorization.rb

@@ -29,7 +29,7 @@ module Authorization
       if Current.membership.blank?
         redirect_to session_menu_url(script_name: nil)
       elsif Current.user.nil? && Current.membership.join_code.present?
-        redirect_to new_user_path
+        redirect_to new_users_join_path
       elsif !Current.user&.active?
         redirect_to unlink_membership_url(script_name: nil, membership_id: Current.membership.signed_id(purpose: :unlinking))
       end

app/controllers/users/joins_controller.rb

@@ -0,0 +1,32 @@
+class Users::JoinsController < ApplicationController
+  require_access_without_a_user
+
+  before_action :set_join_code, :ensure_join_code_is_valid
+
+  def new
+  end
+
+  def create
+    @join_code.redeem do
+      User.create!(user_params.merge(membership: Current.membership))
+    end
+
+    redirect_to root_path
+  end
+
+  private
+    def set_join_code
+      @join_code = Account::JoinCode.active.find_by(code: Current.membership.join_code)
+    end
+
+    def ensure_join_code_is_valid
+      unless @join_code&.active?
+        redirect_to unlink_membership_url(script_name: nil, membership_id: Current.membership.signed_id(purpose: :unlinking))
+      end
+    end
+
+    def user_params
+      params.expect(user: [ :name, :avatar ])
+    end
+end
+

app/controllers/users_controller.rb

@@ -1,21 +1,7 @@
 class UsersController < ApplicationController
-  require_access_without_a_user only: %i[ new create ]
-
-  before_action :set_join_code, :ensure_join_code_is_valid, only: %i[ new create ]
   before_action :set_user, only: %i[ show edit update destroy ]
   before_action :ensure_permission_to_change_user, only: %i[ update destroy ]
 
-  def new
-  end
-
-  def create
-    @join_code.redeem do
-      User.create!(user_params.merge(membership: Current.membership))
-    end
-
-    redirect_to root_path
-  end
-
   def edit
   end
 
@@ -33,16 +19,6 @@ class UsersController < ApplicationController
   end
 
   private
-    def set_join_code
-      @join_code = Account::JoinCode.active.find_by(code: Current.membership.join_code)
-    end
-
-    def ensure_join_code_is_valid
-      unless @join_code&.active?
-        redirect_to unlink_membership_url(script_name: nil, membership_id: Current.membership.signed_id(purpose: :unlinking))
-      end
-    end
-
     def set_user
       @user = User.active.find(params[:id])
     end

app/views/users/joins/new.html.erb

@@ -5,10 +5,11 @@
     <h1 class="txt-x-large font-weight-black margin-none">
       <%= @page_title %>
     </h1>
+
     <p class="margin-none-block-start">Enter your name to continue</p>
   </header>
 
-  <%= form_with scope: "user", url: users_path(membership: params[:membership]), class: "flex flex-column gap txt-medium", data: { controller: "form" } do |form| %>
+  <%= form_with scope: "user", url: users_joins_path(membership: params[:membership]), class: "flex flex-column gap txt-medium", data: { controller: "form" } do |form| %>
     <div class="flex align-center gap">
       <label class="flex align-center gap input input--actor">
         <%= form.text_field :name, class: "input full-width", autocomplete: "name", placeholder: "Name", autofocus: true, required: true, data: { "1p-ignore": true } %>

config/routes.rb

@@ -128,6 +128,10 @@ Rails.application.routes.draw do
   get "join/:tenant/:code", to: "join_codes#new", as: :join
   post "join/:tenant/:code", to: "join_codes#create"
 
+  namespace :users do
+    resources :joins
+  end
+
   resource :session do
     scope module: "sessions" do
       resources :transfers

test/controllers/users/joins_controller_test.rb

@@ -0,0 +1,32 @@
+require "test_helper"
+
+class Users::JoinsControllerTest < ActionDispatch::IntegrationTest
+  test "new" do
+    identity = Identity.create!(email_address: "new.user@example.com")
+    identity.memberships.create(tenant: ApplicationRecord.current_tenant, join_code: Account::JoinCode.sole.code)
+    sign_in_as identity
+
+    get new_users_join_path
+    assert_response :ok
+  end
+
+  test "new with invalid params" do
+    identity = Identity.create!(email_address: "new.user@example.com")
+    membership = identity.memberships.create(tenant: ApplicationRecord.current_tenant, join_code: "PHONY")
+    sign_in_as identity
+
+    get new_users_join_path
+    assert_redirected_to unlink_membership_url(script_name: nil, membership_id: membership.signed_id(purpose: :unlinking))
+  end
+
+  test "create" do
+    identity = Identity.create!(email_address: "newart.userbaum@example.com")
+    identity.memberships.create(tenant: ApplicationRecord.current_tenant, join_code: Account::JoinCode.sole.code)
+    sign_in_as identity
+
+    assert_difference -> { User.count }, +1 do
+      post users_joins_path, params: { user: { name: "Newart Userbaum" } }
+      assert_redirected_to root_path
+    end
+  end
+end

test/controllers/users_controller_test.rb

@@ -1,35 +1,6 @@
 require "test_helper"
 
 class UsersControllerTest < ActionDispatch::IntegrationTest
-  test "new" do
-    identity = Identity.create!(email_address: "new.user@example.com")
-    identity.memberships.create(tenant: ApplicationRecord.current_tenant, join_code: Account::JoinCode.sole.code)
-    sign_in_as identity
-
-    get new_user_path
-    assert_response :ok
-  end
-
-  test "new with invalid params" do
-    identity = Identity.create!(email_address: "new.user@example.com")
-    membership = identity.memberships.create(tenant: ApplicationRecord.current_tenant, join_code: "PHONY")
-    sign_in_as identity
-
-    get new_user_path
-    assert_redirected_to unlink_membership_url(script_name: nil, membership_id: membership.signed_id(purpose: :unlinking))
-  end
-
-  test "create" do
-    identity = Identity.create!(email_address: "newart.userbaum@example.com")
-    identity.memberships.create(tenant: ApplicationRecord.current_tenant, join_code: Account::JoinCode.sole.code)
-    sign_in_as identity
-
-    assert_difference -> { User.count }, +1 do
-      post users_path, params: { user: { name: "Newart Userbaum" } }
-      assert_redirected_to root_path
-    end
-  end
-
   test "show" do
     sign_in_as :kevin