allow to disable completed submission emails

app/controllers/user_configs_controller.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+class UserConfigsController < ApplicationController
+  before_action :load_user_config
+  authorize_resource :user_config
+
+  ALLOWED_KEYS = [
+    UserConfig::RECEIVE_COMPLETED_EMAIL
+  ].freeze
+
+  def create
+    @user_config.update!(user_config_params)
+
+    head :ok
+  end
+
+  private
+
+  def load_user_config
+    return head :not_found unless ALLOWED_KEYS.include?(user_config_params[:key])
+
+    @user_config =
+      UserConfig.find_or_initialize_by(user: current_user, key: user_config_params[:key])
+  end
+
+  def user_config_params
+    params.required(:user_config).permit!.tap do |attrs|
+      attrs[:value] = attrs[:value] == '1' if attrs[:value].in?(%w[1 0])
+    end
+  end
+end

app/views/notifications_settings/index.html.erb

@@ -2,6 +2,20 @@
   <%= render 'shared/settings_nav' %>
   <div class="flex-grow max-w-xl mx-auto">
     <h1 class="text-4xl font-bold mb-4">Email Notifications</h1>
+    <div class="mt-2 mb-1">
+      <% user_config = UserConfig.find_or_initialize_by(user: current_user, key: UserConfig::RECEIVE_COMPLETED_EMAIL) %>
+      <% if can?(:manage, user_config) %>
+        <%= form_for user_config, url: user_configs_path, method: :post do |f| %>
+          <%= f.hidden_field :key %>
+          <div class="flex items-center justify-between">
+            <span>
+              Receive notification emails on completed submission
+            </span>
+            <%= f.check_box :value, class: 'toggle', checked: user_config.value != false, onchange: 'this.form.requestSubmit()' %>
+          </div>
+        <% end %>
+      <% end %>
+    </div>
     <%= render 'email_stats' %>
     <%= render 'bcc_form', config: @bcc_config %>
     <div class="flex justify-between items-end mb-4 mt-8">

config/routes.rb

@@ -53,6 +53,7 @@ Rails.application.routes.draw do
   resources :verify_pdf_signature, only: %i[create]
   resource :mfa_setup, only: %i[show new edit create destroy], controller: 'mfa_setup'
   resources :account_configs, only: %i[create]
+  resources :user_configs, only: %i[create]
   resources :encrypted_user_configs, only: %i[destroy]
   resources :timestamp_server, only: %i[create]
   resources :dashboard, only: %i[index]