Adds a "Discard all" button to queue show page, if there are enqueued…

… jobs

app/controllers/mission_control/jobs/queues/discards_controller.rb

@@ -0,0 +1,9 @@
+class MissionControl::Jobs::Queues::DiscardsController < MissionControl::Jobs::ApplicationController
+  include MissionControl::Jobs::QueueScoped
+
+  def create
+    @queue.clear
+
+    redirect_to application_queues_url(@application)
+  end
+end

app/views/mission_control/jobs/queues/_actions.html.erb

@@ -1,4 +1,7 @@
 <div class="buttons is-right">
+  <% if queue.size.positive? %>
+    <%= button_to "Discard all", application_queue_discard_path(@application, queue.name), method: :post, class: "button is-danger is-light mr-0", form: { data: { turbo_confirm: "This will delete #{queue.size} pending jobs in the queue and can't be undone. Are you sure?" } } %>
+  <% end %>
   <% if queue.active? %>
     <%= button_to "Pause", application_queue_pause_path(@application, queue.name), method: :post, class: "button is-success is-light mr-0" %>
   <% else %>

config/routes.rb

@@ -2,6 +2,7 @@
   resources :applications, only: [] do
     resources :queues, only: [ :index, :show ] do
       scope module: :queues do
+        resource :discard, only: :create
         resource :pause, only: [ :create, :destroy ]
       end
     end

test/system/discard_queue_jobs_test.rb

@@ -0,0 +1,20 @@
+require_relative "../application_system_test_case"
+
+class DiscardQueueJobsTest < ApplicationSystemTestCase
+  setup do
+    DummyJob.queue_as :queue_1
+    10.times { |index| DummyJob.perform_later("dummy-arg-#{index}") }
+
+    visit queues_path
+  end
+
+  test "discard all jobs" do
+    click_on "queue_1"
+
+    assert_equal 10, job_row_elements.length
+
+    accept_confirm do
+      click_on "Discard all"
+    end
+  end
+end