don't allow to delete message while being sent

app/controllers/message_drafts_controller.rb

@@ -32,9 +32,12 @@ def destroy
     # redirect_path = @message.original_message.present? ? message_thread_path(@message.original_message.thread) : message_drafts_path
     redirect_path = @message.original_message.present? ? message_thread_path(@message.original_message.thread) : message_threads_path
 
-    @message.destroy
-
-    redirect_to redirect_path, notice: "Správa bola zahodená"
+    if @message.not_yet_submitted?
+      @message.destroy
+      redirect_to redirect_path, notice: "Správa bola zmazaná"
+    else
+      redirect_to redirect_path, alert: "Správu nie je možné zmazať po zaradení na odoslanie"
+    end
   end
 
   def unlock

app/controllers/message_threads/bulk/message_drafts_controller.rb

@@ -28,7 +28,7 @@ def destroy
         message_drafts_to_destroy_ids = message_threads.map(&:message_drafts).flatten.map(&:id)
 
         message_threads.transaction do
-          MessageDraft.where(id: message_drafts_to_destroy_ids).destroy_all
+          MessageDraft.not_in_submission_process.where(id: message_drafts_to_destroy_ids).destroy_all
         end
 
         if message_drafts_to_destroy_ids.present?

test/controllers/message_drafts_controller_test.rb

@@ -0,0 +1,25 @@
+require 'test_helper'
+
+class MessageDraftsControllerTest < ActionController::TestCase
+  setup do
+    session[:login_expires_at] = Time.now + 1.day
+    Current.user = users(:basic)
+    session[:user_id] = Current.user.id
+  end
+  test "should destroy draft with status created" do
+    # draft should be destroyed if not yet submitted
+    message_draft = messages(:ssd_main_draft)
+    delete :destroy, params: { id: message_draft.id }
+    assert_raises(ActiveRecord::RecordNotFound) do
+      MessageDraft.find(message_draft.id)
+    end
+  end
+  test "should not destroy draft that is being submitted" do
+    message_draft = messages(:ssd_main_draft)
+    message_draft.metadata[:status] = "being_submitted"
+    message_draft.save!
+    delete :destroy, params: { id: message_draft.id }
+    assert_equal "Správu nie je možné zmazať po zaradení na odoslanie", flash[:alert]
+    assert MessageDraft.exists?(message_draft.id)
+  end
+end