[Dmails] Add route to mark single dmail read

app/controllers/dmails_controller.rb

@@ -1,6 +1,6 @@
 class DmailsController < ApplicationController
   respond_to :html
-  respond_to :json, only: %i[index show destroy mark_all_as_read]
+  respond_to :json, only: %i[index show destroy mark_as_read mark_all_as_read]
   before_action :member_only
 
   def new
@@ -44,6 +44,12 @@ class DmailsController < ApplicationController
     redirect_to dmails_path, :notice => "Message destroyed"
   end
 
+  def mark_as_read
+    @dmail = Dmail.find(params[:id])
+    check_privilege(@dmail)
+    @dmail.mark_as_read!
+  end
+
   def mark_all_as_read
     Dmail.visible.unread.each do |x|
       x.update_column(:is_read, true)

config/routes.rb

@@ -129,6 +129,9 @@ Rails.application.routes.draw do
     end
   end
   resources :dmails, :only => [:new, :create, :index, :show, :destroy] do
+    member do
+      post :mark_as_read
+    end
     collection do
       post :mark_all_as_read
     end

test/functional/dmails_controller_test.rb

@@ -71,6 +71,14 @@ class DmailsControllerTest < ActionDispatch::IntegrationTest
       end
     end
 
+    context "mark as read action" do
+      should "mark the dmail as read" do
+        post_auth mark_as_read_dmail_path(@dmail), @dmail.owner, params: { format: :json }
+        assert_response :success
+        assert_predicate @dmail.reload, :is_read?
+      end
+    end
+
     context "create action" do
       setup do
         @user_2 = create(:user)