feature #163 Add flash messages (voronkovich, javiereguiluz)

This PR was merged into the master branch.

Discussion
----------

Add flash messages

This finishes #158 by simplifying its contents.

Commits
-------

3eefa76 Reworded the help note about flash messages
9a8d43d Check if the session exists before reading flash messages
d01311b Transformed the macro() of the Flash messages into a regular include() template
f481eef Refactored the template code related to macros
da04216 Fixed an issue with the translation file after the rebase
51f7262 Restored the content database
7507a50 Simplified the template code used to render flash messages
a46c948 Use 'success' as the name of the messages related to success messages
12bd670 Update Russian and English translations
0680841 Show flash messages after creating, updating and deleting posts

Author: javiereguiluz

app/Resources/translations/messages.en.xliff

@@ -199,6 +199,18 @@
                 <source>post.no_posts_found</source>
                 <target>No posts found.</target>
             </trans-unit>
+            <trans-unit id="post.created_successfully">
+                <source>post.created_successfully</source>
+                <target>Post created successfully!</target>
+            </trans-unit>
+            <trans-unit id="post.updated_successfully">
+                <source>post.updated_successfully</source>
+                <target>Post updated successfully!</target>
+            </trans-unit>
+            <trans-unit id="post.deleted_successfully">
+                <source>post.deleted_successfully</source>
+                <target>Post deleted successfully!</target>
+            </trans-unit>
 
             <trans-unit id="help.app_description">
                 <source>help.app_description</source>

app/Resources/translations/messages.ru.xliff

@@ -198,6 +198,17 @@
             <trans-unit id="post.no_posts_found">
                 <source>post.no_posts_found</source>
                 <target>Ни одной записи не найдено.</target>
+            <trans-unit id="post.created_successfully">
+                <source>post.created_successfully</source>
+                <target>Запись успешно создана!</target>
+            </trans-unit>
+            <trans-unit id="post.updated_successfully">
+                <source>post.updated_successfully</source>
+                <target>Запись успешно обновлена!</target>
+            </trans-unit>
+            <trans-unit id="post.deleted_successfully">
+                <source>post.deleted_successfully</source>
+                <target>Запись успешно удалена!</target>
             </trans-unit>
 
             <trans-unit id="help.app_description">

app/Resources/views/admin/blog/edit.html.twig

@@ -5,6 +5,8 @@
 {% block main %}
     <h1>{{ 'title.edit_post'|trans({'%id%': post.id}) }}</h1>
 
+    {{ include('default/_flash_messages.html.twig') }}
+
     {{ include('admin/blog/_form.html.twig', {
         form: edit_form,
         button_label: 'action.save'|trans,

app/Resources/views/admin/blog/index.html.twig

@@ -5,6 +5,8 @@
 {% block main %}
     <h1>{{ 'title.post_list'|trans }}</h1>
 
+    {{ include('default/_flash_messages.html.twig') }}
+
     <table class="table table-striped">
         <thead>
             <tr>

app/Resources/views/default/_flash_messages.html.twig

@@ -0,0 +1,14 @@
+{% if app.session.started %}
+    <div class="messages">
+        {% for message in app.session.flashBag.get('success') %}
+            {# Bootstrap alert, see http://getbootstrap.com/components/#alerts #}
+            <div class="alert alert-dismissible alert-success" role="alert">
+                <button type="button" class="close" data-dismiss="alert" aria-label="Close">
+                    <span aria-hidden="true">&times;</span>
+                </button>
+
+                {{ message|trans }}
+            </div>
+        {% endfor %}
+    </div>
+{% endif %}

src/AppBundle/Controller/Admin/BlogController.php

@@ -87,6 +87,12 @@ public function newAction(Request $request)
             $em->persist($post);
             $em->flush();
 
+            // Flash messages are used to notify the user about the result of the
+            // actions. They are deleted automatically from the session as soon
+            // as they are accessed.
+            // See http://symfony.com/doc/current/book/controller.html#flash-messages
+            $this->addFlash('success', 'post.created_successfully');
+
             return $this->redirectToRoute('admin_post_index');
         }
 
@@ -142,6 +148,8 @@ public function editAction(Post $post, Request $request)
             $post->setSlug($this->get('slugger')->slugify($post->getTitle()));
             $em->flush();
 
+            $this->addFlash('success', 'post.updated_successfully');
+
             return $this->redirectToRoute('admin_post_edit', array('id' => $post->getId()));
         }
 
@@ -173,6 +181,8 @@ public function deleteAction(Request $request, Post $post)
 
             $em->remove($post);
             $em->flush();
+
+            $this->addFlash('success', 'post.deleted_successfully');
         }
 
         return $this->redirectToRoute('admin_post_index');