Add tags to posts with many-to-many relation

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

@@ -10,6 +10,13 @@
                     {{ post.title }}
                 </a>
             </h2>
+            {% if 0 < post.tags | length %}
+                <p>
+                    {% for tag in post.tags %}
+                        <span class="label label-default">{{ tag.name }}</span>
+                    {% endfor %}
+                </p>
+            {% endif %}
 
             {{ post.summary|md2html }}
         </article>

app/Resources/views/blog/post_show.html.twig

@@ -5,6 +5,14 @@
 {% block main %}
     <h1>{{ post.title }}</h1>
 
+    {% if 0 < post.tags | length %}
+        <p> Tags:
+            {% for tag in post.tags %}
+                <span class="label label-default">{{ tag.name }}</span>
+            {% endfor %}
+        </p>
+    {% endif %}
+
     {{ post.content|md2html }}
 
     <div id="post-add-comment" class="well">

src/AppBundle/DataFixtures/ORM/LoadFixtures.php

@@ -11,9 +11,11 @@
 
 namespace AppBundle\DataFixtures\ORM;
 
+use AppBundle\Entity\Tag;
 use AppBundle\Entity\User;
 use AppBundle\Entity\Post;
 use AppBundle\Entity\Comment;
+use Doctrine\Common\DataFixtures\AbstractFixture;
 use Doctrine\Common\DataFixtures\FixtureInterface;
 use Doctrine\Common\Persistence\ObjectManager;
 use Symfony\Component\DependencyInjection\ContainerAwareInterface;
@@ -29,6 +31,7 @@
  *
  * @author Ryan Weaver <[email protected]>
  * @author Javier Eguiluz <[email protected]>
+ * @author Rasanga Perera <[email protected]>
  */
 class LoadFixtures implements FixtureInterface, ContainerAwareInterface
 {
@@ -41,7 +44,11 @@ class LoadFixtures implements FixtureInterface, ContainerAwareInterface
     public function load(ObjectManager $manager)
     {
         $this->loadUsers($manager);
-        $this->loadPosts($manager);
+        $this->loadPostsTags(
+            $manager,
+            $this->loadPosts($manager),
+            $this->loadTags($manager)
+        );
     }
 
     private function loadUsers(ObjectManager $manager)
@@ -66,8 +73,15 @@ private function loadUsers(ObjectManager $manager)
         $manager->flush();
     }
 
+    /**
+     * @param ObjectManager $manager
+     *
+     * @return array
+     */
     private function loadPosts(ObjectManager $manager)
     {
+        $posts = array();
+
         foreach (range(1, 30) as $i) {
             $post = new Post();
 
@@ -91,9 +105,94 @@ private function loadPosts(ObjectManager $manager)
             }
 
             $manager->persist($post);
+
+            $posts[] = $post;
+        }
+
+        $manager->flush();
+
+        return $posts;
+    }
+
+    /**
+     * @param ObjectManager $manager
+     *
+     * @return array
+     */
+    private function loadTags(ObjectManager $manager)
+    {
+        $tags = array();
+        $tagNames = array(
+            'Lorem',
+            'ipsum',
+            'consectetur',
+            'adipiscing',
+            'incididunt',
+            'labore',
+            'voluptate'
+        );
+
+        foreach ($tagNames as $key => $name) {
+            $tag = new Tag();
+            $tag->setName($name);
+
+            $manager->persist($tag);
+
+            $tags[] = $tag;
         }
 
         $manager->flush();
+
+        return $tags;
+    }
+
+    /**
+     * @param ObjectManager $manager
+     * @param array|Post[] $posts
+     * @param array|Tag[] $tags
+     */
+    private function loadPostsTags(
+        ObjectManager $manager,
+        array $posts,
+        array $tags
+    ) {
+        $posts[0]->addTag($tags[0]);
+        $posts[0]->addTag($tags[2]);
+        $manager->persist($posts[0]);
+
+        $posts[1]->addTag($tags[1]);
+        $manager->persist($posts[1]);
+
+        $posts[2]->addTag($tags[2]);
+        $posts[2]->addTag($tags[3]);
+        $posts[2]->addTag($tags[4]);
+        $manager->persist($posts[2]);
+
+        $posts[3]->addTag($tags[5]);
+        $posts[3]->addTag($tags[6]);
+        $manager->persist($posts[3]);
+
+        $posts[4]->addTag($tags[0]);
+        $manager->persist($posts[4]);
+
+        $posts[5]->addTag($tags[0]);
+        $manager->persist($posts[5]);
+
+        $posts[6]->addTag($tags[2]);
+        $manager->persist($posts[6]);
+
+        $posts[7]->addTag($tags[4]);
+        $posts[7]->addTag($tags[6]);
+        $manager->persist($posts[7]);
+
+        $posts[8]->addTag($tags[0]);
+        $manager->persist($posts[8]);
+
+        $posts[9]->addTag($tags[3]);
+        $posts[9]->addTag($tags[5]);
+        $manager->persist($posts[9]);
+
+        $manager->flush();
     }
 
     /**

src/AppBundle/Entity/Post.php

@@ -2,6 +2,7 @@
 
 namespace AppBundle\Entity;
 
+use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
 use Doctrine\Common\Collections\ArrayCollection;
 use Symfony\Component\Validator\Constraints as Assert;
@@ -18,6 +19,7 @@
  *
  * @author Ryan Weaver <[email protected]>
  * @author Javier Eguiluz <[email protected]>
+ * @author Rasanga Perera <[email protected]>
  */
 class Post
 {
@@ -81,10 +83,21 @@ class Post
      */
     private $comments;
 
+    /**
+     * @var Collection|Tag[]
+     *
+     * @ORM\ManyToMany(
+     *      targetEntity="Tag"
+     * )
+     * @ORM\JoinTable(name="posts_tags")
+     */
+    private $tags;
+
     public function __construct()
     {
         $this->publishedAt = new \DateTime();
         $this->comments = new ArrayCollection();
+        $this->tags = new ArrayCollection();
     }
 
     public function getId()
@@ -179,4 +192,56 @@ public function setSummary($summary)
     {
         $this->summary = $summary;
     }
+
+    /**
+     * Get tags
+     *
+     * @return Tag[]|Collection
+     */
+    public function getTags()
+    {
+        return $this->tags;
+    }
+
+    /**
+     * Add tag
+     *
+     * @param Tag $tag
+     *
+     * @return Post
+     */
+    public function addTag(Tag $tag)
+    {
+        if (!$this->hasTag($tag)) {
+            $this->tags->add($tag);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Remove tag
+     *
+     * @param Tag $tag
+     *
+     * @return Post
+     */
+    public function removeTag(Tag $tag)
+    {
+        if (!$this->hasTag($tag)) {
+            $this->tags->removeElement($tag);
+        }
+
+        return $this;
+    }
+
+    /**
+     * @param Tag $tag
+     *
+     * @return bool
+     */
+    public function hasTag(Tag $tag)
+    {
+        return $this->tags->contains($tag);
+    }
 }

src/AppBundle/Entity/Tag.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace AppBundle\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Validator\Constraints as Assert;
+
+/**
+ * Tag
+ *
+ * @ORM\Entity(repositoryClass="AppBundle\Repository\TagRepository")
+ *
+ * Defines the properties of the Tag entity to represent the blog post tag.
+ * See http://symfony.com/doc/current/book/doctrine.html#creating-an-entity-class
+ *
+ * @author Rasanga Perera <[email protected]>
+ */
+class Tag
+{
+    /**
+     * @var integer
+     *
+     * @ORM\Column(name="id", type="integer")
+     * @ORM\Id
+     * @ORM\GeneratedValue(strategy="AUTO")
+     */
+    private $id;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="string", length=255)
+     * @Assert\NotBlank()
+     */
+    private $name;
+
+    /**
+     * Get id
+     *
+     * @return integer 
+     */
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    /**
+     * Set name
+     *
+     * @param string $name
+     *
+     * @return Tag
+     */
+    public function setName($name)
+    {
+        $this->name = $name;
+
+        return $this;
+    }
+
+    /**
+     * Get name
+     *
+     * @return string 
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+}