install symfony demo with installer

app/src/Entity/Post.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Entity;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
+use Symfony\Component\Validator\Constraints as Assert;
+
+/**
+ * @ORM\Entity(repositoryClass="App\Repository\PostRepository")
+ * @ORM\Table(name="symfony_demo_post")
+ * @UniqueEntity(fields={"slug"}, errorPath="title", message="post.slug_unique")
+ *
+ * Defines the properties of the Post entity to represent the blog posts.
+ *
+ * See https://symfony.com/doc/current/doctrine.html#creating-an-entity-class
+ *
+ * Tip: if you have an existing database, you can generate these entity class automatically.
+ * See https://symfony.com/doc/current/doctrine/reverse_engineering.html
+ *
+ * @author Ryan Weaver <weaverryan@gmail.com>
+ * @author Javier Eguiluz <javier.eguiluz@gmail.com>
+ * @author Yonel Ceruto <yonelceruto@gmail.com>
+ */
+class Post
+{
+    /**
+     * @var int
+     *
+     * @ORM\Id
+     * @ORM\GeneratedValue
+     * @ORM\Column(type="integer")
+     */
+    private $id;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="string")
+     * @Assert\NotBlank
+     */
+    private $title;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="string")
+     */
+    private $slug;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="string")
+     * @Assert\NotBlank(message="post.blank_summary")
+     * @Assert\Length(max=255)
+     */
+    private $summary;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="text")
+     * @Assert\NotBlank(message="post.blank_content")
+     * @Assert\Length(min=10, minMessage="post.too_short_content")
+     */
+    private $content;
+
+    /**
+     * @var \DateTime
+     *
+     * @ORM\Column(type="datetime")
+     */
+    private $publishedAt;
+
+    /**
+     * @var User
+     *
+     * @ORM\ManyToOne(targetEntity="App\Entity\User")
+     * @ORM\JoinColumn(nullable=false)
+     */
+    private $author;
+
+    /**
+     * @var Comment[]|Collection
+     *
+     * @ORM\OneToMany(
+     *      targetEntity="Comment",
+     *      mappedBy="post",
+     *      orphanRemoval=true,
+     *      cascade={"persist"}
+     * )
+     * @ORM\OrderBy({"publishedAt": "DESC"})
+     */
+    private $comments;
+
+    /**
+     * @var Tag[]|Collection
+     *
+     * @ORM\ManyToMany(targetEntity="App\Entity\Tag", cascade={"persist"})
+     * @ORM\JoinTable(name="symfony_demo_post_tag")
+     * @ORM\OrderBy({"name": "ASC"})
+     * @Assert\Count(max="4", maxMessage="post.too_many_tags")
+     */
+    private $tags;
+
+    public function __construct()
+    {
+        $this->publishedAt = new \DateTime();
+        $this->comments = new ArrayCollection();
+        $this->tags = new ArrayCollection();
+    }
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function getTitle(): ?string
+    {
+        return $this->title;
+    }
+
+    public function setTitle(?string $title): void
+    {
+        $this->title = $title;
+    }
+
+    public function getSlug(): ?string
+    {
+        return $this->slug;
+    }
+
+    public function setSlug(string $slug): void
+    {
+        $this->slug = $slug;
+    }
+
+    public function getContent(): ?string
+    {
+        return $this->content;
+    }
+
+    public function setContent(?string $content): void
+    {
+        $this->content = $content;
+    }
+
+    public function getPublishedAt(): \DateTime
+    {
+        return $this->publishedAt;
+    }
+
+    public function setPublishedAt(\DateTime $publishedAt): void
+    {
+        $this->publishedAt = $publishedAt;
+    }
+
+    public function getAuthor(): ?User
+    {
+        return $this->author;
+    }
+
+    public function setAuthor(User $author): void
+    {
+        $this->author = $author;
+    }
+
+    public function getComments(): Collection
+    {
+        return $this->comments;
+    }
+
+    public function addComment(Comment $comment): void
+    {
+        $comment->setPost($this);
+        if (!$this->comments->contains($comment)) {
+            $this->comments->add($comment);
+        }
+    }
+
+    public function removeComment(Comment $comment): void
+    {
+        $this->comments->removeElement($comment);
+    }
+
+    public function getSummary(): ?string
+    {
+        return $this->summary;
+    }
+
+    public function setSummary(?string $summary): void
+    {
+        $this->summary = $summary;
+    }
+
+    public function addTag(Tag ...$tags): void
+    {
+        foreach ($tags as $tag) {
+            if (!$this->tags->contains($tag)) {
+                $this->tags->add($tag);
+            }
+        }
+    }
+
+    public function removeTag(Tag $tag): void
+    {
+        $this->tags->removeElement($tag);
+    }
+
+    public function getTags(): Collection
+    {
+        return $this->tags;
+    }
+}