About the implementation of symfony (doctrine) table reuse

Question

There are four tables

Articles：(id, body)
Questions (id, body)
Votes (id, user_id, votable_id, vote_type)
comments(id, user_id, body, commentable_id, comment_type)

vote stores users’ like records for Articles and Questions; use vote_type to distinguish whether the stored records are likes for articles or questions

id	user_id	votable_id	vote_type	illustrate
1	2	1	article	This record indicates that user 2 liked article 1
1	2	1	question	This record indicates that user 2 liked question 1

comments stores user response records to Articles and Questions; use commentable_type to distinguish whether the stored records are responses to articles or questions

id	user_id	commentable_id	comment_type	illustrate
1	2	1	article	This record represents user 2’s reply to article 1
1	2	1	question	This record represents user 2’s reply to question 1

End of background;

So how to declare the mapping relationship between them;

use Doctrine\ORM\Mapping as ORM;
/**
 * @ORM\Entity
 * @ORM\Table(name="articles")
 */
class Article
{
   //...
    /**
     *
     * @ORM\OneToMany(targetEntity="Vote", mappedBy="votable")
     */
    $votes;
}

class Vote
{
   //...
    /**
     *
     * @ORM\ManyToOne(targetEntity="Article|Question?", inversedBy="votes")
     */
    $votes;
}

Answer 1

use Doctrine\ORM\Mapping as ORM;
/**
 * @ORM\Entity
 * @ORM\Table(name="articles")
 */
class Article
{
    // ...
}

/**
 * @ORM\Entity
 * @ORM\Table(name="articles")
 */
class ArticleVote extends Article
{
    /**
     *
     * @OneToMany(targetEntity="VoteArticle", mappedBy="votable_id")
     */
    private $id;
}

/**
 * @ORM\Entity
 * @ORM\Table(name="articles")
 */
class ArticleComment extends Article
{
    /**
     *
     * @OneToMany(targetEntity="CommentArticle", mappedBy="commentable_id")
     */
    private $id;
}

/**
 * @ORM\Entity
 * @ORM\Table(name="votes")
 */
class Vote
{
    // ...
}

/**
 * @ORM\Entity
 * @ORM\Table(name="votes")
 */
class VoteArticle
{
    /**
     *
     * @ORM\ManyToOne(targetEntity="ArticleVote", inversedBy="id")
     */
    private $votable_id;
}

/**
 * @ORM\Entity
 * @ORM\Table(name="comments")
 */
class Comment
{
    // ...
}

/**
 * @ORM\Entity
 * @ORM\Table(name="comments")
 */
class CommentArticle
{
    /**
     *
     * @ORM\ManyToOne(targetEntity="ArticleComment", inversedBy="id")
     */
    private $commentable_id;
}

Others are similar. In addition, add Criteria when querying, see https://www.boxuk.com/insight...

Answer 2

@boxsnake This will create a new question

>php bin/console doctrine:schema:update --force


  [Doctrine\DBAL\Schema\SchemaException]
  The table with name 'symfony.votes' already exists.


doctrine:schema:update [--complete] [--dump-sql] [-f|--force] [--em [EM]] [-h|--help] [-q|--quiet] [-v|vv|vvv|--verbose] [-V|--version] [--ansi] [--no-ansi] [-n|--no-interaction] [-e|--env ENV] [--no-debug] [--] <command>