zoukankan      html  css  js  c++  java
  • Laravel Many to Many Polymorphic Relationship

    Many to many Polymorphic relationship is also a little bit complicated to understand. For example, if you have posts, videos, and tag tables, you require to connect with each other with your requirement like every post have multiple tags and same for videos too. Also every tag many are connected with multiple post or multiple videos too. But we can easily do it using just one table "taggables". Just read the article and you got it.

    In this article, you can understand how to create polymorphic many-to-many relationships with migration with a foreign key schema for one to many relationships, use sync with a pivot table, create records, attach records, get all records, delete, update, where condition and everything related to many to many polymorphic relationship.

    In this example, i will create "posts", "videos", "tags" and "taggables" tables. each table is connected with each other. now we will create many to many polymorphic relationships with each other by using laravel Eloquent Model. We will first create database migration, then model, retrieve records and then how to create records too. So you can also see database table structure on below screen.

    Polymorphic Many to Many Relationship will use "morphToMany()" and "morphedByMany()" for relation.

    Create Migrations:

    Now we have to create migration of "posts", "videos", "tags" and "taggables" table. so let's create like as below:

    posts table migration:

    Schema::create('posts', function (Blueprint $table) {

    $table->increments('id');

    $table->string("name");

    $table->timestamps();

    });

    videos table migration:

    Schema::create('videos', function (Blueprint $table) {

    $table->increments('id');

    $table->string("name");

    $table->timestamps();

    });

    tags table migration:

    Schema::create('tags', function (Blueprint $table) {

    $table->increments('id');

    $table->string("name");

    $table->timestamps();

    });

    taggables table migration:

    Schema::create('taggables', function (Blueprint $table) {

    $table->integer("tag_id");

    $table->integer("taggable_id");

    $table->string("taggable_type");

    });

    Create Models:

    Here, we will create Post, Video and Tag table model. we will also use "morphToMany()" and "morphedByMany()" for relationship of both model.

    Post Model:

    <?php

    namespace App;

    use IlluminateDatabaseEloquentModel;

    class Post extends Model

    {

    /**

    * Get all of the tags for the post.

    */

    public function tags()

    {

    return $this->morphToMany(Tag::class, 'taggable');

    }

    }

    Video Model:

    <?php

    namespace App;

    use IlluminateDatabaseEloquentModel;

    class Video extends Model

    {

    /**

    * Get all of the tags for the post.

    */

    public function tags()

    {

    return $this->morphToMany(Tag::class, 'taggable');

    }

    }

    Tag Model:

    <?php

    namespace App;

    use IlluminateDatabaseEloquentModel;

    class Tag extends Model

    {

    /**

    * Get all of the posts that are assigned this tag.

    */

    public function posts()

    {

    return $this->morphedByMany(Post::class, 'taggable');

    }

    /**

    * Get all of the videos that are assigned this tag.

    */

    public function videos()

    {

    return $this->morphedByMany(Video::class, 'taggable');

    }

    }

    Retrieve Records:

    $post = Post::find(1);

    dd($post->tags);

    $video = Video::find(1);

    dd($video->tags);

    $tag = Tag::find(1);

    dd($tag->posts);

    $tag = Tag::find(1);

    dd($tag->videos);

    Create Records:

    $post = Post::find(1);

    $tag = new Tag;

    $tag->name = "ItSolutionStuff.com";

    $post->tags()->save($tag);

    $video = Video::find(1);

    $tag = new Tag;

    $tag->name = "ItSolutionStuff.com";

    $video->tags()->save($tag);

    $post = Post::find(1);

    $tag1 = new Tag;

    $tag1->name = "ItSolutionStuff.com";

    $tag2 = new Tag;

    $tag2->name = "ItSolutionStuff.com 2";

    $post->tags()->saveMany([$tag1, $tag2]);

    $video = Video::find(1);

    $tag1 = new Tag;

    $tag1->name = "ItSolutionStuff.com";

    $tag2 = new Tag;

    $tag2->name = "ItSolutionStuff.com 2";

    $video->tags()->saveMany([$tag1, $tag2]);

    $post = Post::find(1);

    $tag1 = Tag::find(3);

    $tag2 = Tag::find(4);

    $post->tags()->attach([$tag1->id, $tag2->id]);

    $video = Video::find(1);

    $tag1 = Tag::find(3);

    $tag2 = Tag::find(4);

    $video->tags()->attach([$tag1->id, $tag2->id]);

    $post = Post::find(1);

    $tag1 = Tag::find(3);

    $tag2 = Tag::find(4);

    $post->tags()->sync([$tag1->id, $tag2->id]);

    $video = Video::find(1);

    $tag1 = Tag::find(3);

    $tag2 = Tag::find(4);

    $video->tags()->sync([$tag1->id, $tag2->id]);

    I hope you understand of many to many relationship...

  • 相关阅读:
    【08月20日】A股滚动市净率PB历史新低排名
    沪深300指数的跟踪基金最近1年收益排名
    基金前15大重仓股持仓股排名
    中证500指数的跟踪基金最近1年收益排名
    【08月14日】A股ROE最高排名
    【08月13日】预分红股息率最高排名
    【08月09日】北上资金持股比例排名
    最近一月研报推荐次数最多的最热股票
    JDK源码阅读-------自学笔记(二十一)(java.util.ArrayList详细版集合类)
    MyBatis-Plus 3.0.3 Sql注入器添加,即全局配置Sql注入器,sqlInjector改写
  • 原文地址:https://www.cnblogs.com/mouseleo/p/10080293.html
Copyright © 2011-2022 走看看