Laravel framework - Detailed introduction to the advanced parts of EloquentORM

<?phpnamespace App;use Illuminate\Database\Eloquent\Model;class User extends Model{

    /**

     * Get the phone record associated with the user.

     */

    public function phone()

    {

        return $this->hasOne('App\Phone');

    }

}

$phone = User::find(1)->phone;

return $this->hasOne('App\Phone', 'foreign_key');return $this->hasOne('App\Phone', 'foreign_key', 'local_key');

<?phpnamespace App;use Illuminate\Database\Eloquent\Model;class Phone extends Model{

    /**

     * Get the user that owns the phone.

     */

    public function user()

    {

        return $this->belongsTo('App\User');        // return $this->belongsTo('App\User', 'foreign_key');

        // return $this->belongsTo('App\User', 'foreign_key', 'other_key');

    }

}

<?phpnamespace App;use Illuminate\Database\Eloquent\Model;class Post extends Model{

    /**

     * Get the comments for the blog post.

     */

    public function comments()

    {

        return $this->hasMany('App\Comment');

    }

}

$comments = App\Post::find(1)->comments;

foreach ($comments as $comment) {    //}

$comments = App\Post::find(1)->comments()->where('title', 'foo')->first();

$comment = App\Comment::find(1);

echo $comment->post->title;

<?phpnamespace App;use Illuminate\Database\Eloquent\Model;class User extends Model{

    /**

     * The roles that belong to the user.

     */

    public function roles()

    {

        // 指定关联表

        // return $this->belongsToMany('App\Role', 'role_user');

        // 指定关联表，关联字段

        // return $this->belongsToMany('App\Role', 'role_user', 'user_id', 'role_id');

        return $this->belongsToMany('App\Role');

    }

}

user = App\User::find(1);

foreach ($user->roles as $role) {    //}$roles = App\User::find(1)->roles()->orderBy('name')->get();

<?phpnamespace App;use Illuminate\Database\Eloquent\Model;class Role extends Model{

    /**

     * The users that belong to the role.

     */

    public function users()

    {

        return $this->belongsToMany('App\User');

    }

}

$user = App\User::find(1);

foreach ($user->roles as $role) {

    echo $role->pivot->created_at;

}

return $this->belongsToMany('App\Role')->withPivot('column1', 'column2');

countries    id - integer

    name - stringusers    id - integer

    country_id - integer

    name - stringposts    id - integer

    user_id - integer

    title - string

namespace App;

use Illuminate\Database\Eloquent\Model;class Country extends Model{    /**

     * Get all of the posts for the country.

     */

    public function posts()

    {        // return $this->hasManyThrough('App\Post', 'App\User', 'country_id', 'user_id');

        return $this->hasManyThrough('App\Post', 'App\User');

    }

}

HasManyThrough hasManyThrough(

    string $related,

    string $through,

    string|null $firstKey = null,

    string|null $secondKey = null,

    string|null $localKey = null)

posts    id - integer

    title - string

    body - textcomments    id - integer

    post_id - integer

    body - textlikes    id - integer

    likeable_id - integer

    likeable_type - string

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;class Like extends Model{    /**

     * Get all of the owning likeable models.

     */

    public function likeable()

    {        return $this->morphTo();

    }

}class Post extends Model{    /**

     * Get all of the product's likes.

     */

    public function likes()

    {        return $this->morphMany('App\Like', 'likeable');

    }

}class Comment extends Model{    /**

     * Get all of the comment's likes.

     */

    public function likes()

    {        return $this->morphMany('App\Like', 'likeable');

    }

}

use Illuminate\Database\Eloquent\Relations\Relation;Relation::morphMap([    'posts' => App\Post::class,

    'likes' => App\Like::class,]);

$post = App\Post::find(1); 

foreach ($post->likes as $like) {    //}

$like = App\Like::find(1);  

$likeable = $like->likeable;

/**

 * Get all of the posts for the user.

 */public function posts()

{   return $this->hasMany('App\Post');

}

$user = App\User::find(1);$user->posts()->where('active', 1)->get();

$user = App\User::find(1);foreach ($user->posts as $post) {    //}

// 检索至少有一个评论的所有帖子...$posts = App\Post::has('comments')->get();

// Retrieve all posts that have three or more comments...$posts = Post::has('comments', '>=', 3)->get();

// Retrieve all posts that have at least one comment with votes...$posts = Post::has('comments.votes')->get();

// 检索所有至少存在一个匹配foo%的评论的帖子$posts = Post::whereHas('comments', function ($query) {   

$query->where('content', 'like', 'foo%');

})->get();

<?phpnamespace App;use Illuminate\Database\Eloquent\Model;class Book extends Model{

    /**

     * Get the author that wrote the book.

     */

    public function author()

    {

        return $this->belongsTo('App\Author');

    }

}

$books = App\Book::all();

foreach ($books as $book) {   

echo $book->author->name;

}

$books = App\Book::with('author')->get();

foreach ($books as $book) {

    echo $book->author->name;

}

select * from books

select * from authors where id in (1, 2, 3, 4, 5, ...)

$books = App\Book::with('author', 'publisher')->get();

$books = App\Book::with('author.contacts')->get();

$users = App\User::with(['posts' => function ($query) {

    $query->where('title', 'like', '%first%');

}])->get();$users = App\User::with(['posts' => function ($query) {

    $query->orderBy('created_at', 'desc');

}])->get();

$books = App\Book::all();if ($someCondition) {    $books->load('author', 'publisher');

}$books->load(['author' => function ($query) {

    $query->orderBy('published_date', 'asc');

}]);

$comment = new App\Comment(['message' => 'A new comment.']);

$post = App\Post::find(1);$post->comments()->save($comment);

$post = App\Post::find(1);

$post->comments()->saveMany([   

new App\Comment(['message' => 'A new comment.']),   

new App\Comment(['message' => 'Another comment.']),

]);

App\User::find(1)->roles()->save($role, ['expires' => $expires]);

$post = App\Post::find(1);$comment = $post->comments()->create([

    'message' => 'A new comment.',]);

$account = App\Account::find(10);

$user->account()->associate($account);

$user->save();

$user->account()->dissociate();$user->save();

$enterprise->with(['favorites' => function($query) {   

$query->wherePivot('enterprise_id', '=', 12)->select('id');

}]);

$user = App\User::find(1);

// 为用户添加角色

$user->roles()->attach($roleId);

// 为用户添加角色，更新中间表的expires字段

$user->roles()->attach($roleId, ['expires' => $expires]);

// 移除用户的单个角色

$user->roles()->detach($roleId);

// 移除用户的所有角色

$user->roles()->detach();

$user = App\User::find(1);

$user->roles()->detach([1, 2, 3]);

$user->roles()->attach([1 => ['expires' => $expires], 2, 3]);

$user = App\User::find(1);$user->roles()->updateExistingPivot($roleId, $attributes);

$user->roles()->sync([1, 2, 3]);

$user->roles()->sync([1 => ['expires' => true], 2, 3]);

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;class Comment extends Model{    /**

     * All of the relationships to be touched.

     *

     * @var array

     */

    protected $touches = ['post'];    /**

     * Get the post that the comment belongs to.

     */

    public function post()

    {        return $this->belongsTo('App\Post');

    }

}

$comment = App\Comment::find(1);$comment->text = 'Edit to this comment!';$comment->save();