laravel belongs to

1use Illuminate\Database\Eloquent\Builder;
2
3// Retrieve posts with at least one comment containing words like foo%...
4$posts = App\Post::whereHas('comments', function (Builder $query) {
5    $query->where('content', 'like', 'foo%');
6})->get();
7
8// Retrieve posts with at least ten comments containing words like foo%...
9$posts = App\Post::whereHas('comments', function (Builder $query) {
10    $query->where('content', 'like', 'foo%');
11}, '>=', 10)->get();

1Event::with(["owner", "participants" => function($q) use($someId){
2    $q->where('participants.IdUser', '=', 1);
3    //$q->where('some other field', $someId);
4}])

1    public function user()
2    {
3        return $this->belongsTo(User::class);
4    }

1For example, a blog post may have an infinite number of comments. And a single
2comment belongs to only a single post  
3
4class Post extends Model
5{
6    public function comments()
7    {
8        return $this->hasMany('App\Models\Comment');
9    }
10}
11
12class Comment extends Model
13{
14    public function post()
15    {
16        return $this->belongsTo('App\Models\Post');
17    }
18}

1<?php
2
3namespace App\Models;
4
5use Illuminate\Database\Eloquent\Model;
6
7class Phone extends Model
8{
9    /**
10     * Get the user that owns the phone.
11     */
12    public function user()
13    {
14        return $this->belongsTo('App\Models\User');
15    }
16}

1<?php
2
3namespace App\Models;
4
5use Illuminate\Database\Eloquent\Model;
6
7class Post extends Model
8{
9    /**
10     * Get the comments for the blog post.
11     */
12    public function comments()
13    {
14        return $this->hasMany('App\Models\Comment');
15    }
16}