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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}

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

1When updating a belongsTo relationship, you may use the associate method. This 
2method will set the foreign key on the child model:
3
4	$account = App\Account::find(10);
5	$user->account()->associate($account);
6	$user->save();
7
8When removing a belongsTo relationship, you may use the dissociate method. This
9method will set the relationship foreign key to null:
10
11	$user->account()->dissociate();
12	$user->save();

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}