Some tips when using Laravel

01: Trigger the timestamp of the parent

As the title indicates, when the child model is updated, the timestamp of the parent model can be triggered. For example Comment belongs to Post, sometimes it is useful to update the child model causing the parent model timestamp to be updated. For example, when the Comment model is updated, you want to automatically trigger an update of the Updated_at timestamp of the parent Post model. Eloquent Make it easy, just add a touch attribute containing the name of the child model relationship.

<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Comment extends Model
{
    /**
     * 涉及到的所有关联关系。
     *
     * @var array
     */
    protected $touches = [&#39;post&#39;];
    /**
     * 获取评论所属的文章。
     */
    public function post()
    {
        return $this->belongsTo('App\Post');
    }
}

02: Preloading exact columns

When using preloading, you can get the specified columns from the relationship.

$users = App\Book::with('author:id,name')->get();

03: Authenticate the user for a single request

You can use Auth::once() to authenticate the user for a single request, this method will not use Cookie Session. This means that this method may be useful for building stateless API.

if (Auth::once($credentials)) {
    //
}

04: Redirect to a controller method with parameters

You can not only use the redirect() method with user-specific URLs or routes, It can also be used in methods with parameters in the controller.

return redirect()->action('SomeController@method', ['param' => $value]);

05: How to use withDefault() to avoid errors in relationships

When a relationship is called, a fatal error occurs if it does not exist Errors, such as $post->user->name, can be avoided using withDefault().

/** 获取文章作者 */ 
public function user() 
{     
    return $this->belongsTo('App\User')->withDefault(); 
}

06: In the template, two parallel $loop variables

are in foreach of blade, Even in two loops, you can still get the parent variable by using the $loop variable.

@foreach ($users as $user)     
    @foreach ($user->posts as $post)         
        @if ($loop->parent->first)             
            This is first iteration of the parent loop.         
        @endif     
    @endforeach 
@endforeach

07: Modify query results

After executing the Eloqument query, you can use map() to modify the rows.

$users = User::where('role_id', 1)->get()->map(function (User $user) {
    $user->some_column = some_function($user);
    return $user;
});

08: Easily use dd()

Add $test->dd() at the end of Eloqument , instead of dd($result).

// 优化前
$users = User::where('name', 'Taylor')->get();
dd($users);
// 优化后
$users = User::where('name', 'Taylor')->get()->dd();

09: Use hasMany to saveMany.

If there is a hasMany() relationship and you want to save many subclass objects from the parent class object, you can use saveMany() to achieve the effect you want.

$post = Post::find(1);
$post->comments()->saveMany([
    new Comment(['message' => 'First comment']),
    new Comment(['message' => 'Second comment']),
]);

10: Specifying columns in Model::all()

When you use Eloqument's Model::all( ), you can specify the columns to be returned.

$users = User::all(['id', 'name', 'email']);

11: @auth in

You can use the @auth directive instead of if statement to check if the user is authenticated.

Typical method:

@if(auth()->user())     // The user is authenticated. @endif

Short method:

@auth    
 // The user is authenticated. 
@endauth

12: Preview email without sending

If you use Mailables to send your emails, you can preview them without sending them.

Route::get('/mailable', function () {
    $invoice = App\Invoice::find(1);
    return new App\Mail\InvoicePaid($invoice);
});

13: Specific check for hasMany

In the hasMany() relationship of Eloquent you can filter out Records with n number of sub-records.

// Author -> hasMany(Book::class) 
$authors = Author::has('books', '>', 5)->get();

14: Restore multiple soft deletions

If the records use soft deletion, then you can restore multiple soft deleted records at one time.

Post::withTrashed()->where('author_id', 1)->restore();

15: Migration column with time zone

The migration file not only has timestamps() timestamps, but also timestampsTz() with time zone timestamp.

Schema::create('employees', function (Blueprint $table) {
    $table->increments('id');
    $table->string('name');
    $table->string('email');
    $table->timestampsTz();
});

16: Does the view file exist?

Did you know you can also check if a view file exists?

if (view()->exists('custom.page')) {
    // Load the view
}

17: Routing groups in groups

In the routing file, you can create a group for a routing group and specify specific middleware for it.

Route::group(['prefix' => 'account', 'as' => 'account.'], function() {
    Route::get('login', 'AccountController@login');     
    Route::get('register', 'AccountController@register');
    Route::group(['middleware' => 'auth'], function() {         
        Route::get('edit', 'AccountController@edit');     
    });
});

18: Date and time methods in Eloquent

whereDay() , whereMonth() , whereYear() , whereDate() , whereTime() These methods are all methods for checking dates in Eloquent.

$products = Product::whereDate('created_at', '2018-01-31')->get(); 
$products = Product::whereMonth('created_at', '12')->get(); 
$products = Product::whereDay('created_at', '31')->get(); 
$products = Product::whereYear('created_at', date('Y'))->get(); 
$products = Product::whereTime('created_at', '=', '14:13:58')->get();

19: Using orderBy() in the Eloquent relationship

You can specify # directly in the Eloquent relationship ##orderBy() .

public function products()
{
    return $this->hasMany(Product::class);
}
public function productsByName()
{
    return $this->hasMany(Product::class)->orderBy('name');
}

integer(), but use unsignedInteger() or It is integer()->unsigned(), otherwise a series of errors will occur.

Schema::create('employees', function (Blueprint $table) {     
    $table->unsignedInteger('company_id');     
    $table->foreign('company_id')->references('id')->on('companies');     
});

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