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 exampleCommentbelongs toPost, sometimes it is useful to update the child model causing the parent model timestamp to be updated. For example, when theCommentmodel is updated, you want to automatically trigger an update of theUpdated_attimestamp of the parentPostmodel.EloquentMake it easy, just add atouchattribute containing the name of the child model relationship.

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 useAuth::once()to authenticate the user for a single request, this method will not useCookieSession. This means that this method may be useful for building statelessAPI.

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

04: Redirect to a controller method with parameters

You can not only use theredirect()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 usewithDefault()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 usingwithDefault().

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

06: In the template, two parallel$loopvariables

are inforeachofblade, Even in two loops, you can still get the parent variable by using the$loopvariable.

@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 theEloqumentquery, you can usemap()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 usedd()

Add$test->dd() at the end ofEloqument, instead ofdd($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 ahasMany()relationship and you want to save many subclass objects from the parent class object, you can usesaveMany()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 inModel::all()

When you useEloqument'sModel::all( ), you can specify the columns to be returned.

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

11:@authin

Blade

You can use the@authdirective instead ofifstatement 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 useMailablesto 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 forhasMany

In thehasMany()relationship ofEloquentyou 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 hastimestamps()timestamps, but alsotimestampsTz()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 inEloquent

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

$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: UsingorderBy() in theEloquentrelationship

You can specify # directly in theEloquentrelationship ##orderBy().

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

20: Unsigned integer

For migrated foreign keys, do not use

integer(), but useunsignedInteger()or It isinteger()->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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