Laravel：如何在控制器的几种方法中重用代码片段

Question

I am building a form in order to both create and edit records.

Since I am using a lot of relational information (tables) from several catalogs and shown in the for as a select box (Select2), I need to retrieve all the data to be shown in those HTML select tags.

So, let's say that in my controller in the create() method, I call that info like so:

create() method of MyController.php:

public function create(Token $token){
    //Tags
    $universities      = University::orderBy('name')->get();
    $countries         = Country::orderBy('name')->get();
    $programs      = Program::orderBy('name')->get();
    //... and many more

    return view('my.form.create',[
        'universities' =>  $universities,
        'countries'    =>  $countries,
        'programs'     =>  $programs,
        'token'        =>  $token
    ]);
}

How do I do to reuse that piece of code //Tags

//Tags
$universities      = University::orderBy('name')->get();
$countries         = Country::orderBy('name')->get();
$programs      = Program::orderBy('name')->get();
//... and many more

in order to reuse it for the, let's say, edit() method or other ones??

Answer 1

You could put them in a separate method in your class that just returns the data as an array and then call that method from your create and edit methods:

protected function getFormData()
{
    return [
        'universities' => University::orderBy('name')->get(),
        'countries'    => Country::orderBy('name')->get(),
        'programs'     => Program::orderBy('name')->get(),
    ];
}

Then your create and edit methods would look something like:

public function create(Token $token)
{
    $data = $this->getFormData();

    return view('my.form.create', $data);
}

public function edit(Token $token)
{
    $data = $this->getFormData();

    return view('my.form.edit', $data);
}

If you're not planning on adding anything to the data array then you could simply inline the call instead:

return view('my.form.edit', $this->getFormData());