Laravel 5 framework learning date, Mutator and Scope, laravelmutator

Laravel 5 framework learning date, Mutator and Scope, laravelmutator

In our previous solution, assigning the value of published_at to the current date is actually a temporary solution. We need to set the release date, which may be released in the next two days, let's modify this question.

First, modify the controller:

  public function store() {    Article::create(Request::all());    return redirect('articles');  }

Modify the view and add the release date field.

@ Extends ('layout ') @ section ('content ') 
OK. Let's add a new article and set the date to one day in the future, but the article is directly displayed at the beginning, which is not what we need. We need to display it that day. Of course, we need to be more specific, for example, display at, instead. We can add a mutator (that is, the property setter of other languages) and modify our model.
<? Php namespace App; use DateTime; use Illuminate \ Database \ Eloquent \ Model; class Article extends Model {protected $ fillable = ['title', 'body ', 'hhed _ at']; // set attributes to comply with the format conventions // set Attribute public function setPublishedAtAttribute ($ date) {$ this-> attributes ['hhed _ at'] = Carbon: createFromFormat ('Y-m-d', $ date)-> hour (8) -> minute (0)-> second (0 );}}
Add a new record and view the database. We have set the time correctly, but our homepage still displays the articles published only in the future, and we modify it.
 public function index() {    //$articles = Article::latest('published_at')->get();    $articles = Article::latest('published_at')->where('published_at', '<=', Carbon::now())->get();    return view('articles.index', compact('articles'));  }
The preceding solution can work, but the query statement is too long. We can use the scope provided by Laravel to simplify our work. The so-called scope can be understood as the intermediate query results used in the query process. For example, if we define a published scope, it can return all the currently published articles and let us modify the model.
// Set scope and follow the naming rules public function scopePublished ($ query) {$ query-> where ('hhed _ at', '<=', Carbon :: now ());}
Modify controller to use scope
 public function index() {    //$articles = Article::latest('published_at')->get();    //$articles = Article::latest('published_at')->where('published_at', '<=', Carbon::now())->get();    $articles = Article::latest('published_at')->published()->get();    return view('articles.index', compact('articles'));  }
The results are the same, but in complex queries, we can use scope to break down our tasks, or reuse the query.
Let's add a new query to query all the articles that have not been published. Add scope to the model
  public function scopeUnpublished($query) {    $query->where('published_at', '>', Carbon::now());  }
Modify the Controller to use unpulished
 public function index() {    //$articles = Article::latest('published_at')->get();    //$articles = Article::latest('published_at')->where('published_at', '<=', Carbon::now())->get();    //$articles = Article::latest('published_at')->published()->get();    $articles = Article::latest('published_at')->Unpublished()->get();    return view('articles.index', compact('articles'));  }
One more thing! If we use dd ($ article-> published_at) in the show method to view the result, it is different from dd ($ article-> created_at). The former is our own field, the latter is automatically generated in CreateArticleTable through $ table-> timestamp. The automatically generated field is displayed as the Carbon type, while the string type is used. There are many benefits to using the Crabon type. For example, you can output dd ($ article-> created_at-> diffForHumans ();. This 1 hour ago result is not supported, but our published_at cannot. How to modify it? Modify the model and tell laravel that published_at is a date.
  protected $dates = ['published_at'];
Use dd ($ article-> published_at-> diffForHumans () again. The result is 3 days from now, Bingo!
The above is all the content of this article. I hope to help you learn about the Laravel5 framework.