Laravel5 basics (11)-Eloquent relationship

: This article mainly introduces Laravel5 basics (11)-Eloquent relationships. For more information about PHP tutorials, see. A user may have multiple articles. one article is written by a user. this is the relationship. The same article may contain multiple tags, and one TAG may be associated with multiple articles.

In the project, we already haveUser.php, That is, the user model. it is quite simple. We want to directly use$user->articles()To get all the articles, let's modify the user model:

    public function articles() {        return $this->hasMany('App\Article');    }

But we only completed one end of the link. let's deal with the other end. The expected form is$article->user(), Let's modify the article model.

    public function user() {        return $this->belongsTo('App\User');    }

In our database, the document model does not have a user's foreign key, so we need to set, modifycreate_article_table.php

Schema: create ('articles', function (Blueprint $ table) {$ table-> increments ('id '); // specify the foreign key column $ table-> integer ('User _ id')-> unsigned (); $ table-> string ('title '); $ table-> text ('body'); $ table-> timestamp ('hhed _ at'); $ table-> timestamps (); // Generate a foreign key $ table-> foreign ('User _ id')-> references ('id')-> on ('users ') -> onDelete ('cascade ');});

Because we are only in the development stage and haven't been online yet, we can directly modify the database migration file, roll back and migrate it. but if it is online, we should create a new migration.

Php artisan migrate: refresh # Rolled back: rollback back: Failed to rollback. Migrated: 2014_10_12_000000_create_users_tableMigrated: Pushed

Now let's usetinkerCreate a user.

Php artisan tinkerPsy Shell v0.4.1 (PHP 5.4.16-cli) by Justin Hileman # The following is the execution process >>>$ user = new App \ User; >{}>>>$ user-> name = 'Zhang Jinglin'; => "zhang jinglin" >>>$ user-> email = 'zjl @ example.com '; => "zjl@example.com" >>>$ user-> password = bcrypt ('pass'); => "$ 2y $10 $ Nbl2b9wqd. rxqkesd3prsooiyfafihb%71bufwdfs3guv21slex2 ">>>$ user-> save () ;=> true >>> App \ User: first ()-> toArray (); => ["id" => "1", "name" => "zhang jinglin", "email" => "zjl@example.com ", "created_at" => "03:24:55", "updated_at" => "03:24:55"]>

Now we need to associate the newly published article with the user. now we need to modifyform_partial.blade.phpTo hide a user ID, but temporarily:

{-- Temporary processing --}}{!! Form: hidden ('User _ id', 1 )!!}

The$fillabelAttribute to facilitate our Mass Assisment.

Protected $ fillable = ['title', 'body', 'hhed _ at', 'User _ id' // temporary settings];

OK. add an article. We usetinkerTo view.

Php artisan tinkerPsy Shell v0.4.1 (PHP 5.4.16-cli) by Justin Hileman >>> App \ Article: first ()-> toArray (); => ["id" => "1", "user_id" => "1", "title" => "User 1 Article ", "body" => "User 1 Body", "published_at" => "08:00:00", "created_at" => "04:17:58 ", "updated_at" => "04:17:58", "excerpt" => null] # get a user >>>$ User = App \ user: first () ;=>{ id: "1", name: "zhang jing Lin ", email:" zjl@example.com ", created_at:" 03:24:55 ", updated_at:" 03:24:55 "} # get user articles >>>> $ user-> articles () -> toArray (); BadMethodCallException with message 'Call to undefined method Illuminate \ Database \ Query \ Builder: toArray () '>>>> $ user-> articles-> toArray () ;=> [["id" => "1", "user_id" => "1 ", "title" => "User 1 Article", "body" => "User 1 Body", "published_at" => "2015-03-3 1 08:00:00 "," created_at "=>" 04:17:58 "," updated_at "=>" 04:17:58 ", "excerpt" => null] # Why use $ user-> articles instead of # user-> articles ()? # In fact, $ user-> articles () returns a link. if you want to use articles (), you need to use >>>$ user-> articles ()-> get () -> toArray (); => [["id" => "1", "user_id" => "1", "title" => "User 1 Article ", "body" => "User 1 Body", "published_at" => "08:00:00", "created_at" => "04:17:58 ", "updated_at" => "04:17:58", "excerpt" => null] # you can only use articles () for the next step, for example, the following query $ user-> articles ()-> where ('title', 'user 1 article')-> get (); # You can also get user >>$ article = App \ article: first () ;=>{ id: "1", user_id: "1", title: "User 1 Article", body: "User 1 Body", published_at: "08:00:00", created_at: "04:17:58", updated_at: "04:17:58", excerpt: null >>>>$ article-> user ;=>{ id: "1", name: "zhang jinglin", email: "zjl@example.com", created_at: "03:24:55 ", updated_at: "03:24:55" >>>

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