By eager loading the nested relationship, we reduce the total number of queries from 11 to 3. 7. Do not load belongsTo relationship if you just need its id Imagine you have two tablespostsandauthors. Posts table has a columnauthor_idwhich represents a belongsTo relationship on the authors ...
You may use "dot" notation to execute a query against a nested relationship. For example, the following query will retrieve all posts that do not have comments; however, posts that have comments from authors that are not banned will be included in the results:use Illuminate\Database\Eloquent...
Nested has statements may also be constructed using "dot" notation. For example, you may retrieve all posts that have at least one comment and vote:1// Retrieve all posts that have at least one comment with votes... 2$posts = App\Post::has('comments.votes')->get();...
1$books = Book::with('author', 'publisher')->get();You may even eager load nested relationships:1$books = Book::with('author.contacts')->get();In the example above, the author relationship will be eager loaded, and the author's contacts relation will also be loaded....
$results = $this->addNestedWiths($name, $results); $results[$name] = $constraints; } return $results; } public function get($columns = ['*']) { $builder = $this->applyScopes(); //获取模型时会去加载要预加载的关联模型 if (count($models = $builder->getModels($columns)) > 0) ...
This portion of the documentation only discusses non-relationship fields. To learn more about relationship fields, check out their documentation.Nova ships with a variety of field types. So, let’s explore all of the available types and their options:...
// Laravel pluck an array from nested relationship Eloquent 9 559 Level 2 Kareimovich OP Posted 6 years ago I need to get pathtags and add it to a variable so I can replace it with ['XML','PHP','CSS3'].$Paths= Path::with(['ProgrammingField','pathtags' => function ($q) {$q...
When using a custom keyed implicit binding as a nested route parameter, Laravel will automatically scope the query to retrieve the nested model by its parent using conventions to guess the relationship name on the parent. However, this behavior was only previously supported by Laravel when a custo...
The nested set model is to number the nodes according to a tree traversal, which visits each node twice, assigning numbers in the order of visiting, and at both visits. This leaves two numbers for each node, which are stored as two attributes. Querying becomes inexpensive: hierarchy membership...
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