laravel 如何删除集合中的重复项？
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How to remove duplicates in collection?
提问by Blablacar
I have collection in Laravel:
我在 Laravel 中有收藏：
Collection {#450 ▼
#items: array:2 [▼
0 => Announcement {#533 ?}
1 => Announcement {#553 ?}
]
}
It is the same items. How ti delete one of them?
这是相同的项目。如何删除其中之一？
Full code is:
完整代码为：
public function announcements()
{
$announcements = $this->categories_ann->map(function ($c) {
return $c->announcements->map(function ($a) {
$a->subsribed = true;
return $a;
});
});
$flattened = $announcements->groupBy("id")->flatten();
return $flattened;
}
回答by Mevlüt?zdemir
$unique = $collection->unique();
回答by Richard
$collection = collect([
['name' => 'iPhone 6', 'brand' => 'Apple', 'type' => 'phone'],
['name' => 'iPhone 5', 'brand' => 'Apple', 'type' => 'phone'],
['name' => 'Apple Watch', 'brand' => 'Apple', 'type' => 'watch'],
['name' => 'Galaxy S6', 'brand' => 'Samsung', 'type' => 'phone'],
['name' => 'Galaxy Gear', 'brand' => 'Samsung', 'type' => 'watch'],
]);
Then let's say you want the brand to be unique, in this case you should only get two brands 'Apple', and 'Samsung'
然后假设您希望品牌独一无二，在这种情况下，您应该只获得“Apple”和“Samsung”两个品牌
$unique = $collection->unique('brand');
$unique->values()->all();
/*
[
['name' => 'iPhone 6', 'brand' => 'Apple', 'type' => 'phone'],
['name' => 'Galaxy S6', 'brand' => 'Samsung', 'type' => 'phone'],
]
*/
This is taken from https://laravel.com/docs/master/collections#method-unique
这取自https://laravel.com/docs/master/collections#method-unique
