laravel 向 Eloquent Collection 添加新属性
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Adding new property to Eloquent Collection
提问by MASh
Trying to add new property to existing collection and access that.
尝试向现有集合添加新属性并访问它。
What I need is something like:
我需要的是这样的：
$text = Text::find(1); //Text model has properties- id,title,body,timestamps
$text->user = $user;
And access the user via, $text->user.
并通过，访问用户$text->user。
Exploring on documentation and SO, I found put, prepend, setAttributemethods to do that.
探索对文档和SO，我发现put，prepend，setAttribute的方法来做到这一点。
$collection = collect();
$collection->put('a',1);
$collection->put('c',2);
echo $collection->c; //Error: Undefined property: Illuminate\Support\Collection::$c
Again,
再次，
$collection = collect();
$collection->prepend(1,'t');
echo $collection->t = 5; //Error: Undefined property: Illuminate\Support\Collection::$t
And
和
$collection = collect();
$collection->setAttribute('c',99); // Error: undefined method setAttribute
echo $collection->c;
Any help?
有什么帮助吗？
采纳答案by Marcin Nabia?ek
I think you mix here Eloquent collection with Support collection. Also notice when you are using:
我认为您将 Eloquent 集合与 Support 集合混合在一起。使用时还要注意：
$text = Text::find(1); //Text model has properties- id,title,body,timestamps
$text->user = $user;
you don't have here any collection but only single object.
您在这里没有任何集合，而只有单个对象。
But let's look at:
但让我们看看：
$collection = collect();
$collection->put('a',1);
echo $collection->c; //Error: Undefined property: Illuminate\Support\Collection::$c
You are taking cand you don't have such element. What you should do is taking element that is at akey like this:
你正在服用c而你没有这样的元素。你应该做的是a像这样获取关键的元素：
echo $collection->get('a');
or alternatively using array access like this:
或者像这样使用数组访问：
echo $collection['a'];
Also notice there is no setAttributemethod on Collection. There is setAttributemethod on Eloquent model.
还要注意setAttributeCollection 上没有方法。setAttributeEloquent 模型上有方法。
