如何在特定索引号的Laravel中将对象(模型类型对象)插入Collection对象? [英] How to insert an object (Model type object) into Collection Object in Laravel at specific index number?

问题描述

我已阅读Dayle Rees的 Code Bright ，以了解有关Laravel中使用的雄辩的Collection的更多信息.也进行了其他一些研究，但找不到我想要的答案.

I have read Dayle Rees's Code Bright to know more about Eloquent Collections used in Laravel. Did some other research as well but couldn't find the answer I was looking for.

我想在特定位置的Collection对象中插入一个对象(Model类型的对象).

I want to insert an object (Model type object) into a Collection Object at a specific position.

例如:

这是返回的集合

Illuminate\Database\Eloquent\Collection Object
(
    [0] => Attendance Object
        ([present_day] => 1)

    [1] => Attendance Object
        ([present_day] => 2)

    [2] => Attendance Object
        ([present_day] => 4) 

    [3] => Attendance Object
        ([present_day] => 5) 

)

如上所示，

[present_day]的值范围为1 to 5，但是序列中缺少值3.现在，我真正想做的是，我想在集合对象的[2]索引编号/位置的位置上显式放置一个新的Attendance Object，从而推动其余的出勤对象.我真的很努力做到这一点.我该怎么做才能使上面的集合对象看起来像下面这样:

As you can see above [present_day] have a values ranging from 1 to 5, but the value, 3 is missing in the sequence. Now, what I really want to do is, I want to explicitly put a new Attendance Object at the Collection Object's position of [2] index number/position, thus by pushing the rest of the Attendance Object. I am really struggling to do this right. How can I do this to make above collection object to look like something as below:

Illuminate\Database\Eloquent\Collection Object
(
    [0] => Attendance Object
        ([present_day] => 1)

    [1] => Attendance Object
        ([present_day] => 2)

    [2] => Attendance Object    // This is where new object was added.
        ([present_day] => 3) 

    [4] => Attendance Object
        ([present_day] => 4) 

    [5] => Attendance Object
        ([present_day] => 5) 

)

我认为，如果它是数组，则有一些方法可以完全做到这一点.由于这是Collection，所以我不确定该怎么做.

I think there is some methods that will allow to do exactly like this if it was array. Since this is a Collection, I am not sure how to do it.

注意:我不想将其转换为数组并在数组中进行插入.出于某种原因，我希望将此输出严格地放在Collection对象中.

Note: I don't want to convert it this to array and do the insertion within array. For some reason, I want to have this output strictly in Collection object.

推荐答案

要将项目插入集合中，请参考此答案； 答案

To insert an item into a collection,refer to this answer; Answer

基本上，拆分集合，然后在相关索引处添加项目.

Basically, splits the collection, adds the item at the relevant index.

您可以使用add方法将该项目添加到Eloquent\Collection对象中；

You can add the item to the Eloquent\Collection object with the add method;

$collection->add($item);  // Laravel 4

或

$collection->push($item); // Laravel 5 

然后，您可以使用sortBy方法对集合进行重新排序；

Then you can reorder the collection using the sortBy method;

$collection = $collection->sortBy(function($model){ return $model->present_day; });

这将通过您的present_day属性对集合进行重新排序.

This will reorder the collection by your present_day attribute.

请注意，以上代码仅在使用Illuminate\Database\Eloquent\Collection时有效.如果您使用的是普通Eloquent\Support\Collection，则没有add方法.

Note that the above code will only work if you are using Illuminate\Database\Eloquent\Collection. If you are using a plain Eloquent\Support\Collection, there is no add method.

相反，您可以使用空数组偏移量，就像在普通数组中插入新元素一样:

Instead, you can use an empty array offset, the same as inserting a new element in a normal array:

$collection[] = $item;

此表格也适用于Collection的口才版本.

This form also works on the Eloquent version of Collection.

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