php 如何在特定索引号的 Laravel 中将对象（模型类型对象）插入到集合对象中？

How to insert an object (Model type object) into Collection Object in Laravel at specific index number?

提问by Nirmalz Thapaz

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

我已经阅读了 Dayle Rees 的Code Bright，以了解有关CollectionLaravel 中使用的 Eloquent 的更多信息。也做了一些其他研究，但找不到我正在寻找的答案。

I want to insert an object (Modeltype object) into a CollectionObject at a specific position.

我想在特定位置将对象（Model类型对象）插入到Collection对象中。

For example:

例如：

This is the returned collection

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) 

)

As you can see above [present_day]have a values ranging from 1 to 5, but the value, 3is missing in the sequence. Now, what I really want to do is, I want to explicitly put a new Attendance Objectat 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:

正如您在上面看到的，[present_day]值范围为1 to 5，但该值3在序列中缺失。现在，我真正想要做的是，我想明确地Attendance Object在集合对象的[2]索引号/位置的位置放置一个新的，从而通过推送出勤对象的其余部分。我真的很难做到这一点。我如何才能使上面的集合对象看起来像下面这样：

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) 

)

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.

我认为有一些方法可以允许这样做，如果它是数组。由于这是一个Collection，我不知道该怎么做。

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 Collectionobject.

注意：我不想将它转换为数组并在数组中插入。出于某种原因，我想让这个输出严格在Collection对象中。

采纳答案by Matt Burrow

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

要将项目插入到集合中，请参阅此答案；回答

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

基本上，拆分集合，在相关索引处添加项目。

---

---

You can add the item to the Eloquent\Collectionobject with the addmethod;

您可以Eloquent\Collection使用该add方法将项目添加到对象中；

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

or

或者

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

Then you can reorder the collection using the sortBymethod;

然后您可以使用该sortBy方法对集合重新排序；

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

This will reorder the collection by your present_dayattribute.

这将按您的present_day属性对集合重新排序。

---

---

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 addmethod.

请注意，上述代码仅在您使用Illuminate\Database\Eloquent\Collection. 如果您使用的是普通Eloquent\Support\Collection，则没有add方法。

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

相反，您可以使用空数组偏移量，与在普通数组中插入新元素相同：

$collection[] = $item;

This form also works on the Eloquent version of Collection.

这种形式也适用于 Eloquent 版本的Collection.

回答by stevebaros

The put method sets the given key and value in the collection:

put 方法在集合中设置给定的键和值：

$collection = collect(['product_id' => 1, 'name' => 'Desk']);

$collection->put('price', 100);

$collection->all();

// ['product_id' => 1, 'name' => 'Desk', 'price' => 100]