laravel列表给列值赋予错误的ID(laravel lists is giving wrong ids for the column values)

laravel列表给列值赋予错误的ID(laravel lists is giving wrong ids for the column values)

我正在拿一份名单

$rostersList = Roster::where('school_id', $this->schoolId)->get()->lists('id', 'name'); $rostersList->prepend('Select Roster');

但ID总是从0,1,2开始，为什么？ 但是根据where条件，返回的列表不应该从0或1开始，而是从4开始。这里可能出现什么问题？

I am fetching a list of rosters

$rostersList = Roster::where('school_id', $this->schoolId)->get()->lists('id', 'name'); $rostersList->prepend('Select Roster');

but the ids always start from 0,1,2 why is that? However according to the where condition the returned list should not be starting from 0 or 1 but from 4. What can be the possible issue here?

最满意答案

当您预先设定一个值而没有为其分配密钥时，该集合会被重新键入。

Laravel prepend允许您传递第二个参数作为密钥。

所以你会想要像这样的东西：

$rostersList->prepend('Select Roster', '');

When you prepend a single value without assigning a key with it, the collection gets re-keyed.

Laravel prepend lets you pass a second parameter to use as the key.

So you would want something like:

$rostersList->prepend('Select Roster', '');