Php Laravel修改采集数据
我想知道Laravel是否有任何助手来修改集合。我需要做的是使用paginate()进行查询,然后检查登录的用户ID是否与发送者或接收者匹配,并在此基础上向输出添加一个新值:Php Laravel修改采集数据,php,laravel,mutators,Php,Laravel,Mutators,我想知道Laravel是否有任何助手来修改集合。我需要做的是使用paginate()进行查询,然后检查登录的用户ID是否与发送者或接收者匹配,并在此基础上向输出添加一个新值: $userId = Auth::guard('api')->user()->user_id; $allMessages = Conversation::join('users as sender', 'conversations.sender_id', '=', 'sender.user_id')
$userId = Auth::guard('api')->user()->user_id;
$allMessages = Conversation::join('users as sender', 'conversations.sender_id', '=', 'sender.user_id')
->join('users as reciver', 'conversations.recipient_id', '=', 'reciver.user_id')
->where('sender_id',$userId)->orWhere('recipient_id',$userId)
->orderBy('last_updated', 'desc')
->select('subject','sender_id','recipient_id','sender_unread','recipient_unread','last_updated','reciver.username as receivername','sender.username as sendername')
->paginate(20);
现在我想做一些类似的事情:
if ( $allMessages->sender_id == $userId ) {
//add new value to output
newField = $allMessages->sendername
} else {
//add new value to output
newField = $allMessages->receivername
}
然后发送添加了新值的数据
return response()->json(['messages' => $allMessages],200);
这可能吗?通过添加以下内容解决:
foreach ($allMessages as $message) {
if ($message->sender_id == $userId) {
$message->display_name = $message->receivername;
} else {
$message->display_name = $message->sendername;
}
}
为此,最好使用Collection类的内置函数。例如,
map
功能将是完美的
由于我不知道您使用的是哪一个Laravel版本,所以使用Laravel 5.2让我给您一个更智能的方法来处理这个问题(如果我正确地理解了您的问题) 您可以使用Laravel的() 在构建查询时不要使用paginate方法,而应该使用simpleget方法来获取简单集合
$userId = Auth::guard('api')->user()->user_id;
$allMessages = Conversation::join('users as sender', 'conversations.sender_id', '=', 'sender.user_id')
->join('users as reciver', 'conversations.recipient_id', '=', 'reciver.user_id')
->where('sender_id',$userId)->orWhere('recipient_id',$userId)
->orderBy('last_updated', 'desc')
->select('subject','sender_id','recipient_id','sender_unread','recipient_unread','last_updated','reciver.username as receivername','sender.username as sendername')
->get();
$total_count = $allMessages->count();
$limit = 20;
$current_page = request()->get('page');
$options = [
'path' => request()->url(),
'query' => request()->query(),
];
$paginated_collection = new LengthAwarePaginator($allMessages, $total_count, $limit, $current_page, $options);
现在,您可以根据以下特定条件将额外的项填充到该集合中
if ($allMessages->sender_id == $userId ) {
// add new value to collection
} else {
// add new value to collection
}
现在使用LengthAwarePaginator将填充的集合转换为分页集合
$userId = Auth::guard('api')->user()->user_id;
$allMessages = Conversation::join('users as sender', 'conversations.sender_id', '=', 'sender.user_id')
->join('users as reciver', 'conversations.recipient_id', '=', 'reciver.user_id')
->where('sender_id',$userId)->orWhere('recipient_id',$userId)
->orderBy('last_updated', 'desc')
->select('subject','sender_id','recipient_id','sender_unread','recipient_unread','last_updated','reciver.username as receivername','sender.username as sendername')
->get();
$total_count = $allMessages->count();
$limit = 20;
$current_page = request()->get('page');
$options = [
'path' => request()->url(),
'query' => request()->query(),
];
$paginated_collection = new LengthAwarePaginator($allMessages, $total_count, $limit, $current_page, $options);
变量
$paginated_collection
现在可用于发送响应。希望这能帮助您解决您的问题。您当然可以使用laravel的Lengshawarepaginator
除了集合的总计数外,您还需要传递需要在每个页面上显示的集合数据片段
$total_count = $allMessages->count();
$per_page = 2;
$current_page = request()->get('page') ?? 1;
$options = [
'path' => request()->url(),
'query' => request()->query(),
];
假设每页需要2个结果,然后首先计算偏移量
$offset = ($current_page - 1) * $per_page;
现在切片集合以获取每页数据
$per_page_data = $collection->slice($offset, $per_page);
$paginated_data = new LengthAwarePaginator($per_page_data, $total_count, $per_page, $current_page, $options);
$paginated_data
将只包含由$per_page
变量声明的有限数量的项
如果你想要下面的两段数据,然后通过“代码> APIIAdvestage”页面=“2”<代码>作为你的URL。
你也可以考虑通过这个方法。它会更好,因为它不返回一个新的集合实例,但是修改了原来的集合。在构建我的查询时,我不应该使用PAGILATE吗?它不起作用,“总数”:22,“PypPage”。:20,“from”:1,“to”:22,它应该将结果限制为20,但我仍然从result@user2636197paginate()方法返回类型为\illumb\Contracts\Pagination\LengthAwarePaginator的结果,您不能使用某些收集方法来处理结果数据。这就是为什么为了使数据处理更容易,我采用了Laravel收集的形式,而不是LengthAwarePaginator。