Laravel Checking whether it has data or not from the model

问题

I am receiving the data from url and sending it to the model to and then displaying in the model like this.

public function BlogDisplay($data=NULL)
    {
        $BlogData = BlogModel::where('BlogLink', '=', $data)->get();
        return View::make('Blogs', array('BlogData' => $BlogData));

And then in the view.

But to check whether it has the data or not I am doing that in the view like this:

<?php

   if($BlogData)
   {
     var_dump($BlogData);
     echo 'has data';
   }
   else
   {
     var_dump($BlogData);
     echo 'has no data';
   }
?>

But both of the it shows the array.

How can i check whether it given $data exist or not in the database.

回答1:

You are most likely getting back an Illuminate/Database/Eloquent/Collection object and the truthy check is coming back as true since the object is there. What you can do though is use the isEmpty() method built into that object.

http://laravel.com/api/4.2/Illuminate/Database/Eloquent/Collection.html#method_isEmpty

In your view:

@if ($BlogData->isEmpty())
    Nothing Here
@else 
    Got data!
@endif

来源：https://stackoverflow.com/questions/27660175/laravel-checking-whether-it-has-data-or-not-from-the-model