Laravel - Creating a Dynamic URL using a Database String - php

Question

I am with a bit of a stuggle here. I managed to create the dynamic URL using the following code:
Home Page Controller
$satellites = DB::table('satellites')->get();
return view('pages/home', ['satellites' => $satellites]);
Blade File
#foreach($satellites as $satellite)
<li>{{$satellite->satname}}</li>
#endforeach
web.php
Route::get('{norad_cat_id}', 'Satellite#show');
Controller
public function show($norad_cat_id)
{
return view('pages/satellite');
}
The URL generated is: mysite.com/12345 (where 12345 is the norad_cat_id).
This code manages to create the dynamic URLs using the norad_cat_id from the database - which is what I want. The problem is that I can replace the URL with anything and it still creates a page (ie. replace the 12345 with something not from the database and a page is still created).
What I want is only for a URL to be generated only with the norad_cat_id and if there is no matching norad_cat_id in the database, display a 404 page.

Answer 1

In the show method add a fetch from database if there is no record just abort
public function show($norad_cat_id)
{
$satellite = DB::table('satellites')->where('norad_cat_id', $norad_cat_id)->first();
if( ! satellite){
return abort(404);
}
return view('pages/satellite');
}
PS: abort will automatically redirect to your resources/views/errors/404.blade.php

Answer 2

You can do this multiple ways
Create a regex for norad_cat_id
The example shows nummeric ([0-9]+)
Route::get('{norad_cat_id}', 'Satellite#show')->where(['norad_cat_id' => '[0-9]+']);
Use findOrFail() and on fail show the 404.
try
{
$user = Satellites::findOrFail($id);
return view('norad_cats');
}
// catch(Exception $e) catch any exception
catch(ModelNotFoundException $e)
{
return view('404');
}

Answer 3

You can throw 404 in your controlller (for example). Just check if records exists in database - if not then return error.
Example:
public function show($cat_id)
{
$sattelites = DB::table('sattelites')->where('norad_cat_id', $cat_id)->get();
if ($satellites === NULL)
{
\App::abort(404);
}
return view('pages/sattelite', [
'satellites' => $satellites
]);
}
I think you get the idea.

Answer 4

Here's an example using query builder which is what I assume you're using:
public function show($norad_cat_id)
{
$norad_cat_data = DB::table('satellites')->where('norad_cat_id', $norad_cat_id)->get();
if (!is_null($norad_cat_id)
{
return view('pages/satellite');
}
\App::abort(404);
}