Laravel store data auto increment - php

Question

class PostController extends Controller{
public $grupID = 1;
public function store(Request $request)
{
$post = new Post();
$post->GroupID = 'POST-' . $this->grupID;
$post->save();
return response()->json($post);
$this->grupID++;
}
}
Database Structur
public function up()
{
Schema::create('posts', function (Blueprint $table) {
$table->increments('id');
$table->integer('PostTypeID');
$table->string('GroupID', 100)->nullable();
$table->timestamps();
});
}
I want to make the groupID auto increment, but it always return 'POST-1'.

Answer 1

Try this one, you need to get the last value in your DB,
class PostController extends Controller{
public function store(Request $request)
{
$lastValue = DB::table('posts')->orderBy('GroupID', 'desc')->first();
$post = new Post();
$post->GroupID = 'POST-' . $lastValue->GroupID + 1 ;
$post->save();
return response()->json($post);
}
}
Hope this help :)

Answer 2

in your database migration file
$table->increments('grupID');
and it's automatically increment.

Answer 3

class PostController extends Controller{
public function store(Request $request)
{
$last = DB::table('posts')->last();
$post = new Post();
if ($last) {
$part = explode('-', $last->GroupID);
$post->GroupID = $part[0] . '-' . ($part[1] + 1);
} else {
$post->GroupID = 'POST-1';
}
$post->save();
return response()->json($post);
}
}

Answer 4

When you use a return statement, the execution stops, so your increment never happens. Put the return statement at the end.

Answer 5

class PostController extends Controller{
public function store(Request $request)
{
$groupID = Post::pluck('GroupID')->last();
$post = new Post();
$post->GroupID = 'POST-' . $groupID + 1;
$post->save();
return response()->json($post);
}
}
$groupID = Post::pluck('GroupID')->last();
This gives you the last groupID from the column table (ordered asc by ID).
$post->GroupID = 'POST-' . $groupID + 1;
This increment the value before saving it in the table.