How to add and exclude where() clause in laravel query builder - laravel

Question

How to add and exclude where() clause in laravel query builder so that in one case it will be added in other one no
$orders = DB::table('orders')->select(
'orders.id as id',
'orders.created_at as created',
'u.email as email',
'ud.id as data_id',
'ud.firstName as firstName',
'ud.lastName as lastName',
'ud.phone as phone',
's.name as service',
's.id as service_id',
'pt.id as payment_type_id',
'pt.name as payment_name')
->join('users as u', 'orders.user_id', '=', 'u.id')
->join('user_data as ud', 'u.id', '=' ,'ud.user_id')
->join('payment_types as pt', 'orders.payment_type_id', '=', 'pt.id')
->join('services as s', 'orders.service_id', '=', 's.id')
->where('u.id', $user->id)->orderBy($sortBy, $type)->get();
I want to do this
$order = DB::table()....
if(true){
$order->where('id', '=', 1);
}
$order->orderBy('fieldname', 'asc')->get();
But the example above return no results

Answer 1

For conditional clauses you can make use of when().
$order = DB::table()
->yourQuery(...)
->when($var, function ($query, $var) { // <----
return $query->where('id', '=', 1); // <----
} // <----
->orderBy('fieldname', 'asc')
->get();
You can read more about this in the docs:
Conditional Queries
Sometimes you may want clauses to apply to a query only when something
else is true. For instance you may only want to apply a where
statement if a given input value is present on the incoming request.
You may accomplish this using the when method:
$role = $request->input('role');
$users = DB::table('users')
->when($role, function ($query, $role) {
return $query->where('role_id', $role);
})
->get();
The when method only executes the given Closure when the first
parameter is true. If the first parameter is false, the Closure will
not be executed.
...