如何使用 Laravel 8 查询生成器，如 eloquent 进行搜索

Question

I'm developing a simple CRM with Laravel 8 that needs to search in query string.

My query string would be look like:

http://127.0.0.1:8000/admin/users/supervisor?q=john&gender=m

Now the problem is how can I search in controller?

I want to do like this:

public function index (Request $request)
{
    $role = getRoleCode($request->role);
    $roles = Role::where('role', '=', $role);

    if ($request->q) {
        $roles->where('name', 'like', "%$request->$q%");
    }

    if ($request->gender) {
        $roles->where('gender', '=', $request->gender);
    }

    $role->orderBy('id', 'desc')->paginate(20);

    return view('admin.users.index', [
        'roles' => $roles,
        'role_name' => config('settings.roles')[$role],
        'role_en_name' => $request->role,
        'q' => $request->q,
        'gender' => $request->gender
    ]);
}

I wonder why its not working and what is the standard way to do this.

I've tried:

Role::query();

but that didn't work either.

I've also tried:

$roles = Role::where('role', '=', $role)
    ->where('name', 'like', "%$request->$q%")
    ->where('gender', '=', $request->gender)
    ->orderBy('id', 'desc')
    ->paginate(20);

This codes works perfectly but we may not be sending the "q" or "gender" URL params.

PS: Sorry for my bad English:)

Answer 1

If you want to conditionally add where statements to your query you can use the if statements like you are attempting to do or use the when method of the Eloquent/Query Builder:

$roles = Role::where('role', $role)
    ->when($request->input('q'), fn ($query, $search) => $query->where('name', 'like', '%'. $search .'%'))
    ->when($request->input('gender'), fn ($query, $gender) => $query->where('gender', $gender))
    ->orderBy('id', 'DESC')
    ->paginate(20);

Laravel 8.x Docs - Queries - Conditional Clauses when

Answer 2

work with when() it's better

->when(true, function($query){$query->where('x', x);})

Answer 3

Your route should be like this:

Route::get('/admin/users/{role}', [YourController::class, 'index']);

Your index function will be like this:

public function index (Request $request,$role)
{
   //old line $role = getRoleCode($request->role);
    $role = getRoleCode($role);
    $roles = Role::where('role', '=', $role);

    if ($request->q) {
        $roles->where('name', 'like', "%$request->$q%");
    }
    if ($request->gender) {
        $roles->where('gender', '=', $request->gender);
    }

    $role->orderBy('id', 'desc')->paginate(20);
    return view('admin.users.index', [
        'roles' => $roles,
        'role_name' => config('settings.roles')[$role],
        'role_en_name' => $request->role,
        'q' => $request->q,
        'gender' => $request->gender
    ]);
}

Answer 4

There is a mistake Mr Mohamed $roles instead of $role

//$roles->orderBy('id', 'desc')->paginate(20)...