how to convert query builder

@tykus before that, i make query like this in controller. But, i think i doesn't work

 public function index(ResearchGroup $researchGroup)
    {
        $researchGroup = ResearchGroupStatus::where(array('and', 'research_group_id=1', array('status=basic')));

        return view('client.landing-page', [          
            'researchGroupStatuses' => $researchGroup,
        ]);
    }

@mhmmdva what is that query intended to do; it is not valid!?!?

 public function index(ResearchGroup $researchGroup)
    {
        $researchGroupStatuses = $researchGroup->researchGroupStatuses()
            ->where('status', 'basic')
            ->get();

        return view('client.landing-page', [          
            'researchGroupStatuses' => $researchGroupStatuses,
        ]);
    }

@tykus I just want to take research_group_id = 1 and the status is basic, because I follow this link : https://www.yiiframework.com/doc/guide/1.1/id/database.query-builder

@mhmmdva yes, and if you want to use Eloquent, then either of the queries I gave you will work:

// Because you already have the `ResearchGroup` instance from Route-Model Binding
$researchGroupStatuses = $researchGroup->researchGroupStatuses()
            ->where('status', 'basic')
            ->get();

// If you don't have the correct ResearchGroup instance for some reason
$researchGroupStatuses = ResearchGroupStatus::query()
            ->where('research_group_id', 1)
            ->where('status', 'basic')
            ->get();

Remember you must execute the query using get()

how to use AND clause in laravel? because this code almost does what I want and should evaluate to TRUE

ResearchGroupStatus::query()
    ->where('research_group_id', 1)
    ->where('status', 'basic')
    ->get();

i have four status with enum type in laravel (basic, development, commercial, applied) . But with this query, it displays all three statuses like (basic, development, commercial). I just want to show the basics.

The SQL AND operator is implied.

You're changing the requirement; I'm not 100% sure what you're looking for now.

@tykus okay, thank you very much for helping

@mhmmdva why would you reference the docs of another framework, when asking a question about Laravel/Eloquent? Read the docs of laravel on eloquent not this yii framework.

@krisi_gjika I'm sorry, my friend, because I was just looking for references and answers for my ignorance