Laravel - get model attribute from another model

Question

Class ModelA has relationship belongsTo to ModelB. Is there any way to access that attribute from ModelA? Something like:

$this->model_b->model_b_attribute;

Also, is there a way to chain model to attribute? If I have belongsTo relationship from ModelB to ModelC could I do this:

$this->model_b->model_b_attribute->model_c;

Edit:

My code:

ModelA would be:

class LeaseTenant extends Model {

    protected $appends = ['is_deposit_paid'];

    public function lease_request()
    {
        return $this->belongsTo('App\Models\LeaseRequest');
    }

    public function getIsDepositPaidAttribute()
    {
        return $this->email == $this->lease_request->security_deposit_entry->bank_account->user->email;    
    }
}

And ModelB:

class LeaseRequest extends Model {

    protected $appends = ['security_deposit_entry'];

    public function getSecurityDepositEntryAttribute()
    {
        return Rent
                 ::where('property_id', $this->property_id)
                 ->where('lease_request_id', $this->id)
                 ->where('type', 'security_deposit')
                 ->orderBy('created_at', 'asc')->first();
    }
}

I want to access Rent table from LeaseTenant.

@DiegoCespedes I am not sure how this can help, but I have posted my code — niksrb
– niksrb, Commented May 20, 2019 at 16:46
@niksrb it is important because it helps to understand your actual problem. — Kenny Horna
– Kenny Horna, Commented May 20, 2019 at 16:50
Thanks, I wanted to create attribute in ModelA to access column from ModelC over attribute from ModelB. And it is possible! Thanks agaub — niksrb
– niksrb, Commented May 20, 2019 at 16:57
In your LeaseRequest model, on the query inside your getSecurityDepositEntryAttribute() method I think that search by property_id is redundant given the fact that the LeaseRequest seems to belong to a unique Property. Now, the type used in the Rent is a static one, does this will apply for every LeaseRequest? If so, you could create a relationship directly between LeaseRequest and Rent instead of doing the query manually. But anyway, I'm glad I could help. — Kenny Horna
– Kenny Horna, Commented May 20, 2019 at 16:59

Kenny Horna · Accepted Answer · 2019-05-20 16:47:03Z

1

If you have a relationship belongsTo between ModelA and ModelB:

# ModelA.php

public function modelB()
{
    return $this->belongsTo(ModelA::class);
}

Then you could also access the relationship to get the ModelA instance, from which you can access the ModelA attributes.

$modelA = ModelA::find(1);
$name = $modelA->modelB->name;
//                      ^^^^^^ modelB attribute

Also, if you have another belongsTo relationship inside ModelB, you can do this:

$name = ModelA::find(1)->modelB->modelC->name;
//                                      ^^^^^^ modelC attribute

answered May 20, 2019 at 16:47

Kenny Horna

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