HasManyThrough relationship returning empty array

Hello!

I have a database that has several tables, but we only need to focus on 3:

providers

• id
• name
• status
• type_of_care_id

caretype

• id
• name
• category

category

• id
• name

A provider can have 1 care type, and multiple care types can belong to 1 category.

I have a HasManyThrough relationship set up in my CareCategory controller, but it returns an empty array, and I'm not quite sure why:

class CareType extends Model
{
    public function providers() {
        return $this->hasMany('App\Models\Providers', 'type_of_care_id');
    }

    public function category() {
        return $this->belongsTo('App\Models\CareCategory', 'category');
    }
}


class CareCategory extends Model
{
    public function care_type() {
        return $this->hasMany('App\Models\CareType', 'category');
    }

    public function providers()
    {
        return $this->hasManyThrough('App\Models\Provider', 'App\Models\CareType', 'category', 'type_of_care_id', 'id', 'id');
    }
}


class Provider extends Model
{
    public function caretype() {
        return $this->belongsTo('App\Models\CareType', 'type_of_care_id');
    }
}

When I try to get the providers in a specific category like this: $cat_pro = CareCategory::find($id)->providers(); it returns an empty array, even though I know there are providers in that category.

Any help would be greatly appreciated!