Laravel combine multiple collections into one query - laravel

Question

I'm wondering if this is possible. I have 3 models.
Users
TenantPreferances
PropertyAdverts
I'm trying to find out if I can do a query like so.
Find all tenants, whose preferences, match the currently signed in users properties.
The 3 databases are like so
User Model
Schema::create('users', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->string('email')->unique();
$table->string('userType');
$table->string('password');
$table->rememberToken();
$table->timestamps();
});
PropertyAdverts
Schema::create('property_adverts', function (Blueprint $table) {
$table->increments('id');
$table->string("photo");
$table->string('address');
$table->string('county');
$table->string('town');
$table->string('type');
$table->string('rent');
$table->string('date');
$table->string('bedrooms');
$table->string('bathrooms');
$table->string('furnished');
$table->longText('description');
$table->integer('user_id'); //Landlord ID
$table->timestamps();
});
Tenant Preferances
Schema::create('tenant_preferances', function (Blueprint $table) {
$table->increments('id');
$table->string('county');
$table->string('type');
$table->string('rent');
$table->string('bedrooms');
$table->string('bathrooms');
$table->boolean('status')->default('0');
$table->integer('user_id'); //Tenant ID
$table->timestamps();
});

Answer 1

Yes, that is possible. You need to dig in on relations. You can then create a function to define the relation on you model:
function propertyAdverts() {
return $this->hasMany(PropertyAdverts::class);
}
You can access the relation from the user model by using $user->propertyAdverts. If you want to eager load them you can do so:
User::with('propertyAdverts')->find(3);
But notice that Laravel does not do a regular join by default. It first fetches all users, and then fetches all propertyAdverts using a single query using a in statement.