Laravel and Mysql three tables relationship - mysql

Question

I need to add three tables to MySql but I don't know how to organize them.
My tables are :
apartment
floor
surface
And my relations :
apartment can have many floor
apartment can have many surfaces
floor can have many apartment
floor can have many surfaces
surfaces can have one floor (inside apartment's floors)
surfaces can have one apartment
Surfaces are enter after apartment, so I can't use surfaces floor as my apartment floor.
At the moment I have apartment table and floor table with a pivot table (many to many).
In Mysql, what's the best way to handle this ? And after inside laravel ?
Thank for yourhelp !
Edit : my work on laravel so far (only floor table and apartment table)
In Apartment.php :
public function floors(){
return $this->belongsToMany('App\Models\Copro\Floor');
}
In Floor.php :
public function apartments()
{
return $this->belongsToMany('App\Models\Copro\Apartment');
}
Edit 2 : my migration so far :
Schema::create('surfaces', function (Blueprint $table) {
$table->increments('id');
$table->integer('apartment_id')->unsigned()->index();
$table->foreign('apartment_id')->references('id')->on('apartments')->onDelete('cascade');
$table->integer('floor_id')->unsigned()->index();
$table->foreign('floor_id')->references('id')->on('floors')->onDelete('cascade');
$table->decimal('surface',65, 3);
});
Schema::create('apartments', function (Blueprint $table) {
$table->increments('id');
$table->string('nom');
});
Schema::create('floors', function(Blueprint $table)
{
$table->increments('id');
$table->string('nom');
});
Schema::create('apartment_floor', function(Blueprint $table){
$table->increments('id');
$table->integer('apartment_id')->unsigned()->index();
$table->integer('floor_id')->unsigned()->index();
$table->foreign('apartment_id')->references('id')->on('apartments')->onDelete('cascade');
$table->foreign('floor_id')->references('id')->on('floors')->onDelete('cascade');
});

Answer 1

I can think of below kind of relationships in Laravel, I have not created the sample code although but it should help.
Apartment model:
public function floors() {
return $this->belongsTo('App\Models\Copro\Floor', 'floor_id', 'id');
} /* Many apartments belong to single floor. Single floor can have many apartments.*/
public function surfaces() {
return $this->hasMany('App\Models\Copro\Surface', 'surface_id', 'id');
} /* Single apartment has many surfaces */
Floor model:
public function apartments() {
return $this->hasMany('App\Models\Copro\Apartment', 'apartment_id', 'id');
} /* A floor has many apartments */
public function surfaces() {
return $this->hasMany('App\Models\Copro\Surface', 'surface_id', 'id');
} /* A floor has many surfaces */
Surface model:
public function floor() {
return $this->belongsTo('App\Models\Copro\Floor', 'floor_id', 'id');
} /* Surfaces belong to single floor */
public function apartment() {
return $this->hasMany('App\Models\Copro\Apartment', 'apartment_id', 'id');
} /* Surfaces belong to single apartment */
However, it will bring more clarity to the answers if you can provide table schema or migration schema on the same question. Also, you can mention which kinds of SQL queries you are expecting and want to execute. Thanks. Hope this helps.
EDIT:
I am not having PHP installed right now but below schema can be useful to us to at least give newer and better thoughts.
Floor:
id
flr_number
Apartment:
id
apt_number
flr_id
Surface:
id
apt_id
surface
Floor will have many apartments through surfaces. Therefore we can introduce below method in Floor model.
public function surfaces() {
return $this->hasManyThrough(
'App\Models\Copro\Surface',
'App\Models\Copro\Apartment',
'flr_id', /* Foreign key of Apartments table */
'apt_id', /* Foreign key of Surfaces table */
'id', /* Local key of Floors table */
'id' /* Local key of Apartments table */
);
}