Laravel - Table with two columns, each has ID from different tables - laravel

Question

I need to create a single objective that has a multi-select drop down wherein different departments can share that same objective. I wanted to create a relationship table with an output like this.
Department Table
id | name
1 Science Department
2 Math Department
3 Biology Department
Objective Table
id | name
1 Be the best
Relationship Table
objective_id | department_id
1 1
1 2
1 3
This is what I think of inside the controller.
public function store(Request $request) {
$objective = Objective::updateOrCreate(
[ 'id' => $request->id ?? null ],
[ 'name' => $request->name ]
);
// From multiple select drop down
foreach($request->departments as $department) {
RelationshipTable::updateOrCreate(
[ // what should be the case? ],
[
'objective_id' => $objective->id,
'department_id' => $department['id'],
]
);
}
}
I'm not sure on how I would define this in the Model and how I could call their relationship inside the resource. I even think that my controller is wrong or are there better ways to achieve this?

Answer 1

First You are running query under loop is a very bad process.. may this process will help u? change it as your need!
public function store(Request $request) {
$objective = Objective::updateOrCreate(
[
'id' => $request->id ?? null,
'name' => $request->name
]
);
// From multiple select drop down
$insert_array = [];
foreach($request->departments as $department) {
array_push($insert_array,[
'objective_id' => $objective->id,
'department_id' => $department['id'],
]);
}
RelationshipTable::updateOrCreate($insert_array);
}
//Relationship Should Be Like in this example
Relationship Model
public function object() {
return $this->hasOne('Model Class of Object' , 'objective_id ' , 'id')
}
public function depertment() {
return $this->hasMany('Model Class of depertment' , 'department_id' , 'id')
}