Laravel Why pivot table is empty? - php

Question

I have a simple relationship in laravel eroquent
Here is the bidders table creation
public function up()
{
Schema::create('bidders', function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('params_name');
$table->string('params_value');
$table->string('bidder_name');
$table->timestamps();
});
}
Here is bidder_parameter table creation
public function up()
{
Schema::create('bidder_parameters', function (Blueprint $table) {
$table->bigIncrements('id');
$table->unsignedBigInteger('bidder_id');
$table->foreign('bidder_id')->references('id')->on('bidders')->onDelete('cascade');
$table->timestamps();
});
}
Here is a bidder model
class Bidder extends Model
{
protected $table = 'bidders';
protected $fillable = [
"params_name",
"params_value",
"bidder_name"
];
public function page()
{
return $this->hasMany('App\Page');
}
public function parameters()
{
return $this->hasMany('App\BidderParameter');
}
}
and here is BidderParameter model
class BidderParameter extends Model
{
public function parameters()
{
return $this->belongsTo('App\Bidder');
}
}
Here is parameter controller for inserting data to database
public function store(Request $request){
// dd($request);
if($request->ajax())
{
$rules = array(
'params_name.*' => 'required',
'params_value.*' => 'required',
'bidders_name.*' => 'required'
);
$error = Validator::make($request->all(), $rules);
if($error->fails())
{
return response()->json([
'error' => $error->errors()->all()
]);
}
$params_name = $request->params_name;
$params_value =$request->params_value;
$bidders_name =$request->bidders_name;
for($count = 0; $count < count($params_name); $count++)
{
$data = array(
'params_name' => $params_name[$count],
'params_value' => $params_value[$count],
'bidders_name' => $bidders_name[$count],
);
$insert_data[] = $data;
// dd($insert_data);
}
Bidders:insert($insert_data);
return response()->json([
'success' => 'Data Added successfully.'
]);
}
}
Now when I submit data to the database 'bidders tablehave data saved into it butbidder_parameter` is empty
What is wrong with my code?

Answer 1

Many to many relationship contains 3 tables. 2 tables are main and 3rd table is combination of those 2 tables' primary keys.
For example
User can have many roles
and
Role can belong to many users
so that requires many to many relationship
So we need a database schema like this:
Users table -> (id, name ,...) e.g. Jonn Doe with id 1
Roles table -> (id, name, ...) e.g. SUPER_ADMIN with 1
role_user table (id, user_id, role_id) role_id is foreign key of roles table and user_id is foreign key of users table
Now in Model classes:
In User Model
public function roles(){
return $this->belongsToMany(Role::class,'role_user','user_id','role_id');
}
Now in Roles class
public function users(){
return $this->belongsToMany(User::class,'role_user','role_id','user_id');
//note keys are in opposite order as in roles() method
}
Now you can call function from User instance and Role instance where you want
$user->roles // as collection
$user->roles() // as eloquent instance
Also
$role->users // as collection
$role->users() // as eloquent instance
You can read more here