在多对多关系中附加和分离

Question

I have a EmployeeSkill model and table is employee_skills columns are id, employee_id, skill_id

When create user i can assign multiple skills and i want to assign all skills id for the specific user id in employee_skills table.

I have Employees and Skill model.

Answer 1

In many to many relationships between two entities, We have two models and a third table. for more explanation see this and laravel documentation .

you don't need the EmployeeSkill model, delete this, and accord to the laravel recommendation the third table name is better to be singular and in alphabetical order, like this: employee_skill .

Employee model relation:

public function skills()
{
    return $this->belongsToMany(Skill::class);
}

Skil model relation:

public function employees()
{
    return $this->belongsToMany(Employee::class);
}

now when you wanna assign all skills id for a specific employee, you just need to attach or sync :

$employee->skills()->sync({...you skills id...})

// -----

$employee->skills()->attach({...you skills id...})