How to deploy relationship in pivot of three model in laravel? - php

Question

I'm developing a role and permissions based on laravel framework.
I have 3 models :
Weblog
User
Permissions
This is pivot table
user_id , weblog_id , permission_id
Now, a user can have a weblog with permission id 1,2 and another weblog with permission 1,2,3,4
How can I deploy relationships? and how can I check user permissions when managing a weblog. (middleware and ...)

Answer 1

With the fact that Permission are specific to Weblog
Say the pivot table is called permission_user_weblog
class User extends Model
{
public function weblogs()
{
return $this->belongsToMany(Weblog::class, 'permission_user_weblog');
}
public function permissionsFor(int $weblogId)
{
$permissionIds = null;
$this->weblogs()
->where('id', $weblogId)
->with('permissions')
->get()
->each(function($weblog) use(&$permissionIds) {
$permissionIds = $weblog->permissions->pluck('id');
});
return $permissionIds;
}
}
class Weblog extends Model
{
public function users()
{
return $this->belongsToMany(User::class, 'permission_user_weblog');
}
public function permissions()
{
return $this->belongsToMany(Permission::class, 'permission_user_weblog');
}
}
class Permission extends Model
{
public function weblogs()
{
return $this->belongsToMany(Weblog::class, 'permission_user_weblog');
}
}
Then you can check anywhere for whether logged in user has specific permission for a specific weblog
public function update(Request $request, $weblogId)
{
$user = auth()->user();
$permissions = $user->permissionsFor($weblogId);
//Check whether the logged in user has permission identified by id 1 or 4 for weblog
$can = !! $permissions->intersect([1,4])->count();
//Do rest of processing
}

Answer 2

your Weblog,User,Permission has ManyToMany Relation, its a kind of odd but if you want to have this kind of relation its not a problem.
just consider each pair a ManyToMany. and every one of those can have a hasMany to Pivot (i named it Access) too (based on your needs).
User model:
class User extends Model{
/**
* retrive weblogs
*
* #return BelongsToMany weblogs
*/
public function weblogs()
{
return $this->belongsToMany(App\WebLog::class,'accesses_table')
->withPivot("permission_id")
->using(App\Access::class);
}
/**
* retrive permissions
*
* #return BelongsToMany permissions
*/
public function permissions()
{
return $this->belongsToMany(App\Permission::class,'accesses_table')
->withPivot("weblog_id")
->using(App\Access::class);
}
/**
* retrive access
*
* #return hasMany [description]
*/
public function accesses()
{
return $this->hasMany(App\Access::class, "user_id");
}
}
Weblog model:
class Weblog extends Model{
/**
* retrive users
*
* #return BelongsToMany users
*/
public function users()
{
return $this->belongsToMany(App\User::class,'accesses_table')
->withPivot("permission_id")
->using(App\Access::class);
}
/**
* retrive permissions
*
* #return BelongsToMany permissions
*/
public function permissions()
{
return $this->belongsToMany(App\Permission::class,'accesses_table')
->withPivot("user_id")
->using(App\Access::class);
}
/**
* retrive access
*
* #return hasMany [description]
*/
public function accesses()
{
return $this->hasMany(App\Access::class, "weblog_id");
}
}
Permission model:
class Permission extends Model{
/**
* retrieve users
*
* #return BelongsToMany users
*/
public function users()
{
return $this->belongsToMany(App\User::class,'accesses_table')
->withPivot("weblog_id")
->using(App\Access::class);
}
/**
* retrieve weblogs
*
* #return BelongsToMany weblogs
*/
public function weblogs()
{
return $this->belongsToMany(App\Weblog::class,'accesses_table')
->withPivot("user_id")
->using(App\Access::class);
}
/**
* retrive access
*
* #return hasMany [description]
*/
public function accesses()
{
return $this->hasMany(App\Access::class, "permission_id");
}
}
and you can have a model for your pivot, which i named it Access :
Illuminate\Database\Eloquent\Relations\Pivot;
class Access extends Pivot
{
public $incrementing = true;
public function user()
{
return $this->belongsTo(App\User::class);
}
public function weblog()
{
return $this->belongsTo(App\Weblog::class);
}
public function permission()
{
return $this->belongsTo(App\Permission::class);
}
}