In Laravel, a has many through
relationship allows you to define a relationship between three models. It's useful when you have a many-to-many relationship
that is connected through an intermediate table.
For example, let's say you have three tables: users
, roles
, and permissions
. Each user can have many roles, and each role can have many permissions. You can define a has many through
relationship to allow a user to access all of their permissions
through their roles
.
Here's an example of how you might define the relationships in your models:
class User extends Model
{
public function roles()
{
return $this->hasMany(Role::class);
}
public function permissions()
{
return $this->hasManyThrough(Permission::class, Role::class);
}
}
class Role extends Model
{
public function users()
{
return $this->belongsTo(User::class);
}
public function permissions()
{
return $this->hasMany(Permission::class);
}
}
class Permission extends Model
{
public function roles()
{
return $this->belongsTo(Role::class);
}
}
In this example, the User
model has a hasManyThrough
relationship with the Permission
model through the Role
model. This allows you to access a user's
permissions
by calling $user->permissions
.
Here's a diagram of the relationship:
Top comments (0)