This content originally appeared on DEV Community and was authored by Code Of Accuracy
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:
This content originally appeared on DEV Community and was authored by Code Of Accuracy
Code Of Accuracy | Sciencx (2023-03-23T13:15:27+00:00) HasMany Through Relationship with example and Diagram.. Retrieved from https://www.scien.cx/2023/03/23/hasmany-through-relationship-with-example-and-diagram/
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