Question
I'm trying to make a permission system in my C# application.
My Idea is this:
Class: Permission
- string name;
- string value;
Class: Role
- string name
- List<Permission> Permissions;
Class: User
- List<Role> Roles;
- List<Permission> AdditionalPermissions;
Very nice and flexible. I can create roles with permissions, and even custom assign permissions to some users, in special cases.
Entity framework had other plans, in the database, the permission table has a UserID and a RoleID reference, not exactly what i was expecting.
Table: Permissions
- int id;
- nvarchar name;
- nvarchar value;
- int UserID
- int RoleID
Table: Roles
- int id;
- nvarchar name;
Table: Users;
- int id
Can I make entity framework make a structure like below, without having to create the C# classes myself?
Table: Permissions
- int id;
- nvarchar name;
- nvarchar value;
Table: Roles
- int id;
- nvarchar name;
Table: Users;
- int id
Table: Users_Permissions
- int UserID;
- int PermissionID;
Table: Role_Permissions
- int RoleID
- int PermissionID;
Accepted Answer
When you structure your entity classes like this, the db structure turns out the way you want:
public class Permission
{
[Key]
public int Id { get; set; }
public string Name { get; set; }
public string Value { get; set; }
}
public class RolePermission
{
[ForeignKey(nameof(Role))]
public int RoleId { get; set; }
public virtual Role Role { get; set; }
[ForeignKey(nameof(Permission))]
public int PermissionId { get; set; }
public virtual Permission Permission { get; set; }
}
public class Role
{
[Key]
public int Id { get; set; }
public string Name { get; set; }
public virtual ICollection<RolePermission> RolePermissions { get; set; }
}
To ensure the RolePermission table gets a composite primary key of the two foreign keys, add this to your context:
protected override void OnModelCreating(ModelBuilder builder)
{
builder.Entity<RolePermission>().HasKey(table => new {
table.RoleId,
table.PermissionId
});
}
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