I have an entity for my accessing my pages (pages of a blog).
Here it is:
public class Page
{
[Key]
public int PageId { get; set; }
public string AuthorName { get; set; }
[ForeignKey("AuthorName")]
public virtual MembershipUser Author { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public string Content { get; set; }
public DateTime? PublishDate { get; set; }
public bool Published { get; set; }
public DateTime LastModified { get; set; }
}
As you can see, I would like to keep a reference to the person who created the page (in fact this is the connected user). So I defined an Author member in my class (of type MembershipUser). I also try to define the foreign key but it doesn't work because there is no primary key in the MembershipUser entity. I cannot add one to this entity because if is an aspnet object.
How can I proceed in order to have a reference to the creator of the page in my Page entity?
Thanks.
You can extend the MembershipUser by creating a CustomMembershipUser that will inherit from MembershipUser.
You can add any fields you want to your CustomMembershipUser, you will then also have to create a table of your own with both the original fields and your extra fields.
Here is some documentation that describes how you can do this.
What ORM are you using?
Anyway, you won't be able to reference a class that is not mapped in your ORM. You could create an entity like SystemUser, map it to a table and reference it at your Page entity. When you log in using Membership, you could query that SystemUser and store it in HttpSession so you can use it later.
Related
I have complex type for Audit fields
My complex type:
[ComplexType]
public class AuditData {
[Column("CreatorUserId")]
public int? CreatorUserId { get; set; }
public DateTime? CreationTime { get; set; }
[Column("ModifierUserId")]
public int? ModifierUserId { get; set; }
public DateTime? ModificationTime { get; set; }
}
My base Entity (all other inherti this one) has AuditData property:
public abstract class Entity : IEntity, IAuditedEntity, INotifiedDbContextBeforeSave
{
// Summary:
// Unique identifier for this entity.
public int Id { get; set; }
public bool IsActive { get; set; }
public int Old_Id { get; set; }
public string Old_TableName { get; set; }
[Timestamp]
public byte[] RowVersion { get; set; }
public AuditData AuditData { get; set; }
// can this 2 lines below work as navigation property with foreign key in complex type
public virtual User CreatorUser { get; set; }
public virtual User ModifierUser { get; set; }
//... other fields
}
I have 2 navigation properties CreatorUser and ModifierUser.
I know you cant have navigation property in ComplexType but can my navigation property on entity be mapped with foreign key in complexType
something like:
[ForeignKey("CreatorUserId")] // --> should point to AuditData.CreatorUserId
public virtual User CreatorUser { get; set; }
becouse CreatorUserId will be property in every entity but EF is not aware of it.
Mybe there is solution in fluent API ?
The official documentation says:
Complex types are non-scalar properties of entity types that enable scalar properties to be organized within entities. Like entities, complex types consist of scalar properties or other complex type properties. Because complex types do not have keys, complex type objects cannot be managed by the Entity Framework apart from the parent object.
It follows that that complex types can not participate in any relations among entities, so they can't contain foreign keys
I'm creating MVC5 app, and I'm already using ASP.NET Identity to create users. So, I already have the AspNetUsers table, and whenever user registers I get an entry there. I also have an Admin role, where I manually specify, which registered user is an admin. On the other hand, I also need to register Businesses, and much like normal Users, they will be able to log-in, register, and do some stuff. The point is that they will have both some similar and different fields with/from the normal users. For example, they will also have, e-mail address, password (which I want to be hashed like for normal users), e-mail confirmation, unique id etc. But they have different fields for more information, like their address, zip, country, category, etc. which normal users don't have. How can I achieve this in MVC?
Should I do something like the ApplicationUser class?
public class ApplicationUser : IdentityUser
I mean, should I inherit my Business model from the IdendityUser? If yes, how will my model know which of the fields from IdentityUser to use and which not?
Here is my current Business model:
public class Business
{
public int BusinessID { get; set; }
public string BusinessName { get; set; }
[ForeignKey("Category")]
public int CategoryID { get; set; }
public virtual Category Category { get; set; }
[ForeignKey("Subcategory")]
public int SubcategoryID { get; set; }
public virtual Subcategory Subcategory { get; set; }
public string BusinessAddress { get; set; }
public string BusinessZip { get; set; }
public string BusinessPhone { get; set; }
public string BusinessDescription { get; set; }
public string Facebook { get; set; }
public string Twitter { get; set; }
public byte[] ImageData { get; set; }
public string ImageMimeType { get; set; }
[Range(0.0, 5.0)]
public double BusinessRating { get; set; }
public virtual ICollection<Review> Reviews { get; set; }
}
So, apart from those fields, I want my table to include the stuff similar to AspNetUsers, like Email, EmailConfirmed, PasswordHash, SecurityStamp, etc.
EDIT:
Please note that some of my fields in the Business model are required. And also below you can find my ApplicationUser class.
public class ApplicationUser : IdentityUser
{
public string FirstName { get; set; }
public string LastName { get; set; }
public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
{
// Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
// Add custom user claims here
return userIdentity;
}
}
Use simple inheritance:
public class Business : ApplicationUser
{
...
}
You'll end up with a Discriminator column in your AspNetUsers table that will help Entity Framework identity which class it should instantiate for the row (Business or ApplicationUser). Then you can either just query as normal or if you only want one particular type or another, you can use OfType<T>:
var businessUsers = db.Users.OfType<Business>();
Note: By default, Entity Framework handles simple inheritance with a single table with a Discriminator column. For most cases this works just fine, but you must keep in mind that any property you add to subclasses of your base class, must be nullable. You cannot require something like a DateTime on Business to be required at the database-level, because then you could never save an ApplicationUser, which does not that property. However, this is only an issue at the database-level. You can still use view models to make a particular property on Business required from a front-end perspective.
I have 2 tables. User and Roles.One user can have meany roles. so i created another table called RoleUser. how should i implement this in code first(i want to insert and update operation)
thanks in advance
Natively you should be able to declare the two tables (with properties pointing to the other) and EF will pick up on the many-to-many relationship (and create the intermediary table with two FK's)
public class user
{
public int id { get; set; }
public string username { get; set; }
// user can be within multiple roles
public ICollection<role> roles { get; set; }
}
public class role
{
public int id { get; set; }
public string name { get; set; }
// role can have many users
public ICollection<user> users { get; set; }
}
I want to display customer information.
Then I created some classes; Customer, Delivery, Order, OrderLine, Product, and rentalDB.
rentalDB class sets 5 DbSet of Product, Customer, Order, OrderLine, and Delivery.
When I make UserController with list view, I cannot display the customer information, and it takes errors:
One or more validation errors were detected during model generation:
System.Data.Edm.EdmEntityType: : EntityType 'OrderLine' has no key defined. Define the key for this EntityType.
System.Data.Edm.EdmEntityType: : EntityType 'Delivery' has no key defined. Define the key for this EntityType.
System.Data.Edm.EdmEntitySet: EntityType: EntitySet �OrderLine� is based on type �OrderLine� that has no keys defined.
System.Data.Edm.EdmEntitySet: EntityType: EntitySet �Delivery� is based on type �Delivery� that has no keys defined.
I don't know why these entities require key?
I have no idea for this error..
Could you help me?
--UserController.cs--
namespace MvcApplication2.Controllers
{
public class UserController : Controller
{
//
// GET: /User/
rentalDB _db = new rentalDB();
public ActionResult Index()
{
var model = _db.Customer;
return View(model);
}
}
}
--Delivery.cs in Models folder--
namespace MvcApplication2.Models
{
public class Delivery
{
public int trackId { get; set; }
public String address { get; set; }
public String postCode { get; set; }
public decimal deliveryPrice { get; set; }
public DateTime deliveryDate { get; set; }
public DateTime returnDate { get; set; }
}
}
--OrderLine.cs in Models folder--
namespace MvcApplication2.Models
{
public class OrderLine
{
public int basketId { get; set; }
public int productId { get; set; }
public int quantity { get; set; }
}
}
In order to use the entity framework, every entity needs a key. This is how EF tracks objects in its cache, posts updates back to the underlying data store, and links related objects together.
Yours objects already have keys, you just need to tell the EF about them:
namespace MvcApplication2.Models
{
public class Delivery
{
[Key] public int trackId { get; set; }
public String address { get; set; }
public String postCode { get; set; }
public decimal deliveryPrice { get; set; }
public DateTime deliveryDate { get; set; }
public DateTime returnDate { get; set; }
}
}
When you use an ORM (object-relational mapper) framework like NHibernate or Entity framework that helps you map a relational database to an object model you need something that will let you make a meaningful relation between your objects in memory and rows of data in your database and that thing is a key (id as NHibernate call it) and usually that's the natural way that RDBMS track records using a Primary key (usually you use DB primary key as the key of your object)
When you check to see if two objects are equal using == operator you are checking that those objects have the same reference (or address in memory). This kind of equality is not very helpful when you are using an ORM .You can load multiple instances of a record in memory with different references so that it's impossible to check the equality of objects by their references .That's when checking equality by value come into play and keys have the main role in this play.
I have the following two entities:
public class User
{
public int PKID { get; set; }
public string Login { get; set; }
public string Username { get; set; }
public string Password { get; set; }
public virtual ICollection<AppAccess> AppAccessList { get; set; }
}
public class AppAccess
{
public int PKID {get; set; }
public string Login { get; set; }
public string AppCode { get; set; }
}
The PKID field is the primary key and identity column of each table but the Login field is what links them in a one-to-many relationship where the User is the principal entity.
How can I setup the navigation property AppAccessList using the fluent API, if it is even possible, to use the Login field as the relationship key? BTW, the entities are based on existing schema that cannot be refactored at this time.
I don't believe this is possible out of the box, certainly not the ability to add a navigation property. I tried using the new power tools to reverse engineer a database and it just ignored the relationship, neither could i create it using code (annotations or fluent interface).
You can create the relationship using raw sql on the on OnModelCreating method to make the constraint, but you'd need to use join's manually to navigate between the tables.