I am getting warning errors of no key having been defined for each of my class library classes despite the fact that I have the [Key] tag and including the System.ComponentModel.DataAnnotations namespace, here is my context:
Context:
namespace Project.Data
{
public class ProjectContext : DbContext, IProjectContext
{
public ProjectContext(string connString)
: base(connString)
{
this.Configuration.LazyLoadingEnabled = true;
Database.SetInitializer<ProjectContext>(new ProjectInitializer());
this.Database.CreateIfNotExists();
this.Database.Initialize(true);
}
public IDbSet<Article> Article { get; set; }
public IDbSet<Brand> Brand { get; set; }
public IDbSet<Colour> Colour { get; set; }
public IDbSet<Customer> Customer { get; set; }
public IDbSet<CustomerCredit> CustomerCredit { get; set; }
public IDbSet<Delivery> Delivery { get; set; }
public IDbSet<DesignerTicket> DesignerTicket { get; set; }
public IDbSet<EuroRate> EuroRate { get; set; }
public IDbSet<Gift> Gift { get; set; }
public IDbSet<GZero> GZero { get; set; }
public IDbSet<InvoiceStock> InvoiceStock { get; set; }
public IDbSet<PrintOptions> PrintOptions { get; set; }
public IDbSet<Product> Product { get; set; }
public IDbSet<ProductLocation> ProductLocation { get; set; }
public IDbSet<Sale> Sale { get; set; }
public IDbSet<SaleAccount> SaleAccount { get; set; }
public IDbSet<SalesToWeb> SalesToWeb { get; set; }
public IDbSet<Shop> Shop { get; set; }
public IDbSet<Staff> Staff { get; set; }
public IDbSet<Ticket> Ticket { get; set; }
public IDbSet<Transfer> Transfer { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
}
}
}
Context Interface:
namespace Project.Data
{
public interface IProjectContext
{
IDbSet<Article> Article { get; set; }
IDbSet<Brand> Brand { get; set; }
IDbSet<Colour> Colour { get; set; }
IDbSet<Customer> Customer { get; set; }
IDbSet<CustomerCredit> CustomerCredit { get; set; }
IDbSet<Delivery> Delivery { get; set; }
IDbSet<DesignerTicket> DesignerTicket { get; set; }
IDbSet<EuroRate> EuroRate { get; set; }
IDbSet<Gift> Gift { get; set; }
IDbSet<GZero> GZero { get; set; }
IDbSet<InvoiceStock> InvoiceStock { get; set; }
IDbSet<PrintOptions> PrintOptions { get; set; }
IDbSet<Product> Product { get; set; }
IDbSet<ProductLocation> ProductLocation { get; set; }
IDbSet<Sale> Sale { get; set; }
IDbSet<SaleAccount> SaleAccount { get; set; }
IDbSet<SalesToWeb> SalesToWeb { get; set; }
IDbSet<Shop> Shop { get; set; }
IDbSet<Staff> Staff { get; set; }
IDbSet<Ticket> Ticket { get; set; }
IDbSet<Transfer> Transfer { get; set; }
}
}
[Key] decorated class example:
namespace Project.Data
{
public class Article
{
[Key]
public int ArticleID;
public bool IsCore;
public string Make;
public string Product;
public decimal Sale;
public string Department;
public string Scale;
public string Detail;
public DateTime InDate;
public decimal Reduce;
public bool IsOnSale;
public string VAT;
public bool IsOnWeb;
public string ProductCode;
public string Pick;
public string MemoDetail;
public string LOC;
public string ColourCode;
public bool StatusFlag;
public string Terminal;
}
}
Despite have the [Key] placed on Article I am getting the following message for the article class as shown below and this is repeated for each of the classes:
Project.Data.Article: : EntityType 'Article' has no key defined. Define the key for this EntityType.
Anyone see what I am doing wrong here? would be greatly appreciated
Define the members of your class as public properties as opposed to public variables like you have here, by including {get; set;} at the end of the declaration
Related
Here are Entities:
public class Entity
{
public int Id { get; set; }
public DateTime CreatedOn { get; set; }
public DateTime? ModifiedOn { get; set; }
}
public class EntityBase : Entity
{
[ForeignKey("CreatedBy")]
public int CreatedById { get; set; }
public User CreatedBy { get; set; }
[ForeignKey("ModifiedBy")]
public int? ModifiedById { get; set; }
public User ModifiedBy { get; set; }
}
public class ProjectRequest : EntityBase
{
public string RequestTitle { get; set; }
public string RequestType { get; set; }
...
public virtual ICollection<Material> Materials { get; set; }
public virtual ICollection<Translation> Translations { get; set; }
}
public class Material : EntityBase
{
[ForeignKey("ProjectRequest")]
public int ProjectRequestId { get; set; }
public virtual ProjectRequest ProjectRequest { get; set; }
...
public virtual ICollection<Translation> Translations { get; set; }
}
public class Translation:EntityBase
{
[ForeignKey("ProjectRequest")]
public int ProjectRequestId { get; set; }
public virtual ProjectRequest ProjectRequest { get; set; }
[ForeignKey("Material")]
public int MaterialId { get; set; }
public virtual Material Material { get; set; }
public string ProductMasterText { get; set; }
[MaxLength(40)]
public string ShortDescription { get; set; }
public string MasterDescriptionLine1 { get; set; }
public string MasterDescriptionLine2 { get; set; }
public string MasterDescriptionLine3 { get; set; }
public string LanguageCode { get; set; }
}
No modifications has been done to these entities using fluent API.
Now, whenever I try to insert object of type ProjectRequest with Materials and Translations nested in it, in Translation objects ProjectRequestId is set to 0.
Following is sample Change Tracker snapshot:
Can anyone help me on this? Why ProjectRequestId is 0 but MaterialId properly assigned in Transaltion objects?
I have the following one-to-many database structure generated by code first. Many Buttons can be added with a relation back to a single GSMUnit. BtnNo should be unique (for every GSMUnitId), and shouldn't be duplicated. Currently it is possible to duplicate. how can i prevent this?
public class GSMUnit
{
public int Id { get; set; }
[MaxLength(20)]
public string Model { get; set; }
[MaxLength(40)]
public string GsmName { get; set; }
[MaxLength(40)]
public string TelephoneNum { get; set; }
public int GSMSiteId { get; set; }
public virtual GSMSite GSMSite { get; set; }
public virtual GSMSetting GSMSettings { get; set; }
public virtual ICollection<Button> Buttons { get; set; }
}
public class Button
{
public int Id { get; set; }
[MaxLength(30)]
public string Primary { get; set; }
[MaxLength(30)]
public string Divert1 { get; set; }
[MaxLength(30)]
public string Divert2 { get; set; }
[MaxLength(30)]
public string Divert3 { get; set; }
[MaxLength(20)]
public string AptNo { get; set; }
[MaxLength(10)]
public string Code { get; set; }
[MaxLength(4)]
public string DTO { get; set; }
[MaxLength(4)]
public string Timeband { get; set; }
[MaxLength(15)]
public string BtnNo { get; set; }
[MaxLength(20)]
public string AptName { get; set; }
public int GSMUnitId { get; set; }
public virtual GSMUnit GSMUnit { get; set; }
}
You can use the Index attribute for that:
public class Button
{
public int Id { get; set; }
[MaxLength(30)]
public string Primary { get; set; }
[MaxLength(30)]
public string Divert1 { get; set; }
[MaxLength(30)]
public string Divert2 { get; set; }
[MaxLength(30)]
public string Divert3 { get; set; }
[MaxLength(20)]
public string AptNo { get; set; }
[MaxLength(10)]
public string Code { get; set; }
[MaxLength(4)]
public string DTO { get; set; }
[MaxLength(4)]
public string Timeband { get; set; }
[MaxLength(15)]
public string BtnNo { get; set; }
[MaxLength(20)]
public string AptName { get; set; }
[Index(IsUnique = true)]
public int GSMUnitId { get; set; }
public virtual GSMUnit GSMUnit { get; set; }
}
But I recommend you to take a look on Fluent API. It's easier to configure in my opinion.
I am using Entity Framework. I have tried everything, searching and adding keys but Ienter image description here cannot understand what the problem is and how to resolve it.
public class Reservation
{
[Key]
public int BookingID { get; set; }
public int CustomerID { get; set; }
public int RoomID { get; set; }
public string BookingDate { get; set; }
public int Check_In { get; set; }
public int Check_Out { get; set; }
public int Adults { get; set; }
public int Children { get; set; }
public int NoOfNights { get; set; }
[ForeignKey("RoomID")]
public virtual Room Rooms { get; set; }
[ForeignKey("CustomerID")]
public virtual CustomerDetails CustomerDetail { get; set; }
public virtual ICollection<Payment> Payment { get; set; }
}
public class CustomerDetails
{
[Key]
public int CustomerID { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public int PostCode { get; set; }
public string State { get; set; }
public int PhoneNumber { get; set; }
public string Email { get; set; }
public string Password { get; set; }
public virtual ICollection<Reservation> Reservations { get; set; }
}
enter image description here
All tables need a primary key or you can't use Entity Framework.
public class Category
{
[Key]
public int CategoryId { get; set; }
public int ParentCategoryId { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public int Status { get; set; }
public virtual ICollection<Category> ParentCategories { get; set; }
public virtual ICollection<ImageSet> ImageSets { get; set; }
[ForeignKey("ParentCategoryId")]
public virtual Category ParentCategory { get; set; }
}
public class ImageSet
{
[Key]
public int ImageSetId { get; set; }
public int CategoryId { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public string InsertDate { get; set; }
public int Status { get; set; }
public virtual ICollection<Image> Images { get; set; }
[ForeignKey("CategoryId")]
public virtual Category Category { get; set; }
}
public class Image
{
[Key]
public int ImageId { get; set; }
public int ImageSetId { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public string ImageUrl { get; set; }
public string ThumbImageUrl { get; set; }
public string InsertDate { get; set; }
public int Status { get; set; }
[ForeignKey("ImageSetId")]
public virtual ImageSet ImageSet { get; set; }
}
Context:
public DbSet<Category> Categories { get; set; }
public DbSet<Image> Images { get; set; }
public DbSet<ImageSet> ImageSets { get; set; }
error page:Introducing FOREIGN KEY constraint 'FK_dbo.ImageSets_dbo.Categories_CategoryId' on table 'ImageSets' may
cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or
ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints. Could
not create constraint. See previous errors.
Whats the problem?
You need to add this:
modelBuilder.Entity<ImageSet>()
.HasRequired(is => is.Category)
.WithMany(c => c.ImageSets)
.WillCascadeOnDelete(false);
Here are good explanations of why this is happening :
https://stackoverflow.com/a/19390016/1845408
https://stackoverflow.com/a/17127512/1845408
I have following tables and need to set relationship between them.
Model classes for the tables are as given
public class UserAction
{
public int ActionID { get; set; }
public string ActionName { get; set; }
public virtual ICollection<RoleScreenActionPermission> RoleScreenActionPermissions { get; set; }
}
public class Screen
{
public int ScreenID { get; set; }
public string ScreenName { get; set; }
public virtual ICollection<RoleScreenActionPermission> RoleScreenActionPermissions { get; set; }
}
public class ScreenAction
{
public int ScreenActionID { get; set; }
public int ScreenID { get; set; }
public int ActionID { get; set; }
public virtual Screen Screen { get; set; }
public virtual UserAction UserAction { get; set; }
}
public class RoleScreenActionPermission
{
public int RoleScreenActionPermissionID { get; set; }
public int ScreenActionID { get; set; }
public int RoleID { get; set; }
public virtual ScreenAction ScreenAction { get; set; }
public virtual Role Role { get; set; }
}
The talbe structure created is as:
Please help with setting the relationship correctly.
Try to remove all your own foreign keys from your classes. EF must make it.
upd:
public class Screen
{
public int Id { get; set; }
public string Name { get; set; }
}
public class Action
{
public int Id { get; set; }
public string Name { get; set; }
}
public class ScreenAction
{
public int Id { get; set; }
public virtual Screen Screen { get; set; }
public virtual Action Action { get; set; }
}
public class RoleScreenActionPermission
{
public int Id { get; set; }
public virtual ScreenAction ScreenAction { get; set; }
public virtual Role Role { get; set; }
}