BasketItem duplicateBasketItem = (from ph in storeDB.BasketItems
where ph.sellerSKU == newItem.sellerSKU
select ph).SingleOrDefault();
{"Invalid column name 'BasketID'."}
My Classes:
public class Basket
{
[Key]
public string BasketID { get; set; }
public virtual IList<BasketItem> BasketItems { get; set; }
public int? Count { get; set; }
public System.DateTime DateCreated { get; set; }
public Guid UserID { get; set; }
}
public class BasketItem
{
[Key]
public int BasketItemID { get; set; }
public virtual string BasketID { get; set; }
[Required]
public int sellerID { get; set; }
[Required]
public string sellerSKU { get; set; }
[Required]
public int Quantity { get; set; }
[Required]
public decimal Price { get; set; }
}
From the research i have done so far, the error is being cause due to relationships not being mapped properly. How would I map the relationship using modelbuilder
Each basket can(optional) contain many basketitems
Each BasketItem has a BaskedID(FK) to map back to the individual Basket.
Related
I am using EF Core db first approach, .NET6. I have the following classes:
public class Doctor
{
[Key]
public int DoctorId { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Specialization { get; set; }
public string Phone { get; set; }
public string Email { get; set; }
public string Designation { get; set; }
public bool IsDeleted { get; set; }
}
and
public class Patient
{
[Key]
public int PatientId { get; set; }
[Required]
public string FirstName { get; set; }
public string LastName { get; set; }
public string Email { get; set; }
public string NIC { get; set; }
public string Phone { get; set; }
public string Address { get; set; }
public string City { get; set; }
public string Country { get; set; }
public DateTime DOB { get; set; }
public string Gender { get; set; }
public string Reference { get; set; }
public short SerialNumberYear { get; set; }
public int SerialNumber { get; set; }
[Required]
public int DoctorId { get; set; } //need to assign Primary doc. Is this correct?
public Doctor Doctor { get; set; }
public DateTime CreatedOn { get; set; }
public DateTime UpdatedOn { get; set; }
public string CreatedBy { get; set; }
public List<Doctor> SecondaryDoctors { get; set; }//need to assign a list of secondary docs. is this correct?
public bool SMS_Allowed { get; set; }
public bool Email_Allowed { get; set; }
public string SpecialConcern1 { get; set; }
public string SpecialConcern2 { get; set; }
public string SpecialConcern3 { get; set; }
public string SpecialConcern4 { get; set; }
}
The Patient class needs to have a Primary doctor assigned and a list of Secondary doctors assigned. What entries should I make in the Patient class to accomodate this requirement? I tried the entries shown above with comments. Is that correct? When I add a patient with this code, I get the following error when creating a new patient record:
Duplicate entry '1' for key 'doctors.PRIMARY'
So when creating a patient, why is efcore trying to create a doctor record?
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.
Given
public class Customer
{
public int Id { get; set; }
[Required]
[StringLength(255)]
public string Name { get; set; }
[Required]
public DateTime DateOfBirth { get; set; }
public bool IsSubscribed { get; set; }
public MembershipType MembershipType { get; set;}
public byte MembershipTypeId { get; set; }
}
why does
onDb = _context.Customers.Single(c => c.Id == customer.Id);
populate the MembershipType object??? I don't want that to happen.
Is it because I have loaded the customer with the same ID before?
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
In have two classes;
public class Item
{
[Key]
public int Id { get; set; }
[Required]
public string Name { get; set; }
public virtual BinCard BinCard { get; set; }
}
and
public class BinCard
{
[Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
[Required]
public int ItemId { get; set; }
[Required]
public DateTime Date { get; set; }
[Required]
public double Qty { get; set; }
public ObservableCollection<Item> Item { get; set; }
}
The BinCard.Id is the PK and auto increments.
I want the relationship between two tables using Item.Id and BinCard.ItemId using*FluentAPI*.
Please help me to create this relationship correctly.
EF does not support non-PK principal Ids because it doesn't support unique keys other than PKs yet. To make this work you will have to create relationship based on BinCard.Id and BinCardId to Item entity - btw. it looks like the correct way to build relationship in your model. Your current model looks really strange.
Thanks for all replies. This is the solution for my question.
public class BinCard
{
[Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
[Required]
public int ItemId { get; set; }
[Required]
public DateTime Date { get; set; }
[Required]
public double Qty { get; set; }
public virtual Drug Drug { get; set; }
}
public class Item
{
[Key]
public int Id { get; set; }
[Required]
public string Name { get; set; }
public ObservableCollection<BinCard> BinCard { get; set; }
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Drug>()
.HasRequired(s => s.Stock)
.WithRequiredPrincipal(s => s.Drug);
}