I have following classes
public class Address
{
public int ID { get; set; }
public AddressType AddressType { get; set; } // ( Enum -- {Correspondence, Billing, Other}
public string AddressLine {get; set;}
public string Town {get; set;}
public string Region {get; set;}
public string PostCode { get; set; }
public string Country {get; set;}
}
}
public class Company
{
[Key]
public int ID { get; set; }
public string LegalName { get; set; }
public string RegistrationNumber { get; set; }
public List<Address> Addresses { get; set; } // Addresses (Correspondence, billing address,physicalAddress etc)
}
public class Person
{
public int ID { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string EmailAddress { get; set; }
public List<Address> Addresses { get; set; }
}
public ActionResult AddCompany()
{
Company Co = new Company();
Address postAddress = new Address() { AddressType = Helper.Enums.AddressType.PostAddress };
Address physicalAddress = new Address() { AddressType = Helper.Enums.AddressType.PhysicalAddress };
org.Addresses = new List<Address>();
org.Addresses.Add(postAddress);
org.Addresses.Add(physicalAddress);
}
I want Address to be added when ever I add Person or Company, but could not do so using Seed method.
EF creates CompanyID in Addresses table why, I want only one way relations, please help
Related
How to create a one-to-many relation between IdentityUser (auto generated Table) and other tables?
in my situation i have users table and want to add a one-to-many relation to Address table, and add userId and userEmail as rows to the Address table.
user table
public class ApplicationUser : IdentityUser
{
public string FirstName { get; set; }
public string LastName { get; set; }
public List<Address> Addresses { get; set; }
}
addresses table
public class Address
{
public int ID { get; set; }
public string AddressName { get; set; }
public string Country { get; set; }
public string FullName { get; set; }
public string MobileNumber { get; set; }
public string FirstDetails { get; set; }
public string SecondDetails { get; set; }
public string BuildingNumber { get; set; }
public string CompanyName { get; set; }
public string StreetName { get; set; }
public string Area { get; set; }
public string City { get; set; }
public int PostalCode { get; set; }
public string NearestLandmark { get; set; }
public ApplicationUser User { get; set; }
}
in my project (Asp.net Core Web Api) I have the tables "Truck" and "UserAccount with a one to many relashionship.
[Table("UserAccount")]
public class UserAccount : BaseClass
{
// Foreign Keys
[ForeignKey(nameof(UserAccountType))]
public int UserAccountTypeId { get; set; }
[ForeignKey(nameof(Gender))]
public int GenderId { get; set; }
[ForeignKey(nameof(Truck))]
public int TruckId { get; set; }
// Properties
public string LastName { get; set; }
public string FirstName { get; set; }
public string UserName { get; set; }
[DataType(DataType.EmailAddress)]
public string Mail { get; set; }
public string Login { get; set; }
[DataType(DataType.Password)]
public string Password { get; set; }
// Navigation Properties
[IgnoreDataMember]
public virtual Gender Gender { get; set; }
//public virtual Truck Truck { get; set; }
[IgnoreDataMember]
public virtual UserAccountType UserAccountType { get; set; }
public Truck Truck { get; set; }
}
[Table("Truck")]
public class Truck : BaseClass
{
// Foreign Keys
// Properties
[Column(Order = 3)]
public string Name { get; set; }
[DataType(DataType.EmailAddress)]
[Column(Order = 4)]
public string Mail { get; set; }
[Column(Order = 5)]
public string Phone { get; set; }
[Column(Order = 6)]
public string VATNumber { get; set; }
// Navigation Properties
public virtual ICollection<TruckFoodType> TruckFoodTypes { get; set; }
public virtual ICollection<TruckOption> TruckOptions { get; set; }
public ICollection<UserAccount> UserAccounts { get; set; }
}
In the method OnModelCreation into my ApplicationDbContex file I have this to create the one to many relashionship:
modelBuilder.Entity<UserAccount>()
.HasOne<Truck>(u => u.Truck)
.WithMany(t => t.UserAccounts)
.HasForeignKey(u => u.TruckId);
But when I try to populate the UserAccount table I have this error message :
"Merge instruction is in conflict with "FK_User_Account_TruckId". This conflict occurse in the database xxx table dbo.Truck column Id" (Sorry, Comes from a french translation)
I don't hunderstand why.
Can somebody help me?
Thanks
OK, stupid mistake. In some cases the TruckId field from the User Account table can be null. So I added a "?" to this fields like this : public int? TruckId { get; set; } Sorry for inconvenience
Can someone please help me with mapping the following hierarchy with EF 6 code first? I can find anything useful for the below example in the documentation.
namespace Contacts {
public class Person
{
public Person()
{
this.Emails = new HashSet<Email>();
}
public long Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public virtual ICollection<Email> Emails { get; set; }
}
public class Company
{
public Company()
{
this.Emails = new HashSet<Email>();
}
public long Id { get; set; }
public string Name { get; set; }
public virtual ICollection<Email> Emails { get; set; }
}
public class Email
{
public string Value { get; set; }
public string Label { get; set; }
public string TargetId { get; set; }
public string TargetType { get; set; }
}
}
TargetType can be set to Company or Person depending on the entity that contains the Email instance.
DB Schema:
I am new to EF and am having trouble figuring how to set up relationship between my main table Investors, with contact information, and a table Notes which can have many notes per investor. Here are the models:
public class Investor
{
public int Id { get; set; }
public string Name { get; set; }
public string Company { get; set; }
public string Email { get; set; }
public string Phone { get; set; }
public string Cell { get; set; }
public string Fax { get; set; }
[Display(Name="Address 1")]
public string Address1 { get; set; }
[Display(Name = "Address 2")]
public string Address2 { get; set; }
public string City { get; set; }
[StringLength(2, ErrorMessage = "State must be 2 characters")]
public string State { get; set; }
public string Zip { get; set; }
public string ContactTableId { get; set; }
[ForeignKey("ContactTableId, ContactId")]
public virtual List<Note> Notes { get; set; }
}
public class Note
{
[Key]
[Column(Order = 0)]
public string ContactTableId { get; set; }
[Key]
[Column(Order = 1)]
public int? ContactId { get; set; }
public string note { get; set; }
public DateTime? DateCreated { get; set; }
}
My attempt as setting this up, as above, generated the error 'The number of properties in the Dependent and Principal Roles in a relationship constraint must be identical.' on the statement:
public ActionResult Index()
{
return View(db.Investors.ToList());
}
in the controller. How do I set this up to make it pull the Notes automagically.
The foreign key is not "ContactTableId, ContactId", it is the single field Investor_Id in table Note (or Notes). EF thinks you try to map the single key to two field and coins this somewhat elusive exception message. But just remove the ForeignKey attribute and EF will use the foreign key field in Note.
When creating many to many relationship using EF 4.3 code first approach, I cannot save data to connecting table, also cannot any examples on how to fill this table using saving object to Icollection... Here is my example:
MODELS
public class Hospital
{
//PK
[Key]
public int Id { get; set; }
public string Name { get; set; }
public string Address { get; set; }
public string City { get; set; }
public string County { get; set; }
public string UserName { get; set; }
public string Password { get; set; }
public Guid User_Id { get; set; }
//FK
public virtual ICollection<Operator> Operators { get; set; }
}
public class Operator
{
//PK
[Key]
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public DateTime Dob { get; set; }
public string Email { get; set; }
//FK
public virtual ICollection<Hospital> Hospitals { get; set; }
}
public class Project: DbContext
{
public DbSet<Hospital> Hospitals { get; set; }
public DbSet<Operator> Operators { get; set; }
}
CONTROLLER
public void AddOperater()
{
Hospital h = new Hospital();
h = db.Hospitals.Single(a=>a.Id ==1);
var o = new Operator();
o.FirstName = "John";
o.LastName = "Doe";
o.Dob = new DateTime(1988,2,12);
o.Email = "johndoe#gmail.com";
o.Hospitals.Add(h);
db.SaveChanges();
}
With this approach I keep getting error here: o.Hospitals.Add(h); even when my Hospital instance is filled with data. How exactly to save data to both tables, the dbo.Operators and dbo.OperatorHospital which is relationship table?
o.Hospitals.Add(h) will fail because the list is a null list. You cannot call Add() on a null list. Typically most people get around this by instantiating the list in the constructor of the entity... like so... the current line is blowing up due to a CSharp issue.
public class Hospital
{
//PK
[Key]
public int Id { get; set; }
public string Name { get; set; }
public string Address { get; set; }
public string City { get; set; }
public string County { get; set; }
public string UserName { get; set; }
public string Password { get; set; }
public Guid User_Id { get; set; }
//FK
public virtual ICollection<Operator> Operators { get; set; }
public Hospital()
{
Operators = new List<Operator>();
}
}
public class Operator
{
//PK
[Key]
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public DateTime Dob { get; set; }
public string Email { get; set; }
//FK
public virtual ICollection<Hospital> Hospitals { get; set; }
public Operator()
{
Hospitals = new List<Hospital>();
}
}