I have an model like this:
public class EquipmentEmployee
{
public int EquipmentEmployeeID { get; set; }
public int EmployeeID { get; set; }
public Employee Employee { get; set; }
public int EquipmentID { get; set; }
public Equipment Equipment { get; set; }
public int RequisitionID { get; set; }
public Requisition Requisition { get; set; }
public DateTime From { get; set; }
public DateTime To { get; set; }
public string Comment { get; set; }
}
I use Mvc scaffolding for creating my controllers, repositories and views. Int the create View I'm not able to POST since I dont have values for "to" and "RequisitionID". I have not added [Required] to them. Is this possible? To POST and have those two null?
You should declare optional fields using a nullable type
public int? RequisitionID { get; set; }
To accept the null values you can use the following solution.
public int? RequisitionID { get; set; }
Related
Here is my Schema and with two Foreign Key in an intermediate table. I am beginner in Core dotnet so unable to crate API to show the department in the school.
public class DepartmentSchool
{
public int Id { get; set; }
public int DepartmentID { get; set; }
[ForeignKey("DepartmentID")]
public virtual Department Department{ get; set; }
public int SchoolsId { get; set; }
[ForeignKey("SchoolsId")]
public virtual Schools Schools { get; set; }
Here I want to get all department related to school id, how can i get all the department though the School id in dotnetcore API.
Here is the school class entity schema.
public partial class Schools
{
public int ID { get; set; }
public string UicCode { get; set; }
public int SchoolSystemsId { get; set; }
public string BannerUrl { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public string ImageUrl { get; set; }
public int UserID { get; set; }
public int? Status { get; set; }
public DateTime? CreatedAt { get; set; }
public int? CreatedBy { get; set; }
public DateTime UpdatedAt { get; set; }
public int? ModifiedBy { get; set; }
[ForeignKey("SchoolSystemsId")]
public PrivateSchoolSystem PrivateSchoolSystems { get; set; }
And more here is the department schema.
public partial class Department
{
public int Id { get; set; }
public string Title { get; set; }
public DateTime CreatedAt { get; set; }
public DateTime UpdatedAt { get; set; }
public int CreatedBy { get; set; }
public int UpdatedBy { get; set; }
public int SchoolSystemsID { get; set; }
[ForeignKey("SchoolSystemsID")]
public virtual PrivateSchoolSystem PrivateSchoolSystems { get; set; }
And I am trying to get a department list in the query in the following controller.
[Route("api/[controller]")]
[ApiController]
public class DepartmentSchoolController : ControllerBase
{
private readonly learning_gpsContext _learning_GpsContext;
public DepartmentSchoolController(learning_gpsContext learning_GpsContext)
{
_learning_GpsContext = learning_GpsContext;
}
[HttpGet("school/{schoolId}/departments")]
public IActionResult GetDepartmentsFromSchool(int schoolId)
{
var school = _learning_GpsContext.Schools.Where(e=>e.Id == schoolId).FirstOrDefault();
if (school == null)
return NotFound();
var departments = _learning_GpsContext.DepartmentSchool
.Where(e=>e.SchoolsId == schoolId).Select(e=>e.Department);
return Ok(departments);
}
For further learning check this tutorial. You should also understand what REST is and for basic questions always take a look at the official documenation.
So I am building an online shop using Code-First MVC
So I created this model classes for now (don't take the types of the attributes too serious for now):
Products (Produto):
public Produto()
{
ListaProdutoEncomenda = new HashSet<Produto_Encomenda>();
}
public int ProdutoID { get; set; }
[Required]
[StringLength(50)]
public string Nome { get; set; }
[Required]
public double Preco { get; set; }
[Required]
public double Peso { get; set; }
[Required]
[StringLength(255)]
public string Descricao { get; set; }
[Required]
public double IVA { get; set; }
public string Imagem { get; set; }
public DateTime UltimaAtualizacao { get; set; }
public int Stock { get; set; }
public int CategoriaID {get;set;}
public virtual ICollection<Produto_Encomenda> ListaProdutoEncomenda { get; set; }
}
Encomenda (Order):
public class Encomenda
{
public Encomenda()
{
ListaProdutoEncomenda = new HashSet<Produto_Encomenda>();
}
[Key]
public int IDEncomenda { get; set; }
[Required]
public DateTime DataSubmissao { get; set; }
[Required]
public DateTime DataEnvio { get; set; }
[Required]
public int EstadoEnvioID { get; set; }
[StringLength(50)]
public string NomeDestino { get; set; }
[Required]
public int TipoExpedicaoID { get; set; }
[Required]
public int RegiaoDestinoID { get; set; }
[StringLength(50)]
public string MoradaDestino { get; set; }
[StringLength(50)]
public string CodPostalDestino { get; set; }
[Required]
[StringLength(50)]
public string MoradaFaturacao { get; set; }
[Required]
[StringLength(50)]
public string CodPostalFaturacao { get; set; }
public virtual ICollection<Produto_Encomenda> ListaProdutoEncomenda { get; set; }
}
And the connection table between the produtos (Products) and Encomenda (Order)
public class Produto_Encomenda
{
[Key]
public int IDProduto_Encomenda { get; set; }
[Required]
public string NomeProduto { get; set; }
[Required]
public int Quantidade { get; set; }
[Required]
public float preco { get; set; }
[Required]
public float IVA { get; set; }
public virtual Encomenda Encomenda { get; set; }
public virtual Produto Produto { get; set; }
[ForeignKey("Encomenda")]
public int IDEncomendaFK { get; set; }
[ForeignKey("Produto")]
public int IDProdutoFK { get; set; }
}
So my question is..
Let's pretend that a costumer buys 2 or 3 products or more.
How can I store all this products in a single line of an order?
Cheers and thanks a lot in advance for the time spent reading.
I'm not sure what you mean by "a single line of an order". Each product is a separate line item, and your entities already model this through the many-to-many relationship.
However, in general this setup is a very bad idea. Your order should not be directly related to products. Instead, your order should simply have an order item, and you'll create those order items based on the products that were sold. The reason for this is that products are very likely to change. If a product is removed because it's no longer available, for example, that doesn't negate the fact that it was previously sold in an order. However, in order for referential integrity to be maintained, any orders sold with that product would have to also have their relationship with that product removed. By having an entirely separate entity, i.e. order item, products can come and go, while the already created orders remain unaffected.
I guess you are looking to make a viewmodel
Create a class that contains Products and Encomenda class as property -
Model -
public class MyViewModel
{
public Produto Pinst{get;set;}
public Encomenda Einst{get;set;}
}
Controller or method-
public void SomeMethod()
{
List<MyViewModel> lst = new List<MyViewModel>();
//Now suppose
foreach(var items in listThatGetCreatedWithBuyerproductInfo)
{
MyViewModel obj = new MyViewModel ();
obj.Pinst = new Produto();
obj.Einst = new Encomenda();
//Here goes your properties from item in respected class instances
obj.Pinst.Nome = items.Nome;
obj.Einst.DataSubmissao = items.DataSubmissao;
//when you are done loading add obj to list
lst.Add(obj);
}
}
Hope it Helps if it does not tell me !!
First off, I know there are a lot of posts about the Unable to determine the principal end of an association between the types error but ever single one I see does not match my issue, if I missed one sorry about that.
I have built an Entity that will end up referencing it's self twice and when I put the code in for the first self reference it works fine, as soon as ad the code for the second it breaks. Doing some testing I have found that if I use either of the self references by them self everything works fine, it is only when I add the second self reference that it breaks. The code I am using for the self references is:
[ForeignKey("ManagerID")]
public User Manager { get; set; }
//Auditing Fields
public DateTime DateCreated { get; set; }
public int? UpdatedByUserID { get; set; }
public DateTime? DateUpdated { get; set; }
public DateTime LastAutoUpdate { get; set; }
[ForeignKey("UpdatedByUserID")]
public User UpdatedByUser { get; set; }
The full entity code block is:
public class User
{
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int ID { get; set; }
public int ADPFileNumber { get; set; }
[Required]
public string ADUserName { get; set; }
public int AirCardCheckInLateCount { get; set; }
[Required]
public string Email { get; set; }
public DateTime? EndDate { get; set; }
[Required]
public string FirstName { get; set; }
[Required]
public string LastName { get; set; }
public int ManagerID { get; set; }
public string MobilePhone { get; set; }
[Required]
public string Office { get; set; }
[Required]
public string Phone { get; set; }
public decimal PTO { get; set; }
public DateTime StartDate { get; set; }
public int VehicleCheckInLateCount { get; set; }
public int WexCardDriverID { get; set; }
[ForeignKey("ManagerID")]
public User Manager { get; set; }
//Auditing Fields
public DateTime DateCreated { get; set; }
public int? UpdatedByUserID { get; set; }
public DateTime? DateUpdated { get; set; }
public DateTime LastAutoUpdate { get; set; }
[ForeignKey("UpdatedByUserID")]
public User UpdatedByUser { get; set; }
}
What am I missing that cause the second self reference to break?
You have to indicate the principal end of both associations explicitly. You can do that with the class you had originally, without inverse collection properties:
modelBuilder.Entity<User>()
.HasOptional(u => u.Manager)
.WithMany()
.HasForeignKey(u => u.ManagerID);
modelBuilder.Entity<User>()
.HasOptional(u => u.UpdatedByUser)
.WithMany()
.HasForeignKey(u => u.UpdatedByUserID);
Note that ManagerID should be an int? as well. You can't create any User if it requires another user to preexist. That's a chicken-and-egg problem.
As mentionned in Multiple self-referencing relationships in Entity Framework, you seem to be missing the other part of the relationship.
i.e.
[InverseProperty("Manager")]
public virtual ICollection<User> ManagedUsers {get;set;}
[InverseProperty("UpdatedByUser")]
public virtual ICollection<User> UpdatedUsers {get;set;}
EDIT: based on #Gert Arnold's answer you should indeed add the [InverseProperty] attribute
I am using EF5 TPT and thus don't expect a discriminator column. Why is it being created?
The ( simplified) table classes are;
[Table("SalesDocumentHeaders")]
public abstract class SalesDocumentHeader : LoggedEntity
{
[ForeignKey("CreatedByUserId")]
public virtual User CreatedBy { get; set; }
[Required]
public int CreatedByUserId { get; set; }
[Required]
public virtual DateTime? DocumentDate { get; set; }
[Required]
public String ReferenceNumber { get; set; }
}
[Table("SalesOrders")]
public class SalesOrder : SalesDocumentHeader
{
[Required]
public String CustomerOrderNumber { get; set; }
public DateTime? DeliverBy { get; set; }
public virtual SortableBindingList<SalesOrderLine> Lines { get; set; }
}
public abstract class LoggedEntity
{
public int Id { get; set; }
public Guid RowId { get; set; }
[ConcurrencyCheck]
public int RowVersionId { get; set; }
}
The context contains
public DbSet<SalesOrder> SalesOrders { get; set; }
public DbSet<SalesDocumentHeader> SalesDocumentHeaders { get; set; }
The SalesDocumentHeader table creates with a Discriminator column. What am I doing wrong?
it makes no difference whether SalesDocumentHeader is declared as abstract or not
because I had another class which inherited from SalesDocumentHeader which I forgot to mark with the table attribute
I think, I've read everything about this error and I tried everything. Here are my models:
Main:
public class Trip
{
public int TripId { get; set; }
public string Name { get; set; }
public string ShortDescription { get; set; }
public string Country { get; set; }
public float BasicPrice { get; set; }
public virtual ICollection<ApartmentType> ApartmentType { get; set; }
public virtual ICollection<TransportMethod> TransportMethod { get; set; }
public virtual ICollection<FeedingType> FeedingType { get; set; }
}
ApartmentType:
public class TransportMethod
{
public int TransportMethodId { get; set; }
public int TripId { get; set; }
public string Name { get; set; }
public float Price { get; set; }
}
FeedingType:
public class FeedingType
{
public int FeedingTypeId { get; set; }
public int TripId { get; set; }
public string Description { get; set; }
public float Price { get; set; }
}
TransportType:
public class TransportMethod
{
public int TransportMethodId { get; set; }
public int TripId { get; set; }
public string Name { get; set; }
public float Price { get; set; }
}
When serializng the Trip entity I get a circular dependency error. Things i tried:
Disable lazy loading in DbContext.
Adding
json.SerializerSettings.PreserveReferencesHandling=Newtonsoft.Json.PreserveReferencesHandling.All; to GLobal.asax
Adding a decorator [IgnoreDataMember] to TripId in every child entity.
Mapping this entity to a ViewModel which doesn't contain the ICollection members. - This worked ok, but at some point I will want to get those lists to the client.
I really don't know what's going on. What am I missing? I really can't spot any circular dependency.
Have you tried adding the [JsonIgnore] attribute to the TripId to the children entities?
http://james.newtonking.com/projects/json/help/html/T_Newtonsoft_Json_JsonIgnoreAttribute.htm
or setting
json.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;