I am using .net core 3.1
public class Person
{
public int Id { get; set; }
[Required]
[MaxLength(50)]
public string FirstName { get; set; }
[Required]
[MaxLength(50)]
public string LastName { get; set; }
[Required]
public DateTime DateOfBirth { get; set; }
**[Column(TypeName = "jsonb")]**
public IList<Address> Addresses { get; set; }
}
public class Address
{
public string Type { get; set; }
public string Company { get; set; }
public string Number { get; set; }
public string Street { get; set; }
public string City { get; set; }
}
But, when I ran add migration command that generating new table for Addresses, that I don't want
I just want to capture address list in jsonb format but not in separate table.
I am using fluent api for configuration (just for understanding above class is decorated), do we have any property where I can specify to not generate new table for any object type property.
I tried - [NotMapped] but this ignore that specific column entirely
Thank you!
Related
This is my model (semplified):
PRAT is the main table
public partial class PRAT
{
public int ID { get; set; }
public string PRATICA { get; set; }
public int ANNO { get; set; }
public string VARIANTE { get; set; }
[ForeignKey("ID")]
public VW_PRATICHE_CONTIPO VW_PRATICHE_CONTIPO { get; set; }
}
VW_PRATICHE_CONTIPO is a View (not a table!) in the database that contains some data related to PRAT table
public class VW_PRATICHE_CONTIPO
{
public int ID { get; set; }
public DateTime? DATAPRES { get; set; }
public string PROTGEN { get; set; }
public string TIPO { get; set; }
public string TIPOEXTRA { get; set; }
public string TIPOISTANZA { get; set; }
public string TIPOPRAT { get; set; }
}
The one-to-one relation between the table and the View is based on the ID field.
I need this because I want to do a query like this:
context.PRAT.Include(x=> x.VW_PRATICHE_CONTIPO)
This query works as exptected.
The problem happens when I try to save a new entity in PRAT.
When i do this:
context.PRAT.Add(prat);
await context.SaveChangesAsync();
I got this error:
The property 'ID' on entity type 'PRAT' has a temporary value. Either set a permanent value explicitly or ensure that the database is configured to generate values for this property.
If I remove the navigation property from PRAT all works fine, but I can't do the Include in my Query.
Can anybody help me?
Thank you.
Say I have a table Company defined in following entity:
public class Company
{
public Guid CompanyId { get; set; }
[Required]
public string Name { get; set; }
[MaxLength(50)]
public string Uid { get; set; }
...
}
And I need another table CompanyHistory what will have all fields of Company extended with CompanyHistoryId, EffectiveDate, DEffectiveDate.
I have tried it like this:
public class CompanyHistory : Company
{
public Guid CompanyHistoryId { get; set; }
public virtual Company { get; set; }
}
But instead of 2 tables migration makes one and combines all the columns.
How can I get same result without writing all the column again as is done here:
public class CompanyHistory
{
public Guid CompanyHistoryId { get; set; }
public Guid CompanyId { get; set; }
public virtual Company Company { get; set; }
[Required]
public string Name { get; set; }
[MaxLength(50)]
public string Uid { get; set; }
...
}
Is it possible to store an IEnumerable<string> in Entity Framework?
I'm using code-first in ASP.NET MVC5 and I have a model that looks a little like this, but ImageUris does not appear as a column in my database (all the other properties do).
public class Product
{
[Key]
public int Id { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public string Condition { get; set; }
public decimal Price { get; set; }
public IEnumerable<string> ImageUris { get; set; }
}
PS: In case you are interested in why I'm storing Uris rather than images themselves, they are uris to Azure Storage Blobs.
You cannot save multiple records in single column of the relational database. There is no such data type that supports this.
You can create a separate table for Image Uris and then store your image Uris there.
Your entity code would look something like this:
public class Product
{
[Key]
public int Id { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public string Condition { get; set; }
public decimal Price { get; set; }
public virtual ICollection<ImageUri> ImageUris { get; set; }
}
public class ImageUri
{
[Key]
public int Id { get; set; }
public string Uri { get; set; }
}
I am issuing a very strange scenario using Code first with existing database and asp.net identity entity framework. I have a simple userprofile model
[Table("CSUserProfile")]
public partial class UserProfile
{
[Key]
public string Id { get; set; }
[Required]
[Display(Name = "FirstName")]
public string FirstName { get; set; }
[Required]
[Display(Name = "LastName")]
public string LastName { get; set; }
[Required]
[Display(Name = "Phone")]
public string Phone { get; set; }
[Required]
public string Email { get; set; }
[Required]
[Display(Name = "Location")]
public string Location { get; set; }
[Required]
[Display(Name = "HomeTown")]
public string Hometown { get; set; }
public byte[] BlobData { get; set; }
[ForeignKey("fPersonLinkGID")]
public virtual List<ProfilePic> ProfilePic { get; set; }
}
and an image profile pic
[Table("CSProfilePic")]
public partial class ProfilePic
{
[Key]
public Guid? GID { get; set; }
public string fPersonLinkGID { get; set; }
public byte[] BlobData { get; set; }
}
the foreign key is the fPersonLinkGID. everything works fine but my problem is that if i want an one-to-one relation between the userprofile and the image like this
public virtual ProfilePic ProfilePic { get; set; }
(which is the correct scenario) I am getting this strange exception :
The ForeignKeyAttribute on property 'ProfilePic' on type 'eUni.Model.Application.UserProfile' is not valid. The foreign key name 'fPersonLinkGID' was not found on the dependent type 'eUni.Model.Application.UserProfile'. The Name value should be a comma separated list of foreign key property names.
I can not understand why I am getting that exception
You could read this answer. It introduces how to configure one to one relationship by HasRequired and WithOptional.
As for me, I will create one to one relationship by following way.
public class Store {
[Key]
public long Id { get; set; }
public virtual Item TheItem { get; set; }
// ....
}
public class Item {
// It is FK, and also PK.
[Key, ForeignKey("TheStore")]
public long Id { get; set; }
// The same string in the ForeignKey attribute. Ex: ForeignKey("TheStore")
public virtual Store TheStore { get; set; }
// ....
}
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.