I'm trying to use EF Core in combination with Azure CosmosDB. I'm using the following configuration:
Entities:
public class Country
{
public Guid IdCountry { get; set; }
public string Name { get; set; }
public string Code { get; set; }
public string PhoneCode { get; set; }
public IdNameReference Currency { get; set; }
}
public class IdNameReference
{
public Guid Id { get; set; }
public string Name { get; set; }
}
EntityConfiguration class:
public class CountryEntityConfiguration : IEntityTypeConfiguration<Country>
{
public void Configure(EntityTypeBuilder<Country> builder)
{
builder.ToContainer("Country");
builder.HasKey(e => e.IdCountry);
builder.HasPartitionKey(e => e.IdCountry);
builder.HasNoDiscriminator();
builder.Property(e => e.IdCountry).HasConversion<GuidToStringConverter>().ValueGeneratedOnAdd().HasValueGenerator<GuidValueGenerator>();
builder.HasOne(e => e.Currency).WithMany().Metadata.DependentToPrincipal.SetPropertyAccessMode(PropertyAccessMode.Field);
}
}
DbContext OnModelCreating:
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
builder.ApplyConfiguration(new CurrencyEntityConfiguration());
}
And the IServiceCollection configuration:
services.AddDbContext<MyDbContext>(options => options.UseCosmos(
Environment.GetEnvironmentVariable("Db_ServiceEndpoint"),
Environment.GetEnvironmentVariable("Db_AccountKey"),
Environment.GetEnvironmentVariable("Db_DatabaseName")
)
);
But I'm still getting the following error:
The property 'Country.IdCountry' is of type 'Guid' which is not supported by the current database provider. Either change the property CLR type, or ignore the property using the '[NotMapped]' attribute or by using 'EntityTypeBuilder.Ignore' in 'OnModelCreating'
EDIT: I forgot to specify. This happens when I try to add a new item to the context collection
I'm new in CosmosDB and also in configuration of EF this way.
Do you have an idea, where the problem could be?
Okay, I figured it out, I used wrong the ValueConverter.
I used
.HasConversion<GuidToStringConversion>()
but I had to use
.HasConversion<string>()
or
.HasConversion(g => g.ToString("D"), s => new Guid(s))
I hope it will someone :)
Related
I am using the new Azure.Data.Tables library from Microsoft to deal with Azure Table Storage. With the old library when you had an entity that implemented ITableEntity and you had a property that you did not want to save to the storage table you would use the [IgnoreProperty] annotation. However, this does not seem to be available on the new library.
What would be the equivalent on the Azure.Data.Tables package or how do you now avoid saving a property to table storage now?
This is the class I want to persist:
public class MySpatialEntity : ITableEntity
{
public int ObjectId { get; set; }
public string Name { get; set; }
public int MonitoringArea { get; set; }
//This is the property I want to ignore because table storage cannot store it
public Point Geometry { get; set; }
//ITableEntity Members
public virtual string PartitionKey { get => MonitoringArea.ToString(); set => MonitoringArea = int.Parse(value); }
public virtual string RowKey { get => ObjectId.ToString(); set => ObjectId = int.Parse(value); }
public DateTimeOffset? Timestamp { get; set; }
public ETag ETag { get; set; }
}
As of version 12.2.0.beta.1, Azure.Data.Tables table entity models now support ignoring properties during serialization via the [IgnoreDataMember] attribute and renaming properties via the [DataMember(Name="<yourNameHere>")] attribute.
See the changelog here.
I don't think there's anything like [IgnoreProperty] available as of now (at least with version 12.1.0).
I found two Github issues which talk about this:
https://github.com/Azure/azure-sdk-for-net/issues/19782
https://github.com/Azure/azure-sdk-for-net/issues/15383
What you can do is create a custom dictionary of the properties you want to persist in the entity and use that dictionary for add/update operations.
Please see sample code below:
using System;
using System.Collections.Generic;
using System.Drawing;
using Azure;
using Azure.Data.Tables;
namespace SO68633776
{
class Program
{
private static string connectionString = "connection-string";
private static string tableName = "table-name";
static void Main(string[] args)
{
MySpatialEntity mySpatialEntity = new MySpatialEntity()
{
ObjectId = 1,
Name = "Some Value",
MonitoringArea = 2
};
TableEntity entity = new TableEntity(mySpatialEntity.ToDictionary());
TableClient tableClient = new TableClient(connectionString, tableName);
var result = tableClient.AddEntity(entity);
}
}
public class MySpatialEntity: ITableEntity
{
public int ObjectId { get; set; }
public string Name { get; set; }
public int MonitoringArea { get; set; }
//This is the property I want to ignore because table storage cannot store it
public Point Geometry { get; set; }
//ITableEntity Members
public virtual string PartitionKey { get => MonitoringArea.ToString(); set => MonitoringArea = int.Parse(value); }
public virtual string RowKey { get => ObjectId.ToString(); set => ObjectId = int.Parse(value); }
public DateTimeOffset? Timestamp { get; set; }
public ETag ETag { get; set; }
public IDictionary<string, object> ToDictionary()
{
return new Dictionary<string, object>()
{
{"PartitionKey", PartitionKey},
{"RowKey", RowKey},
{"ObjectId", ObjectId},
{"Name", Name},
{"MonitoringArea", MonitoringArea}
};
}
}
}
I modelling a simple library management system that able to register user and the user can issue a book.
I want the asp.net IdentityUser to create one -to many relationShip with BookIssue Custom table. because I am new to asp.net mvc 5, I can not fix the problem please help me.
public class ApplicationUser : IdentityUser
{
public virtual ICollection<BookIssue> BookIssues { get; set; }
public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
{
// Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
// Add custom user claims here
return userIdentity;
}
}
public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
public ApplicationDbContext()
: base("DefaultConnection", throwIfV1Schema: false)
{
}
public DbSet<Book> Books { get; set; }
public DbSet<BookIssue> BookIssues { get; set; }
public DbSet<Catagory> Catagories { get; set; }
public static ApplicationDbContext Create()
{
return new ApplicationDbContext();
}
protected override void OnModelCreating(System.Data.Entity.DbModelBuilder modelBuilder)
{
modelBuilder.Entity<BookIssue>()
.HasRequired(n => n.ApplicationUser)
.WithMany(a => a.BookIssues)
.HasForeignKey(n => n.ApplicationUserId)
.WillCascadeOnDelete(false);
}
}
}
BookIssue Model:
public int BookIssueId { get; set; }
public int BookId { get; set; }
public int ApplicationUserId { get; set; }
public string Email { get; set; }
public DateTime FromDate { get; set; }
public DateTime ToDate { get; set; }
public virtual Book Book { get; set; }
public virtual ApplicationUser ApplicationUser { get; set;
The generated error:
There was an error running the selected code generator. 'Unable to
retrieve metadata for Librart.Models.BookIssuee'.One or more
validation errors were detected during model generation:
Library.Models.IdentityUserLogin: EntityType 'IdentityUserRole' has no
key defined.Define the key for this EntityType.
Library.Models.IdentityUserRole: EntityType 'IdentityUserLogin' has no
key defined.Define the key for this EntityType.
And many other errors are generated.
I am trying to implement DbContext for couple of tables called 'Employee' and 'Department'
Relationship between Employee and Department is many to one. i.e. department can have many employees.
Below are the EntityFramework classes I designed ( CodeFirst approach )
[Table("Employee")]
public class Employee
{
[DatabaseGenerated(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
[Column("Name")]
public string Name { get; set; }
[Column("Department_ID")]
public int Department_ID { get; set; }
public virtual Department Department { get; set; }
}
[Table("Department")]
public class Department
{
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int ID { get; set; }
[Column("Name")]
public string Name { get; set; }
public virtual ICollection<Employee> Employees { get; set; }
}
While adding Employee record I am getting below exception
"Invalid column name 'Department_ID1'."
I am not sure why EF is referring to Department_ID1. Do I need to add configuration in OnModelCreating method of DbContext?
I am using EF version 6.1.1
I've also gotten this problem in my EF one-many deals where the one has a List of the many property and my mapping didn't specify that property. For example take:
public class Notification
{
public long ID { get; set; }
public IList<NotificationRecipient> Recipients { get; set; }
}
then
public class NotificationRecipient
{
public long ID { get; set; }
public long NotificationID { get; set; }
public Notification Notification { get; set; }
}
Then in my mapping, the way that caused the Exception (the incorrect way):
builder.HasOne(x => x.Notification).WithMany()
.HasForeignKey(x => x.NotificationID);
What fixed it (the correct way) was specifying the WithMany property:
builder.HasOne(x => x.Notification).WithMany(x => x.Recipients)
.HasForeignKey(x => x.NotificationID);
Hi After spending some time I could fix this problem by using ForeignKey attribute on public virtual Department Department { get; set; } property of Employee class.
Please see below code.
[Table("Employee")]
public class Employee
{
[DatabaseGenerated(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
[Column("Name")]
public string Name { get; set; }
[Column("Department_ID")]
public int Department_ID { get; set; }
[ForeignKey("Department_ID")]
public virtual Department Department { get; set; }
}
This fixed my problem. Are there any other solution to fix this? Using fluent API?
For me, the issue was resolved by removing a (duplicate?) virtual property.
Using the OP's example:
public class Employee
{
public int Id { get; set; }
public string Name { get; set; }
public int Department_ID { get; set; }
public virtual Department Department { get; set; }
}
public class Department
{
public int ID { get; set; }
public string Name { get; set; }
public virtual ICollection<Employee> Employees { get; set; }
}
Turns into:
public class Employee
{
public int Id { get; set; }
public string Name { get; set; }
public int Department_ID { get; set; }
}
public class Department
{
public int ID { get; set; }
public string Name { get; set; }
public virtual ICollection<Employee> Employees { get; set; }
}
In my case I added a virtual property on top of the auto generated property
I fixed it by adding the NotMapped attribute to my property, or you could configure with fluent api
public partial class Control
{
[NotMapped]
public virtual ICollection<Control> Children { get => this.InverseParent; set => this.InverseParent = value; }
}
I had the same error, my issue was the FK was a long but I had it as an int in the model. EF generated a new column because it didn't match types on the FK so it assumed they weren't the same and went ahead with making another one but putting 1 at the end because there was already one with the proper name. Making sure the types matched resolved the issue for me.
This can be fixed simply by putting [NotMapped] annotation on your virtual properties.
public class Employee
{
[ForeignKey("Department")]
public int Department_ID
[NotMapped]
public virtual Department Department { get; set; }
}
And in you modelBuilder:
modelBuilder.Entity<Employee>(entity =>
{
entity.HasOne(e => e.Department);
});
Just flip this around if you want to call by Department.
We use the [NotMapped] annotation so that EF Core will disregard it when looking at your database.
when i use AutoMapper for mapping my ViewModels and get All News, thrown error for me.
Errors...
The following property on Mosque.Core.ViewModels.CategoryViewModel cannot be mapped:
Categories
Add a custom mapping expression, ignore, add a custom resolver, or modify the destination type Mosque.Core.ViewModels.CategoryViewModel.
please help me, thank you
//Models
public class News
{
public int Id { get; set; }
public string Title { get; set; }
public virtual ICollection<Category> Categories { get; set; }
public virtual User User { get; set; }
}
public class Category
{
public int Id { get; set; }
public string Title { get; set; }
public virtual ICollection<News> News { get; set; }
}
public class User
{
public int Id { get; set; }
public string Name { get; set; }
public virtual ICollection<News> News { get; set; }
}
//ViewModels
public class NewsViewModel
{
public int Id { get; set; }
public string Title { get; set; }
public virtual ICollection<CategoryViewModel> Categories { get; set; }
public virtual UserViewModel User { get; set; }
}
public class CategoryViewModel
{
public int Id { get; set; }
public string Title { get; set; }
public virtual ICollection<NewsViewModel> News { get; set; }
}
public class UserViewModel
{
public int Id { get; set; }
public string Name { get; set; }
public virtual ICollection<NewsViewModel> News { get; set; }
}
how do i use for select All News?
--Update1--
I used onion architecture in the project and i installed AutoMapper in the Service layer and i want get all news from repository and fill into ViewModels and pass to the UI.
my code in service layer is...
public List<NewsViewModel> GetAll()
{
Mapper.CreateMap<News, NewsViewModel>()
.ForMember(dest => dest.Categories, src => src.MapFrom(p => p.Categories))
.ForMember(dest => dest.User, src => src.MapFrom(p => p.User));
Mapper.AssertConfigurationIsValid();
var viewModels = new List<NewsViewModel>();
foreach (var item in _newsRepository.GetAll())
{
var viewModel = Mapper.Map<News, NewsViewModel>(item);
viewModels.Add(viewModel);
}
return viewModels;
}
You don't seem to have created maps for Catagory and User.
Add the following maps:
Mapper.CreateMap<User, UserViewModel>();
Mapper.CreateMap<Category, CategoryViewModel>();
By the way, why are you creating the maps inside the GetAll method? You can create the maps once, usually at application startup.
I have two classes with a one to many relationship.
public partial class Client
{
public Client()
{
this.Client_Local = new HashSet<Client_Local>();
}
public System.Guid Guid { get; set; }
public string Name { get; set; }
public virtual ICollection<Client_Local> Client_Local { get; set; }
}
public partial class Client_Local
{
public System.Guid LocalGuid { get; set; }
public System.Guid Guid { get; set; }
public string CultureID { get; set; }
public string LocalName { get; set; }
public virtual Client Client { get; set; }
}
The mapping classes are:
class ClientMapping : EntityTypeConfiguration<Client>
{
public ClientMapping()
{
this.HasKey(entity => entity.Guid); //As newsequentialid()
this.ToTable("Client");
this.Property(entity => entity.Guid).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
}
}
class Client_LocalMapping : EntityTypeConfiguration<Client_Local>
{
public Client_LocalMapping()
{
this.HasKey(entity => entity.LocalGuid); // as As newsequentialid()
this.ToTable("Client_Local");
this.Property(entity => entity.LocalGuid).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
this.HasRequired<Client>(e => e.Client).WithMany(p => p.Client_Locals).HasForeignKey<Guid>(c => c.Guid);
}
}
I can create new instances of client class and save them to the database successfully. But when I try and add a Client_Local class and save it to the database I get "A dependent property in a ReferentialConstraint is mapped to a store-generated column. Column: 'Guid'.".
The key fields are generated in sql as newsequentialid for performance reasons. And there is a foreign key relationship between Client_Local.Guid and Client.Guid.
Retrieving data from the database works with the above mapping classes. Any help would be greatly appreciated.