I´m using ef-core inheritance like this:
public abstract class Person
{
public int Id { get; set; }
public string Name { get; set; }
public PersonType PersonType { get; set; }
public int PersonTypeId { get; set; }
public double Height { get; set; }
[Timestamp]
public byte[] Timestamp { get; set; }
}
public class Daughter : Person
{
public double Weigth { get; set; }
public DateTime SomeDate { get; set; }
}
public abstract class Son : Person
{
public DateTime BirthDate { get; set; }
public DateTime GraduationDate { get; set; }
}
public class SingleSon : Son
{
}
public class SonWithDaughter : Son
{
public int Daughter { get; set; }
public Daughter Daughter { get; set; }
}
In DbContext:
public DbSet<PersonType> PersonTypes { get; set; }
public DbSet<Daughter> Daughters { get; set; }
public DbSet<SingleSon> SingleSons { get; set; }
public DbSet<SonWithDaughter> SonWithDaughters { get; set; }
When I update sql server database (dotnet ef database update) it throws a
System.InvalidOperationException, Sequence contains more than one
matching element
Any ideas about how to solve this?
UPDATE
ef migrations console output
This is issue #5894. It will be fixed in version 1.0.1. Until that's released, you can use the nightly feed.
Related
Here are Entities:
public class Entity
{
public int Id { get; set; }
public DateTime CreatedOn { get; set; }
public DateTime? ModifiedOn { get; set; }
}
public class EntityBase : Entity
{
[ForeignKey("CreatedBy")]
public int CreatedById { get; set; }
public User CreatedBy { get; set; }
[ForeignKey("ModifiedBy")]
public int? ModifiedById { get; set; }
public User ModifiedBy { get; set; }
}
public class ProjectRequest : EntityBase
{
public string RequestTitle { get; set; }
public string RequestType { get; set; }
...
public virtual ICollection<Material> Materials { get; set; }
public virtual ICollection<Translation> Translations { get; set; }
}
public class Material : EntityBase
{
[ForeignKey("ProjectRequest")]
public int ProjectRequestId { get; set; }
public virtual ProjectRequest ProjectRequest { get; set; }
...
public virtual ICollection<Translation> Translations { get; set; }
}
public class Translation:EntityBase
{
[ForeignKey("ProjectRequest")]
public int ProjectRequestId { get; set; }
public virtual ProjectRequest ProjectRequest { get; set; }
[ForeignKey("Material")]
public int MaterialId { get; set; }
public virtual Material Material { get; set; }
public string ProductMasterText { get; set; }
[MaxLength(40)]
public string ShortDescription { get; set; }
public string MasterDescriptionLine1 { get; set; }
public string MasterDescriptionLine2 { get; set; }
public string MasterDescriptionLine3 { get; set; }
public string LanguageCode { get; set; }
}
No modifications has been done to these entities using fluent API.
Now, whenever I try to insert object of type ProjectRequest with Materials and Translations nested in it, in Translation objects ProjectRequestId is set to 0.
Following is sample Change Tracker snapshot:
Can anyone help me on this? Why ProjectRequestId is 0 but MaterialId properly assigned in Transaltion objects?
I'm using Entity Framework 6.0 and have defined 2 POCO's to map to my database:
[Table("PortfolioGroups")]
public class PortfolioGroup : AuditableEntity<int>
{
[Column("Company_Id")]
public int CompanyId { get; set; }
[ForeignKey("CompanyId")]
public Company Company { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public ICollection<PortfolioGroupItem> PortfolioGroupItems { get; set; }
public PortfolioGroup()
{
PortfolioGroupItems = new Collection<PortfolioGroupItem>();
}
}
And the PortfolioGroupItem:
[Table("PortfolioGroupItems")]
public class PortfolioGroupItem : AuditableEntity<int>
{
[Column("PortfolioGroup_Id")]
public int PortfolioGroupId { get; set; }
[ForeignKey("PortfolioGroupId")]
public PortfolioGroup PortfolioGroup { get; set; }
[Column("Trademark_Id")]
public int? TrademarkId { get; set; }
[ForeignKey("TrademarkId")]
public Trademark.Trademark Trademark { get; set; }
[Column("TrademarkRegistration_Id")]
public int? TrademarkRegistrationId { get; set; }
[ForeignKey("TrademarkRegistrationId")]
public TrademarkRegistration TrademarkRegistration { get; set; }
[Column("Domain_Id")]
public int? DomainId { get; set; }
[ForeignKey("DomainId")]
public Domains.Domain Domain { get; set; }
}
However - when I attempt to query the PortfolioGroups, Entity Framework for some reason attempts to query a field named "Trademark_Id" - which doesn't exist on the PortfolioGroup entity:
Context.PortfolioGroups.SingleOrDefault(i => i.Id == id && i.CompanyId == companyId);
Throws:
Invalid column name 'Trademark_Id'.
I've used this kind of setup other places in my application without any problems. I simply cannot find out why EF is trying to query a column that's not in my entity!
Any suggestions would be greatly appreciated. I'm at the end of my rope here.
Thanks guys! :)
The problem is that you've added a Navigation Property on Trademark that requires a Foreign Key on Portfolio Group:
public class Trademark
{
[Key]
public int Id { get; set; }
[MaxLength(250)]
[Required]
public string Name { get; set; }
[MaxLength(150)]
public string Filename { get; set; }
public ICollection<PortfolioGroup> PortfolioGroups { get; set; }
public Trademark()
{
PortfolioGroups = new Collection<PortfolioGroup>();
}
}
EF expects PortfolioGorup to have a Trademark_ID column to store which PortfolioGroups are associated with a Trademark.
This question already has answers here:
EF Core returns null relations until direct access
(2 answers)
Closed 4 years ago.
So I have 3 classes:
public class OwnerDto
{
public int Id { get; set; }
public string Name { get; set; }
public string EmailAddress { get; set; }
}
public class SitterDto
{
public int Id { get; set; }
public string Name { get; set; }
public string EmailAddress { get; set; }
}
public class ReviewDto
{
public int Id { get; set; }
public int Rating { get; set; }
//[ForeignKey("OwnerId")]
public OwnerDto Owner { get; set; }
//[ForeignKey("SitterId")]
public SitterDto Sitter { get; set; }
}
But I can't figure out how to do the proper modelBuilder. Everything I tried fails :( I am learning so bear with me.
My closest attempt was this:
modelBuilder.Entity<ReviewDto>()
.HasOne(t => t.Owner).WithMany().HasForeignKey("OwnerId");
Basically Owner and Sitter are always null :( Should i keep the [ForeignKey()] stuff or should i use a different extension method?
Declare all classes with navigation properties to each other. Mark one of the tables (the dependent table) with the ForeignKey attribute on its Primary Key.
EF infers one-to-many from this:
public class OwnerDto
{
public int Id { get; set; }
public string Name { get; set; }
public string EmailAddress { get; set; }
public ICollection<ReviewDto> Reviewers{ get; set; }
public ICollection<SitterDto> Sitters{ get; set; }
}
public class SitterDto
{
public int Id { get; set; }
public string Name { get; set; }
public string EmailAddress { get; set; }
public int OwnerId{ get; set; }
[ForeignKey("OwnerId")]
public OwnerDto Owner { get; set; }
}
public class ReviewDto
{
public int Id { get; set; }
public int Rating { get; set; }
public int OwnerId{ get; set; }
[ForeignKey("OwnerId")]
public OwnerDto Owner { get; set; }
}
and EF infers one-to-one from this:
public class OwnerDto
{
...
public ReviewDto Review{ get; set; }
...
}
public class ReviewDto
{
[ForeignKey("Owner")]
public int OwnerId { get; set; }
public OwnerDto Owner{ get; set; }
...
}
You need to refer Eager Loading in this scenario, You can use the Include method to specify related data to be includethe d in query results.
var query = from review in context.Review.Include(o => o.Owner).Include(s=>s.Sitter) select review;
My EF Code First model for some reason is not in sync with the db. I'm getting this error:
{"Invalid column name 'Type_Id1'."}
The field is actually called 'Type_Id' so I'm not sure from where that 1 comes up. I have the table column called as Type_Id and also I've added a Type_Id in my type entity model.
Why might I be getting that error message, plus why I'm getting 1 at the end of the name?
Update
My Task class:
public class Task
{
public Task()
{
Language = 1;
Grades = new HashSet<Grade>();
Categories = new HashSet<Category>();
Subjects = new HashSet<Subject>();
Rooms = new Collection<Room>();
Tools = new Collection<Tool>();
}
[Key]
public int Id { get; set; }
public string Description { get; set; }
public virtual TaskType Type { get; set; }
public string Rules { get; set; }
[Required]
[StringLength(200), MinLength(1)]
public string Name { get; set; }
public int PreperationTime { get; set; }
public int InstructionTime { get; set; }
public int TaskTime { get; set; }
public int Type_Id { get; set; }
public string VideoLink { get; set; }
[Required]
public int Language { get; set; }
public int? MinimumParticipants { get; set; }
public int? MaximumParticipants { get; set; }
public int? Rating { get; set; }
[Required]
public string CreatedBy { get; set; }
public virtual ICollection<Grade> Grades { get; set; }
public virtual ICollection<Category> Categories { get; set; }
public virtual ICollection<Subject> Subjects { get; set; }
public virtual ICollection<Room> Rooms { get; set; }
public virtual ICollection<Tool> Tools { get; set; }
}
DBContext class:
public ApplicationDbContext() : base("DefaultConnection", false)
{
}
public DbSet<Task> Tasks { get; set; }
public DbSet<TaskType> TaskTypes { get; set; }
public static ApplicationDbContext Create()
{
return new ApplicationDbContext();
}
You need to add the FK attribute on your navigation property. EF is creating Type_Id1 because Type_Id already exists (although it can't tell by convention it is the FK).
[ForeignKey("Type_Id")]
public virtual TaskType Type { get; set; }
https://msdn.microsoft.com/en-us/data/jj591583.aspx#Relationships
I am in an MVC4 application and i am using EF CodeFirst.
When I try to run the following code:
public void Autorizare(int cerereId, Persoana persoana)
{
var cerere = _db.Cereri.Find(cerereId);
cerere.Autorizare.Add(persoana);
_db.SaveChanges();
}
I get an error like this:
Entities in 'CerereDbContext.Persoane' participate in the 'Actiune_Executanti' relationship. 0 related 'Actiune_Executanti_Source' were found. 1 'Actiune_Executanti_Source' is expected.
i have tried Entity(Actiune).State = EntityState.Modified, but no results.
I have a main POCO:
public class Cerere
{
public int Id { get; set; }
...
public virtual ICollection<Actiune> Actiuni { get; set; }
...
}
the Actiune class looks like this
public class Actiune
{
public int Id { get; set; }
public DateTime Data { get; set; }
public String Nume { get; set; }
public virtual ICollection<Persoana> Executanti { get; set; }
public String Stadiu { get; set; }
public String Obs { get; set; }
}
And Persoana:
public class Persoana
{
public int Id { get; set; }
public DateTime Data { get; set; }
public String Nume { get; set; }
}
From your model the Cerere does not have a property named Autorizare; however it does have one named Actiuni. Which is of type Actiune not Persoana which is what you are trying to add to it. Please post the rest of the Class Definition.