I have two Entities
public class Person
{
public virtual int ID { get; set; }
public virtual string Name { get; set; }
public virtual Employee Employee { get; set; }
}
public class Employee
{
public virtual int ID { get; set; }
public virtual string Code { get; set; }
public virtual int PersonId { get; set; }
[ForeignKey("PersonId")]
public virtual Person Person { get; set; }
}
in my business first we create person then we create an employee by selecting a person, while selecting person for the employee i want to select only the persons who are not associated to employee, i couldn't figure how to configure the Employee property in Person Entity
If you are selecting people that aren't related to a specific employee then you shouldn't have a property for that. You should only have link to related entities. Try doing this in LINQ it should get you all people that don't have a relation to an employee.
var people = context.People.Where(x => x.Employee == null);
public class Person
{
public virtual int ID { get; set; }
public virtual string Name { get; set; }
public virtual Employee Employee { get; set; }
}
public class Employee
{
public virtual int ID { get; set; }
public virtual string Code { get; set; }
public virtual int PersonId { get; set; }
[ForeignKey("PersonId")]
[InverseProperty("Employee")]
public virtual Person Person { get; set; }
}
Think that should do it, inverse property creates the mapping so only needs to be done from one side.
Hope this is what you were looking for.
I figured out an answer, don't know if it's the best!
jobQuery = jobQuery.Where(jb => !Context.Employees.Any(emp => emp.JobId == jb.Id));
Related
I have 3 tables (User, Tags, Book).
In the User table I have an attribute Interesting, it has a tag_id (I saving inside it a tagid). I also have a Tags table that has many tags with many to many to book table relation.
public class Tag
{
public virtual int Id { get; set; }
public virtual string Name { get; set; }
public virtual string UrlSlug { get; set; }
public virtual string Description { get; set; }
public virtual ICollection<Book> Books { get; set; }
}
and here is the book table :
public partial class Book
{
[Key]
public int Book_id { get; set; }
[Required]
[Display(Name ="User Name")]
[StringLength(128)]
public string User_ID { get; set; }
public virtual ICollection<Tag> Tags { get; set; }
public virtual AspNetUser AspNetUser { get; set; }
}
and here is the user table :
public partial class AspNetUser
{
public string Id { get; set; }
public string Email { get; set; }
public bool EmailConfirmed { get; set; }
public string PasswordHash { get; set; }
[Display(Name = "Interesting")]
public int Interesting { get; set; }
public virtual ICollection<Book> Books { get; set; }
}
What is the SQL statement here to retrieve the book that match the Interesting attribute?
For example in Interesting attribute I have 17 , so I want to retrieve the book that related to the tag id 17 ..
Note: my many-to-many table generated from the relation name is TagBooks
This should give you all the posts where it is associated with the "Swift" tag.
var books = dbContext.Books.Where(s => s.Tags.Any(f => f.Name == "Swift")).ToList();
If you want to get the result based on the TagId, change the condition in the predicate.
var books = dbContext.Books.Where(s => s.Tags.Any(f => f.Id== 17)).ToList();
I have 2 classes which have a many to many relation.
public class Document
{
public int Id { get; set; }
public string Name { get; set; }
public bool AvailableOffline { get; set; }
public string URL { get; set; }
public virtual ICollection<Profile> Profiles { get; set; }
}
public class Profile
{
public int Id { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public virtual ICollection<Document> Documents { get; set; }
}
On each profile I wish to have a SortOrder field for each document. So I made the joined table explicit in another class
public class ProfileDocuments
{
[Key, Column(Order = 0)]
public int DocumentId { get; set; }
[Key, Column(Order = 1)]
public int ProfileId { get; set; }
public int SortOrder { get; set; }
[ForeignKey("DocumentId")]
public virtual Document Document { get; set; }
[ForeignKey("ProfileId")]
public virtual Profile Profile { get; set; }
}
But when I update the database the table for this last class will not have a column for SortOrder. It only holds the 2 foreign keys. How can I tell EF to generate this table with my column?
When a junction table in a many-to-many association should contain more information than just the two foreign keys, it's no longer possible to map the association as a 'pure' many-to-many (with hidden junction class).
You need an explicit class in the class model to address the extra information (as you already found out), but this also changes the association into 1-n-1:
class Document
{
...
public virtual ICollection<ProfileDocument> ProfileDocuments { get; set; }
}
class Profile
{
...
public virtual ICollection<ProfileDocument> ProfileDocuments { get; set; }
}
In ASP.NET MVC 5 and EF6 Code First, i have a case in which a student can have one to many addresses. Now i want to use Student model in View to add both the record Student and Addresses of student. But the problem is i cant add addresses of student, is there any appropriate solution for this solution
Here is the example code
public class Student
{
public Student()
{ }
[Key]
public int StudentID { get; set; }
[Required]
public string Name { get; set; }
public virtual List<Address> Address { get; set; }
}
public class Address
{
public Address()
{
}
[Key]
public int AddressID { get; set; }
[ForeignKey("Student")]
public int StudentID { get; set; }
public string Address1 { get; set; }
public string Address2 { get; set; }
public string PostalCode { get; set; }
public string State { get; set; }
public string City { get; set; }
public string Country { get; set; }
public virtual Student Student { get; set; }
}
Make Listbox for address's and Pass with List that will be really help you and can you paste controller code here?
I have a Job table
public class Job
{
public int JobId { get; set; }
public int SalesManagerId { get; set; }
public int SalesRepId { get; set; }
}
and a Person table
public class Person
{
public int PersonId { get; set; }
public int FirstName { get; set; }
public int LastName { get; set; }
}
My question is, how do I link the SalesManagerId to the Person (or PersonId) as well as the SalesRepId to the Person (PersonId)? The Sales Manager and Sales Rep are independent of each other. I just don't want to make 2 different lists to support the Sales Manager and Sales Rep roles.
I'm new to MVC3, but it seems public virtual Person Person {get; set; } would be the way to go, but that doesn't work.
Any help would be appreciated!
Thanks!
Change your Job class like this
public class Job
{
public int JobId { get; set; }
public virtual Person SalesManager { set; get; }
public virtual Person SalesRep { set; get; }
}
This will create the Job table with 3 columns. JobId, SalesManager_PersonID (ForiegnKey) ,SalesRep_PersonID (Foriegn key)
I have the following model:
public class Member
{
public int Id { get; set; }
public string Username { get; set; }
public int MainEmailId { get; set; }
public virtual Email MainEmail { get; set; }
public virtual ICollection<Email> MemberEmails { get; set; }
}
public partial class Email
{
public Int32 Id { get; set; }
public String Email { get; set; }
public int MemberId { get; set; }
public virtual Member Member { get; set; }
}
As you can see I wish to create a:
one-to-one relation from the Member to MemberEmail (the main email address)
one-to-many relation from Member to MemberEmail
I know how to do this with Code First Fluent API. However I need to do it with DataAnnotations only. Is this possible?
Thanks a lot.