Join two tables in EntityFramework - mysql

Question

I have two tables:
Companies
Contacts with a one-to-many relations (many contacts in one Company)
Contacts table EDITED:
public class Contact
{
public Guid Id { get; set; }
public DateTime dateCreated { get; set; }
public DateTime updated { get; set; }
public Boolean hidden { get; set; }
//Personal Data
public string title { get; set; }
public string jobTitle { get; set; }
public string firstName { get; set; }
public string lastName { get; set; }
public string department { get; set; }
public string email { get; set; }
public string logoUrl { get; set; }
public string personalRemarks { get; set; }
//Telephone list
public ICollection<Phone> Phones { get; set; }
//Addresses
public ICollection<Address> Addresses { get; set; }
//Bank Data
public ICollection<Bankdata> Bankdatas { get; set; }
//Tags
public ICollection<Tag> Tags { get; set; }
}
}
Companies table EDITED:
public class Organization
{
public Guid Id { get; set; }
public DateTime dateCreated { get; set; }
public DateTime dateUpdated { get; set; }
public Boolean hidden { get; set; }
//Company Data
public string organizationName { get; set; }
public string taxId { get; set; }
public string trades { get; set; }
public string organizationType { get; set; }
public string actionRadius { get; set; }
public string organizationRemarks { get; set; }
public string web { get; set; }
//Contacts
public ICollection<Contact> Contacts { get; set; }
//Tags
public ICollection<Tag> Tags { get; set; }
}
}
I have a method im my repository to select all the contacts in one company
public Organization GetOrganizationById(Guid Id)
{
return _context.Organizations
.Include(c => c.Contacts)
.Where(c => c.Id == Id)
.FirstOrDefault();
}
But since all I have is the company id I need to make a join between the two tables in order to get the name. Something like:
SELECT contacts,*, Organization.name
FROM contacts
INNER JOIN Organization ON Organization.id = Contacts.organization_id
WHERE Organization.id = id;
I have tried the following without success:
public Organization GetOrganizationById(Guid Id)
{
return _context.Organizations
.Include(o => o.organizationName)
.Include(c => c.Contacts)
.Where(c => c.Id == Id)
.FirstOrDefault();
}
Any help will be welcome

Answer 1

The right approach is to create a navigation property between the Organization class and the Contact class. The following code will let you understand the steps you need to do:
public class Contact
{
...
// Foreign key for Organization
public Guid OrganizationId { get; set; }
// Related Organization entity
[ForeignKey("OrganizationId ")]
public Organization Standard { get; set; }
}
public class Organization
{
...
// List of related Contacts
public virtual ICollection<Contact> Contacts { get; set; }
}
After creating a migration with this code you will implement your method as follows:
public Organization GetOrganizationById(Guid Id)
{
return _context.Organizations
.Include(c => c.Contacts)
.Where(c => c.Id == Id)
.FirstOrDefault();
}