C#•3y ago

DBFirst one to one or zero

I have One Patient to One or No MedicalCard associated with him EF Generated the following code:

public Patient(){
    {
        Appointments = new HashSet<Appointment>();
        MedicalCards = new HashSet<MedicalCard>();
    }

public int Id { get; set; }
public string? Lastname { get; set; }
public string? Firstname { get; set; }
public string? Middlename { get; set; }
public string? Phone { get; set; }
public string? Address { get; set; }
public bool? Gender { get; set; }
public int? Medcard { get; set; }

public virtual MedicalCard? MedcardNavigation { get; set; }
public virtual ICollection<Appointment> Appointments { get; set; }
public virtual ICollection<MedicalCard> MedicalCards { get; set; }

public partial class MedicalCard
{
    public MedicalCard()
    {
        MedicalReports = new HashSet<MedicalReport>();
        Patients = new HashSet<Patient>();
    }
public int Id { get; set; }
public int Patient { get; set; }
public DateTime? Issued { get; set; }

public virtual Patient PatientNavigation { get; set; } = null!;
public virtual ICollection<MedicalReport> MedicalReports { get; set; }
public virtual ICollection<Patient> Patients { get; set; }
}

public Patient(){
    {
        Appointments = new HashSet<Appointment>();
        MedicalCards = new HashSet<MedicalCard>();
    }

public int Id { get; set; }
public string? Lastname { get; set; }
public string? Firstname { get; set; }
public string? Middlename { get; set; }
public string? Phone { get; set; }
public string? Address { get; set; }
public bool? Gender { get; set; }
public int? Medcard { get; set; }

public virtual MedicalCard? MedcardNavigation { get; set; }
public virtual ICollection<Appointment> Appointments { get; set; }
public virtual ICollection<MedicalCard> MedicalCards { get; set; }

public partial class MedicalCard
{
    public MedicalCard()
    {
        MedicalReports = new HashSet<MedicalReport>();
        Patients = new HashSet<Patient>();
    }
public int Id { get; set; }
public int Patient { get; set; }
public DateTime? Issued { get; set; }

public virtual Patient PatientNavigation { get; set; } = null!;
public virtual ICollection<MedicalReport> MedicalReports { get; set; }
public virtual ICollection<Patient> Patients { get; set; }
}

Why did it create Collections? What's the use of them? I have id and single entity navigation property, but why the collections?

6 Replies

Unknown User•3y ago

Message Not Public

Angius•3y ago

Ooof ouch owie db-first

bookuhaOP•3y ago

should i rewrite it to code first? what would be the fastest way?

Unknown User•3y ago

Message Not Public

Angius•3y ago

Code-first is definitely easier to deal with IME

bookuhaOP•3y ago

i dont really care about the data, just want my services to keep up well with new code first entities like, i dont use these collections anywhere anyway so i just need to drop the db, clear migrations, remove redundant fields, specify correct one to one...zero and i hope it will work fine

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DBFirst one to one or zero