Asp核心多個實體關係

Question

我正在建模聯繫人信息結構，並沒有完全弄清楚如何使用EF Core編碼關係。我對使用EF進行數據訪問層相當新穎。

我想要一個可以包含網站，電話號碼，電子郵件或社交信息的聯繫人模式。然後聯繫信息將被添加到幾個不同的模型。任何建議都會有所幫助，我不知道如何使用許多表關係來編碼這個One to many，或者甚至可以使用EF。

模型到目前爲止

public class Contact 
{ 
    public String Id { get; set; } 
    public Int32 ContactType { get; set; } //Enum for Website, Phonenumbers, Emails, or Social 
    public String RecId { get; set; } //FK to multiple Models 
    public String RecType { get; set; }//Value for which model the RecID is for 
    public String Name { get; set; } 
    public String Value { get; set; } 
} 

public class ContactInfo 
{ 
    public virtual IList<Contact> Website { get; set; } 
    public virtual IList<Contact> PhoneNumbers { get; set; } 
    public virtual IList<Contact> Emails { get; set; } 
    public virtual IList<Contact> Socials { get; set; } 
} 
//Example of models to use the contact model 
public class Company 
{ 
    .... 
    pubic ContactInfo ContactInfo { get; set;} 
} 
public class Client 
{ 
    .... 
    pubic ContactInfo ContactInfo { get; set;} 
} 

Answer 1

如果我正確理解你的問題，那麼你可以使用下面的代碼示例，但它不是你想實現什麼。這可能會讓你瞭解你需要用EF做些什麼。

public class Contact 
    { 
     public String Id { get; set; } 
     public ContactType ContactType { get; set; } //Enum for Website, Phonenumbers, Emails, or Social 
     public String RecId { get; set; } //FK to multiple Models (This can't be the FK to multiple table as it should be FK for one table so that FK for Company would be CompanyId, FK for the Client should ClientId) 
     public String RecType { get; set; }//Value for which model the RecID is for (This need to rethink as it may not needed.) 
     public String Name { get; set; } 
     public String Value { get; set; } 

     // One to Many Relationship 

     public string CompanyId? { get; set; } 
     public string ClientId? { get; set; } 

     public Company Company { get; set; } 
     public Client Client { get; set; } 
    } 

    public class Company 
    { 
     public String Id { get; set; } 
     // Other properties 

     // One to Many Relationship 
     public ICollection<Contact> Contacts { get; set; } 
    } 

    public class Client 
    { 
     public String Id { get; set; } 
     // Other properties 

     // One to Many Relationship 
     public ICollection<Contact> Contacts { get; set; } 
    } 


    /* Db context */ 

    public class YourDbContext : DbContext 
    { 
     public YourDbContext(DbContextOptions<YourDbContext> options) 
      : base(options) 
     { 

     } 

     public virtual DbSet<Contact> Contacts { get; set; } 

     public virtual DbSet<Company> Companies { get; set; } 

     public virtual DbSet<Client> Clients { get; set; } 



     protected override void OnModelCreating(ModelBuilder modelBuilder) 
     { 
      base.OnModelCreating(modelBuilder); 

      modelBuilder.Entity<Contact>().HasKey(t => t.Id); 

      modelBuilder.Entity<Company>().HasKey(t => t.Id); 
      modelBuilder.Entity<Company>().HasMany(c => c.Contacts).WithOne(c => c.Company).HasForeignKey(k => k.CompanyId); 

      modelBuilder.Entity<Client>().HasKey(t => t.Id); 
      modelBuilder.Entity<Client>().HasMany(t => t.Contacts).WithOne(c =>c.Client).HasForeignKey(k => k.ClientId); 

     } 
    } 

    /* Db context - Endd */ 


    public enum ContactType 
    { 
     Website, 
     PhoneNumbers, 
     Emails, 
     Social 
    } 

讓我知道你是否需要任何信息。

Answer 2

在DSR的幫助下，這是我的解決方案（未經測試）。

public class Company 
{ 
    public String Id { get; set; } 
    public String Name { get; set; } 

    public ICollection<ContactPhone> PhoneNumbers { get; set; } 
    public ICollection<ContactEmail> ContactEmail { get; set; } 
    public ICollection<ContactWebsite> ContactWebsite { get; set; } 
    public ICollection<ContactSocial> ContactSocial { get; set; } 

} 
public class Client 
{ 
    public String Id { get; set; } 
    public String Name { get; set; } 

    public ICollection<ContactPhone> PhoneNumbers { get; set; } 
    public ICollection<ContactEmail> ContactEmail { get; set; } 
    public ICollection<ContactWebsite> ContactWebsite { get; set; } 
    public ICollection<ContactSocial> ContactSocial { get; set; } 
} 
public class ContactWebsite 
{ 
    public String Id { get; set; } 
    public String Url { get; set; } 

    public Company Company { get; set; } 
    public Client Client { get; set; } 
} 
public class ContactPhone 
{ 
    public String Id { get; set; } 
    public String Type { get; set; } 
    public String Number { get; set; } 

    public Company Company { get; set; } 
    public Client Client { get; set; } 
} 
public class ContactEmail 
{ 
    public String Id { get; set; } 
    public String Category { get; set; } 
    public String Email { get; set; } 

    public Company Company { get; set; } 
    public Client Client { get; set; } 
} 
public class ContactSocial 
{ 
    public String Id { get; set; } 
    public String Site { get; set; } 
    public String Handle { get; set; } 

    public Company Company { get; set; } 
    public Client Client { get; set; } 
}