多重度が

Question

役割コードファーストでは有効ではありませんBooks.cs

public class Books 
    { 
     public int BookId { get; set; } 
     public int AuthorId { get; set; } 
     public int CategoryId { get; set; } 
     public int PublishinHouseId { get; set; } 
     public string IsbnNo { get; set; } 
     public string BookName { get; set; } 
     public int NumberOfPages { get; set; } 
     public string Location { get; set; } 
     public virtual Authors Author { get; set; } 
     public virtual Categories Category { get; set; } 
     public virtual PublishingHouses PublishingHouse { get; set; } 

     public virtual ICollection<Borrowers> Borrowers { get; set; } 
    } 

Students.cs

public class Students 
    { 
     public int StudentId { get; set; } 
     public string FirstName { get; set; } 
     public string LastName { get; set; } 
     public int GenderId { get; set; } 
     public int DepartmentId { get; set; } 
     public DateTime DateOfBirth { get; set; } 
     public string Email { get; set; } 
     public string Phone { get; set; } 
     public string Address { get; set; } 
     public virtual Genders Gender { get; set; } 
     public virtual Departments Department { get; set; } 

     public virtual ICollection<Borrowers> Borrowers { get; set; } 
    } 

Borrowers.cs

public class Borrowers 
    { 
     public int BorrowerId { get; set; } 
     public int BookId { get; set; } 
     public int StudentId { get; set; } 
     public DateTime DateGiven { get; set; } 
     public DateTime DateReceived { get; set; } 
     public virtual Books Book { get; set; } 
     public virtual Students Student { get;set ;} 
    } 

BorrowerMap.cs

public BorrowerMap() 
     { 
      //Primary Key 
      this.HasKey(t => t.BorrowerId); 
      //Property 
      this.Property(t => t.BorrowerId).HasDatabaseGeneratedOption(DatabaseGeneratedOption.None); 
      this.Property(t => t.DateGiven).IsRequired().HasColumnType("Date"); 
      this.Property(t => t.DateReceived).IsRequired().HasColumnType("Date");   
      this.ToTable("Borrowers"); 
      this.Property(t => t.BorrowerId).HasColumnName("BorrowerId"); 
      this.Property(t => t.BookId).HasColumnName("BookId"); 
      this.Property(t => t.StudentId).HasColumnName("StudentId"); 
      this.Property(t => t.DateGiven).HasColumnName("DateGiven"); 
      this.Property(t => t.DateReceived).HasColumnName("DateReceived");    
      this.HasRequired(p => p.Book).WithMany(p => p.Borrowers).HasForeignKey(f => f.BorrowerId); 
      this.HasRequired(p => p.Student).WithMany(p => p.Borrowers).HasForeignKey(f => f.StudentId); 
     } 

次へ> パッケージマネージャコンソール

PM> Add-Migration 
cmdlet Add-Migration at command pipeline position 1 
Supply values for the following parameters: 
Name: MvcDbContext 

ERROR：

One or more validation errors were detected during model generation:

Borrowers_Book_Source: : Multiplicity is not valid in Role 'Borrowers_Book_Source' in relationship 'Borrowers_Book'. Because the Dependent Role refers to the key properties, the upper bound of the multiplicity of the Dependent Role must be '1'. Please help me?

Answer 1

問題は、Visual Studioからです。 で幸運。