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);
}
下一步&GT; 软件包管理器控制台
PM> Add-Migration
cmdlet Add-Migration at command pipeline position 1
Supply values for the following parameters:
Name: MvcDbContext
错误:
在模型生成期间检测到一个或多个验证错误:
Borrowers_Book_Source ::多重性在角色中无效 &#39; Borrowers_Book_Source&#39;在关系&#39; Borrowers_Book&#39;。因为 依赖角色是指关键属性,即上界 依赖角色的多样性必须是&#39; 1&#39;。 请帮帮我?
答案 0 :(得分:0)
问题来自Visual Studio。 祝你好运。