Question

我无法让我的种子方法在alredy现有数据库上运行。该数据库是多次迁移的结果，我们使用ASP.NET MVC5身份数据库（我们称之为“IdentityDb”）迁移了我们自己创建的数据库“Whitelabel”。

以下是数据库表的概述：

enter image description here

由于这是代码优先的，我使用包管理器控制台使用以下命令更新数据库：

PM> update-database -ConfigurationTypeName DAL.DataContexts.WhitelabelMigrations.Configuration

它会触发错误“数据库中已存在名为'Adresses'的对象”。

这是WhitelabelDb上下文。

  using System.Data.Entity;
  using ClassLibrary.Entities;

  namespace DAL.DataContexts
  {
    public class WhitelabelDb : DbContext
  {
    public WhitelabelDb()
        : base("WhitelabelDb")
    {
    }

    public virtual DbSet<Category> CategorySet { get; set; }
    public virtual DbSet<Product> ProductSet { get; set; }
    public virtual DbSet<Stock> StockSet { get; set; }
    public virtual DbSet<Rating> RatingSet { get; set; }
    public virtual DbSet<Discount> DiscountSet { get; set; }
    public virtual DbSet<LineItem> LineItemSet { get; set; }
    public virtual DbSet<ShoppingCart> ShoppingCartSet { get; set; }
    public virtual DbSet<Invoice> InvoiceSet { get; set; }
    public virtual DbSet<Customer> CustomerSet { get; set; }
    public virtual DbSet<Adress> AdressSet { get; set; }


    }
  }


 }

这是IdentityDb背景：

using ClassLibrary.Entities;
using Microsoft.AspNet.Identity.EntityFramework;

namespace DAL.DataContexts
{
public class IdentityDb : IdentityDbContext<ApplicationUser>
{
    public IdentityDb()
        : base("WhitelabelDb")
    {
    }  

}
}

这是WhitelabelMigrations的configuration.cs文件：

using System.Data.Entity.Migrations;
using System;
using System.Collections.ObjectModel;
using System.Data.Entity.Migrations;
using System.Linq;
using ClassLibrary.Entities;


namespace DAL.DataContexts.WhitelabelMigrations
{
internal sealed class Configuration : DbMigrationsConfiguration<WhitelabelDb>
{

    public Configuration()
    {
        AutomaticMigrationsEnabled = true;
        MigrationsDirectory = @"DataContexts\WhitelabelMigrations";
    }

    protected override void Seed(WhitelabelDb context)
    {
        **//This is the seed method I want to run when I update the database:**
        if(!context.CategorySet.Any(c => c.Name == "Root"))
        {
            Category mainCategory = new Category { Id = Guid.NewGuid(), Name = "Root", Parent = null };
            context.CategorySet.Add(mainCategory);
            context.SaveChanges();
        }

    }
   }
  }

Whitelabel-Migrations的InitialCreate.cs文件使用System.Data.Entity.Migrations;

  namespace DAL.DataContexts.WhitelabelMigrations
 {
  public partial class InitialCreate : DbMigration
  {
    public override void Up()
    {
        CreateTable(
            "dbo.Adresses",
            c => new
            {
                Id = c.Guid(false),
                Street = c.String(),
                ZipCode = c.Int(false),
                City = c.String(),
                Country = c.String(),
                IsShippingAdress = c.Boolean(false),
                Customer_Id = c.Guid(),
            })
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.Customers", t => t.Customer_Id)
            .Index(t => t.Customer_Id);

        CreateTable(
            "dbo.Customers",
            c => new
            {
                Id = c.Guid(false),
                FirstName = c.String(),
                LastName = c.String(),
                Email = c.String(),
            })
            .PrimaryKey(t => t.Id);

        CreateTable(
            "dbo.Invoices",
            c => new
            {
                Id = c.Guid(false),
                DueDate = c.DateTime(false),
                InvoiceDate = c.DateTime(false),
                Customer_Id = c.Guid(),
                ShoppingCart_Id = c.Guid(),
            })
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.Customers", t => t.Customer_Id)
            .ForeignKey("dbo.ShoppingCarts", t => t.ShoppingCart_Id)
            .Index(t => t.Customer_Id)
            .Index(t => t.ShoppingCart_Id);

        CreateTable(
            "dbo.ShoppingCarts",
            c => new
            {
                Id = c.Guid(false),
                Quantity = c.String(),
                Status = c.String(),
                IsPaid = c.Boolean(false),
            })
            .PrimaryKey(t => t.Id);

        CreateTable(
            "dbo.LineItems",
            c => new
            {
                Id = c.Guid(false),
                Quantity = c.Int(false),
                ProductId = c.Guid(),
                ShoppingCart_Id = c.Guid(),
            })
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.Products", t => t.ProductId)
            .ForeignKey("dbo.ShoppingCarts", t => t.ShoppingCart_Id)
            .Index(t => t.ProductId)
            .Index(t => t.ShoppingCart_Id);

        CreateTable(
            "dbo.Products",
            c => new
            {
                Id = c.Guid(false),
                Name = c.String(),
                Description = c.String(),
                Price = c.Decimal(false, 18, 2),
                Status = c.String(),
                RekeaseDate = c.DateTime(),
                Weight = c.Double(),
                Category_Id = c.Guid(),
                Discount_Id = c.Guid(),
                Stock_Id = c.Guid(),
            })
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.Categories", t => t.Category_Id)
            .ForeignKey("dbo.Discounts", t => t.Discount_Id)
            .ForeignKey("dbo.Stocks", t => t.Stock_Id)
            .Index(t => t.Category_Id)
            .Index(t => t.Discount_Id)
            .Index(t => t.Stock_Id);

        CreateTable(
            "dbo.Categories",
            c => new
            {
                Id = c.Guid(false),
                Name = c.String(),
                Parent = c.Guid(),
            })
            .PrimaryKey(t => t.Id);

        CreateTable(
            "dbo.Attributes",
            c => new
            {
                Id = c.Guid(false),
                Name = c.String(),
                Category_Id = c.Guid(),
            })
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.Categories", t => t.Category_Id)
            .Index(t => t.Category_Id);

        CreateTable(
            "dbo.Discounts",
            c => new
            {
                Id = c.Guid(false),
                Price = c.Decimal(precision: 18, scale: 2),
                StartDate = c.DateTime(),
                EndDate = c.DateTime(),
            })
            .PrimaryKey(t => t.Id);

        CreateTable(
            "dbo.Ratings",
            c => new
            {
                Id = c.Guid(false),
                Rate = c.Int(),
                Comment = c.String(),
                Product_Id = c.Guid(),
            })
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.Products", t => t.Product_Id)
            .Index(t => t.Product_Id);

        CreateTable(
            "dbo.Stocks",
            c => new
            {
                Id = c.Guid(false),
                Quantity = c.Int(),
                DeliveryDate = c.DateTime(),
            })
            .PrimaryKey(t => t.Id);
    }

    public override void Down()
    {
        DropForeignKey("dbo.Invoices", "ShoppingCart_Id", "dbo.ShoppingCarts");
        DropForeignKey("dbo.LineItems", "ShoppingCart_Id", "dbo.ShoppingCarts");
        DropForeignKey("dbo.LineItems", "ProductId", "dbo.Products");
        DropForeignKey("dbo.Products", "Stock_Id", "dbo.Stocks");
        DropForeignKey("dbo.Ratings", "Product_Id", "dbo.Products");
        DropForeignKey("dbo.Products", "Discount_Id", "dbo.Discounts");
        DropForeignKey("dbo.Products", "Category_Id", "dbo.Categories");
        DropForeignKey("dbo.Attributes", "Category_Id", "dbo.Categories");
        DropForeignKey("dbo.Invoices", "Customer_Id", "dbo.Customers");
        DropForeignKey("dbo.Adresses", "Customer_Id", "dbo.Customers");
        DropIndex("dbo.Invoices", new[] {"ShoppingCart_Id"});
        DropIndex("dbo.LineItems", new[] {"ShoppingCart_Id"});
        DropIndex("dbo.LineItems", new[] {"ProductId"});
        DropIndex("dbo.Products", new[] {"Stock_Id"});
        DropIndex("dbo.Ratings", new[] {"Product_Id"});
        DropIndex("dbo.Products", new[] {"Discount_Id"});
        DropIndex("dbo.Products", new[] {"Category_Id"});
        DropIndex("dbo.Attributes", new[] {"Category_Id"});
        DropIndex("dbo.Invoices", new[] {"Customer_Id"});
        DropIndex("dbo.Adresses", new[] {"Customer_Id"});
        DropTable("dbo.Stocks");
        DropTable("dbo.Ratings");
        DropTable("dbo.Discounts");
        DropTable("dbo.Attributes");
        DropTable("dbo.Categories");
        DropTable("dbo.Products");
        DropTable("dbo.LineItems");
        DropTable("dbo.ShoppingCarts");
        DropTable("dbo.Invoices");
        DropTable("dbo.Customers");
        DropTable("dbo.Adresses");
    }
   }
   }

当然还有Identity-Migrations InitialCreate.cs

using System.Data.Entity.Migrations;

    namespace DAL.DataContexts.IdentityMigrations
    {
    public partial class InitialCreate : DbMigration
    {
    public override void Up()
    {
        CreateTable(
            "dbo.AspNetRoles",
            c => new
            {
                Id = c.String(false, 128),
                Name = c.String(false),
            })
            .PrimaryKey(t => t.Id);

        CreateTable(
            "dbo.AspNetUsers",
            c => new
            {
                Id = c.String(false, 128),
                UserName = c.String(),
                PasswordHash = c.String(),
                SecurityStamp = c.String(),
                Discriminator = c.String(false, 128),
                Customer_Id = c.Guid(),
            })
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.Customers", t => t.Customer_Id)
            .Index(t => t.Customer_Id);

        CreateTable(
            "dbo.AspNetUserClaims",
            c => new
            {
                Id = c.Int(false, true),
                ClaimType = c.String(),
                ClaimValue = c.String(),
                User_Id = c.String(false, 128),
            })
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.AspNetUsers", t => t.User_Id, true)
            .Index(t => t.User_Id);

        CreateTable(
            "dbo.AspNetUserLogins",
            c => new
            {
                UserId = c.String(false, 128),
                LoginProvider = c.String(false, 128),
                ProviderKey = c.String(false, 128),
            })
            .PrimaryKey(t => new {t.UserId, t.LoginProvider, t.ProviderKey})
            .ForeignKey("dbo.AspNetUsers", t => t.UserId, true)
            .Index(t => t.UserId);

        CreateTable(
            "dbo.AspNetUserRoles",
            c => new
            {
                UserId = c.String(false, 128),
                RoleId = c.String(false, 128),
            })
            .PrimaryKey(t => new {t.UserId, t.RoleId})
            .ForeignKey("dbo.AspNetRoles", t => t.RoleId, true)
            .ForeignKey("dbo.AspNetUsers", t => t.UserId, true)
            .Index(t => t.RoleId)
            .Index(t => t.UserId);

        CreateTable(
            "dbo.Customers",
            c => new
            {
                Id = c.Guid(false),
                FirstName = c.String(),
                LastName = c.String(),
                Email = c.String(),
            })
            .PrimaryKey(t => t.Id);

        CreateTable(
            "dbo.Adresses",
            c => new
            {
                Id = c.Guid(false),
                Street = c.String(),
                ZipCode = c.Int(false),
                City = c.String(),
                Country = c.String(),
                IsShippingAdress = c.Boolean(false),
                Customer_Id = c.Guid(),
            })
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.Customers", t => t.Customer_Id)
            .Index(t => t.Customer_Id);

        CreateTable(
            "dbo.Invoices",
            c => new
            {
                Id = c.Guid(false),
                DueDate = c.DateTime(false),
                InvoiceDate = c.DateTime(false),
                Customer_Id = c.Guid(),
                ShoppingCart_Id = c.Guid(),
            })
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.Customers", t => t.Customer_Id)
            .ForeignKey("dbo.ShoppingCarts", t => t.ShoppingCart_Id)
            .Index(t => t.Customer_Id)
            .Index(t => t.ShoppingCart_Id);

        CreateTable(
            "dbo.ShoppingCarts",
            c => new
            {
                Id = c.Guid(false),
                Quantity = c.String(),
                Status = c.String(),
                IsPaid = c.Boolean(false),
            })
            .PrimaryKey(t => t.Id);

        CreateTable(
            "dbo.LineItems",
            c => new
            {
                Id = c.Guid(false),
                Quantity = c.Int(false),
                ProductId = c.Guid(),
                ShoppingCart_Id = c.Guid(),
            })
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.Products", t => t.ProductId)
            .ForeignKey("dbo.ShoppingCarts", t => t.ShoppingCart_Id)
            .Index(t => t.ProductId)
            .Index(t => t.ShoppingCart_Id);

        CreateTable(
            "dbo.Products",
            c => new
            {
                Id = c.Guid(false),
                Name = c.String(),
                Description = c.String(),
                Price = c.Decimal(false, 18, 2),
                Status = c.String(),
                RekeaseDate = c.DateTime(),
                Weight = c.Double(),
                Category_Id = c.Guid(),
                Discount_Id = c.Guid(),
                Stock_Id = c.Guid(),
            })
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.Categories", t => t.Category_Id)
            .ForeignKey("dbo.Discounts", t => t.Discount_Id)
            .ForeignKey("dbo.Stocks", t => t.Stock_Id)
            .Index(t => t.Category_Id)
            .Index(t => t.Discount_Id)
            .Index(t => t.Stock_Id);

        CreateTable(
            "dbo.Categories",
            c => new
            {
                Id = c.Guid(false),
                Name = c.String(),
                Parent = c.Guid(),
            })
            .PrimaryKey(t => t.Id);

        CreateTable(
            "dbo.Attributes",
            c => new
            {
                Id = c.Guid(false),
                Name = c.String(),
                Category_Id = c.Guid(),
            })
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.Categories", t => t.Category_Id)
            .Index(t => t.Category_Id);

        CreateTable(
            "dbo.Discounts",
            c => new
            {
                Id = c.Guid(false),
                Price = c.Decimal(precision: 18, scale: 2),
                StartDate = c.DateTime(),
                EndDate = c.DateTime(),
            })
            .PrimaryKey(t => t.Id);

        CreateTable(
            "dbo.Ratings",
            c => new
            {
                Id = c.Guid(false),
                Rate = c.Int(),
                Comment = c.String(),
                Product_Id = c.Guid(),
            })
            .PrimaryKey(t => t.Id)
            .ForeignKey("dbo.Products", t => t.Product_Id)
            .Index(t => t.Product_Id);

        CreateTable(
            "dbo.Stocks",
            c => new
            {
                Id = c.Guid(false),
                Quantity = c.Int(),
                DeliveryDate = c.DateTime(),
            })
            .PrimaryKey(t => t.Id);
    }

    public override void Down()
    {
        DropForeignKey("dbo.AspNetUsers", "Customer_Id", "dbo.Customers");
        DropForeignKey("dbo.Invoices", "ShoppingCart_Id", "dbo.ShoppingCarts");
        DropForeignKey("dbo.LineItems", "ShoppingCart_Id", "dbo.ShoppingCarts");
        DropForeignKey("dbo.LineItems", "ProductId", "dbo.Products");
        DropForeignKey("dbo.Products", "Stock_Id", "dbo.Stocks");
        DropForeignKey("dbo.Ratings", "Product_Id", "dbo.Products");
        DropForeignKey("dbo.Products", "Discount_Id", "dbo.Discounts");
        DropForeignKey("dbo.Products", "Category_Id", "dbo.Categories");
        DropForeignKey("dbo.Attributes", "Category_Id", "dbo.Categories");
        DropForeignKey("dbo.Invoices", "Customer_Id", "dbo.Customers");
        DropForeignKey("dbo.Adresses", "Customer_Id", "dbo.Customers");
        DropForeignKey("dbo.AspNetUserClaims", "User_Id", "dbo.AspNetUsers");
        DropForeignKey("dbo.AspNetUserRoles", "UserId", "dbo.AspNetUsers");
        DropForeignKey("dbo.AspNetUserRoles", "RoleId", "dbo.AspNetRoles");
        DropForeignKey("dbo.AspNetUserLogins", "UserId", "dbo.AspNetUsers");
        DropIndex("dbo.AspNetUsers", new[] {"Customer_Id"});
        DropIndex("dbo.Invoices", new[] {"ShoppingCart_Id"});
        DropIndex("dbo.LineItems", new[] {"ShoppingCart_Id"});
        DropIndex("dbo.LineItems", new[] {"ProductId"});
        DropIndex("dbo.Products", new[] {"Stock_Id"});
        DropIndex("dbo.Ratings", new[] {"Product_Id"});
        DropIndex("dbo.Products", new[] {"Discount_Id"});
        DropIndex("dbo.Products", new[] {"Category_Id"});
        DropIndex("dbo.Attributes", new[] {"Category_Id"});
        DropIndex("dbo.Invoices", new[] {"Customer_Id"});
        DropIndex("dbo.Adresses", new[] {"Customer_Id"});
        DropIndex("dbo.AspNetUserClaims", new[] {"User_Id"});
        DropIndex("dbo.AspNetUserRoles", new[] {"UserId"});
        DropIndex("dbo.AspNetUserRoles", new[] {"RoleId"});
        DropIndex("dbo.AspNetUserLogins", new[] {"UserId"});
        DropTable("dbo.Stocks");
        DropTable("dbo.Ratings");
        DropTable("dbo.Discounts");
        DropTable("dbo.Attributes");
        DropTable("dbo.Categories");
        DropTable("dbo.Products");
        DropTable("dbo.LineItems");
        DropTable("dbo.ShoppingCarts");
        DropTable("dbo.Invoices");
        DropTable("dbo.Adresses");
        DropTable("dbo.Customers");
        DropTable("dbo.AspNetUserRoles");
        DropTable("dbo.AspNetUserLogins");
        DropTable("dbo.AspNetUserClaims");
        DropTable("dbo.AspNetUsers");
        DropTable("dbo.AspNetRoles");
    }
   }
 }

那么，我怎样才能运行种子方法，因为我只能从Whitelabel configuration.cs文件中访问Category类？

非常感谢任何解释，想法和建设性的帮助！

Answer 1

实际上，我所要做的就是在IdentityDb中添加这一行：

public virtual DbSet<Category> CategorySet { get; set; }

我可以访问IdentityMigrations configuration.cs中的Category类，并按照我想要的方式创建Seed方法。

protected override void Seed(IdentityDb context)
{
    **//This is the seed method I want to run when I update the database:**
    if(!context.CategorySet.Any(c => c.Name == "Root"))
    {
        Category mainCategory = new Category { Id = Guid.NewGuid(), Name = "Root",   Parent = null };
        context.CategorySet.Add(mainCategory);
        context.SaveChanges();
    }

}

update-database fires：＆＃34;已有一个名为＆＃39; Adresses＆＃39;在数据库＆＃34;。

1 个答案: