Я пытаюсь добавить миграции, но я получаю сообщение об ошибке, как я могу решить эту проблему

В моем каталоге моделей у меня есть следующий кодЯ пытаюсь добавить миграции, но я получаю сообщение об ошибке, как я могу решить эту проблему

public class Post 
{ 
    // Each post will have an ID 
    public string Id { get; set; } 

    // Each Post must have a title 
    [Required] 
    [StringLength(50, ErrorMessage = "The {0} must be between {2} and {1} characters long.", MinimumLength = 5)] 
    [Display(Name = "Title")] 
    public string Title { get; set; } 

    // Each Post must have a short description 
    [Required] 
    [StringLength(250, ErrorMessage = "The {0} must be between {2} and {1} characters long.", MinimumLength = 20)] 
    [Display(Name = "Short Description")] 
    public string ShortDescription { get; set; } 

    // Each Post must have a body 
    [Required] 
    [StringLength(5000, ErrorMessage = "The {0} must be between {2} and {1} characters long.", MinimumLength = 500)] 
    [Display(Name = "Body")] 
    public string Body { get; set; } 

    // Each Post must have meta description to use in the meta tag 
    [Required] 
    [StringLength(25, ErrorMessage = "The {0} must be between {2} and {1} characters long.", MinimumLength = 5)] 
    [Display(Name = "Meta")] 
    public string Meta { get; set; } 

    // User friendly urls 
    [Required] 
    [Display(Name = "UrlSeo")] 
    public string UrlSeo { get; set; } 

    // A boolean to check if the post has been published 
    public bool Published { get; set; } 

    [DefaultValue(0)] 
    // Count of how many likes the post has 
    public int NetLikeCount { get; set; } 

    //DateTime when it was created 
    public DateTime PostedOn { get; set; } 

    //DateTime when it was modified 
    public DateTime? Modified { get; set; } 

    //Properties which define relationships between tables 
    public ICollection<Comment> Comments { get; set; } 
    public ICollection<Reply> Replies { get; set; } 
    public ICollection<PostCategory> PostCategories { get; set; } 
    public ICollection<PostTag> PostTags { get; set; } 
    public ICollection<PostVideo> PostVideos { get; set; } 
    public ICollection<PostLike> PostLikes { get; set; } 
} 
public class Comment 
{ 
    public string Id { get; set; } 

    public string PostId { get; set; } 

    public DateTime DateTime { get; set; } 

    public string UserName { get; set; } 

    [Required] 
    [StringLength(1000, ErrorMessage = "The {0} must be between {2} and {1} characters long.", MinimumLength = 25)] 
    [Display(Name = "Body")] 
    public string Body { get; set; } 

    [DefaultValue(0)] 
    public int NetLikeCount { get; set; } 

    [DefaultValue(false)] 
    public bool Deleted { get; set; } 

    public Post Post { get; set; } 
    public ICollection<Reply> Replies { get; set; } 
    public ICollection<CommentLike> CommentLikes { get; set; } 
} 
public class Reply 
{ 
    public string Id { get; set; } 

    public string PostId { get; set; } 

    public string CommentId { get; set; } 

    public string ParentReplyId { get; set; } 

    public DateTime DateTime { get; set; } 

    public string UserName { get; set; } 

    [Required] 
    [StringLength(1000, ErrorMessage = "The {0} must be between {2} and {1} characters long.", MinimumLength = 25)] 
    [Display(Name = "Body")] 
    public string Body { get; set; } 

    public bool Deleted { get; set; } 

    public Post Post { get; set; } 
    public Comment Comment { get; set; } 
    public ICollection<ReplyLike> ReplyLikes { get; set; } 
} 
public class PostCategory 
{ 
    [Key] 
    [Column(Order = 0)] 
    public string PostId { get; set; } 

    [Key] 
    [Column(Order = 1)] 
    public string CategoryId { get; set; } 

    public bool Checked { get; set; } 

    public Post Post { get; set; } 

    public Category Category { get; set; } 
} 
public class PostTag 
{ 
    [Key] 
    [Column(Order = 0)] 
    public string PostId { get; set; } 

    [Key] 
    [Column(Order = 1)] 
    public string TagId { get; set; } 

    public bool Checked { get; set; } 

    public Post Post { get; set; } 
    public Tag Tag { get; set; } 
} 
public class PostVideo 
{ 
    public string Id { get; set; } 

    [Required] 
    [Display(Name = "VideoUrl")] 
    [DataType(DataType.Url)] 
    public string VideoUrl { get; set; } 

    public string VideoThumbnail { get; set; } 

    public string PostId { get; set; } 

    public string VideoSiteName { get; set; } 

    public Post Post { get; set; } 
} 
public class PostLike 
{ 
    [Key] 
    public string PostId { get; set; } 

    public string UserName { get; set; } 

    public bool Like { get; set; } 

    public bool DisLike { get; set; } 

    public Post Post { get; set; } 
} 
public class Category 
{ 
    public string Id { get; set; } 

    [Required] 
    [Display(Name = "Name")] 
    public string Name { get; set; } 

    [Required] 
    [Display(Name = "UrlSeo")] 
    public string UrlSeo { get; set; } 

    [Required] 
    [StringLength(20, ErrorMessage = "The {0} must be between {2} and {1} characters long.", MinimumLength = 5)] 
    [Display(Name = "Description")] 
    public string Description { get; set; } 

    public bool Checked { get; set; } 

    public ICollection<PostCategory> PostCategories { get; set; } 
} 
public class CommentLike 
{ 
    [Key] 
    public string CommentId { get; set; } 

    public string UserName { get; set; } 

    public bool Like { get; set; } 

    public bool DisLike { get; set; } 

    public Comment Comment { get; set; } 
} 
public class ReplyLike 
{ 
    [Key] 
    public string ReplyId { get; set; } 

    public string UserName { get; set; } 

    public bool Like { get; set; } 

    public bool DisLike { get; set; } 

    public Reply Reply { get; set; } 
} 
public class Tag 
{ 
    public string Id { get; set; } 

    [Required] 
    [Display(Name = "Name")] 
    public string Name { get; set; } 

    [Required] 
    [StringLength(20, ErrorMessage = "The {0} must be between {2} and {1} characters long.", MinimumLength = 5)] 
    [Display(Name = "UrlSeo")] 
    public string UrlSeo { get; set; } 

    public bool Checked { get; set; } 

    public ICollection<PostTag> PostTags { get; set; } 
}

Итак, это схема моих данных я пытаюсь добавить миграции

Когда я пытаюсь добавить эту миграцию, он сообщает мне, что для типа сущности 'Blog.Models.PostCategory' требуется ключ. Как я могу решить эту ошибку

источник

2016-09-13 Phathutshedzo Khabubu

Я попробовал ваш код и он работал отлично, может вы также показываете классы Category и Post? – Ziyad

@ Ziyad Я не уверен, что вы сможете это увидеть. public class Категория { public string Id {get; задавать; } [Обязательно] [Показать (с именем = "Имя")] public string Имя {get; задавать; } [Обязательно] [Показать (сгенерировано = "UrlSeo")] public string UrlSeo {get; задавать; } [Обязательно] [Показать (с именем = "Описание")] public string Описание {get; задавать; } public bool Проверено {get; задавать; } общественный ICollection PostCategories {get; задавать; } } –

Я до сих пор не могу найти, почему вы видите эту ошибку, просто обновите вопрос и добавьте свой класс миграции, а также – Ziyad

здесь класс миграции, который автоматически генерируется для классов и работал хорошо в моем решении, дать ему попробовать:

public partial class Blog : DbMigration 
{ 
    public override void Up() 
    { 
     CreateTable(
      "dbo.PostCategories", 
      c => new 
       { 
        PostId = c.String(nullable: false, maxLength: 128), 
        CategoryId = c.String(nullable: false, maxLength: 128), 
        Checked = c.Boolean(nullable: false), 
       }) 
      .PrimaryKey(t => new { t.PostId, t.CategoryId }) 
      .ForeignKey("dbo.Categories", t => t.CategoryId, cascadeDelete: true) 
      .ForeignKey("dbo.Posts", t => t.PostId, cascadeDelete: true) 
      .Index(t => t.PostId) 
      .Index(t => t.CategoryId); 

     CreateTable(
      "dbo.Categories", 
      c => new 
       { 
        Id = c.String(nullable: false, maxLength: 128), 
        Name = c.String(nullable: false), 
        UrlSeo = c.String(nullable: false), 
        Description = c.String(nullable: false, maxLength: 20), 
        Checked = c.Boolean(nullable: false), 
       }) 
      .PrimaryKey(t => t.Id); 

     CreateTable(
      "dbo.Posts", 
      c => new 
       { 
        Id = c.String(nullable: false, maxLength: 128), 
        Title = c.String(nullable: false, maxLength: 50), 
        ShortDescription = c.String(nullable: false, maxLength: 250), 
        Body = c.String(nullable: false), 
        Meta = c.String(nullable: false, maxLength: 25), 
        UrlSeo = c.String(nullable: false), 
        Published = c.Boolean(nullable: false), 
        NetLikeCount = c.Int(nullable: false), 
        PostedOn = c.DateTime(nullable: false), 
        Modified = c.DateTime(), 
       }) 
      .PrimaryKey(t => t.Id); 

     CreateTable(
      "dbo.Comments", 
      c => new 
       { 
        Id = c.String(nullable: false, maxLength: 128), 
        PostId = c.String(maxLength: 128), 
        DateTime = c.DateTime(nullable: false), 
        UserName = c.String(), 
        Body = c.String(nullable: false, maxLength: 1000), 
        NetLikeCount = c.Int(nullable: false), 
        Deleted = c.Boolean(nullable: false), 
       }) 
      .PrimaryKey(t => t.Id) 
      .ForeignKey("dbo.Posts", t => t.PostId) 
      .Index(t => t.PostId); 

     CreateTable(
      "dbo.CommentLikes", 
      c => new 
       { 
        CommentId = c.String(nullable: false, maxLength: 128), 
        UserName = c.String(), 
        Like = c.Boolean(nullable: false), 
        DisLike = c.Boolean(nullable: false), 
        Comment_Id = c.String(maxLength: 128), 
       }) 
      .PrimaryKey(t => t.CommentId) 
      .ForeignKey("dbo.Comments", t => t.Comment_Id) 
      .Index(t => t.Comment_Id); 

     CreateTable(
      "dbo.Replies", 
      c => new 
       { 
        Id = c.String(nullable: false, maxLength: 128), 
        PostId = c.String(maxLength: 128), 
        CommentId = c.String(maxLength: 128), 
        ParentReplyId = c.String(), 
        DateTime = c.DateTime(nullable: false), 
        UserName = c.String(), 
        Body = c.String(nullable: false, maxLength: 1000), 
        Deleted = c.Boolean(nullable: false), 
       }) 
      .PrimaryKey(t => t.Id) 
      .ForeignKey("dbo.Comments", t => t.CommentId) 
      .ForeignKey("dbo.Posts", t => t.PostId) 
      .Index(t => t.PostId) 
      .Index(t => t.CommentId); 

     CreateTable(
      "dbo.ReplyLikes", 
      c => new 
       { 
        ReplyId = c.String(nullable: false, maxLength: 128), 
        UserName = c.String(), 
        Like = c.Boolean(nullable: false), 
        DisLike = c.Boolean(nullable: false), 
        Reply_Id = c.String(maxLength: 128), 
       }) 
      .PrimaryKey(t => t.ReplyId) 
      .ForeignKey("dbo.Replies", t => t.Reply_Id) 
      .Index(t => t.Reply_Id); 

     CreateTable(
      "dbo.PostLikes", 
      c => new 
       { 
        PostId = c.String(nullable: false, maxLength: 128), 
        UserName = c.String(), 
        Like = c.Boolean(nullable: false), 
        DisLike = c.Boolean(nullable: false), 
        Post_Id = c.String(maxLength: 128), 
       }) 
      .PrimaryKey(t => t.PostId) 
      .ForeignKey("dbo.Posts", t => t.Post_Id) 
      .Index(t => t.Post_Id); 

     CreateTable(
      "dbo.PostTags", 
      c => new 
       { 
        PostId = c.String(nullable: false, maxLength: 128), 
        TagId = c.String(nullable: false, maxLength: 128), 
        Checked = c.Boolean(nullable: false), 
       }) 
      .PrimaryKey(t => new { t.PostId, t.TagId }) 
      .ForeignKey("dbo.Posts", t => t.PostId, cascadeDelete: true) 
      .ForeignKey("dbo.Tags", t => t.TagId, cascadeDelete: true) 
      .Index(t => t.PostId) 
      .Index(t => t.TagId); 

     CreateTable(
      "dbo.Tags", 
      c => new 
       { 
        Id = c.String(nullable: false, maxLength: 128), 
        Name = c.String(nullable: false), 
        UrlSeo = c.String(nullable: false, maxLength: 20), 
        Checked = c.Boolean(nullable: false), 
       }) 
      .PrimaryKey(t => t.Id); 

     CreateTable(
      "dbo.PostVideos", 
      c => new 
       { 
        Id = c.String(nullable: false, maxLength: 128), 
        VideoUrl = c.String(nullable: false), 
        VideoThumbnail = c.String(), 
        PostId = c.String(maxLength: 128), 
        VideoSiteName = c.String(), 
       }) 
      .PrimaryKey(t => t.Id) 
      .ForeignKey("dbo.Posts", t => t.PostId) 
      .Index(t => t.PostId); 

    } 

    public override void Down() 
    { 
     DropForeignKey("dbo.PostVideos", "PostId", "dbo.Posts"); 
     DropForeignKey("dbo.PostTags", "TagId", "dbo.Tags"); 
     DropForeignKey("dbo.PostTags", "PostId", "dbo.Posts"); 
     DropForeignKey("dbo.PostLikes", "Post_Id", "dbo.Posts"); 
     DropForeignKey("dbo.PostCategories", "PostId", "dbo.Posts"); 
     DropForeignKey("dbo.ReplyLikes", "Reply_Id", "dbo.Replies"); 
     DropForeignKey("dbo.Replies", "PostId", "dbo.Posts"); 
     DropForeignKey("dbo.Replies", "CommentId", "dbo.Comments"); 
     DropForeignKey("dbo.Comments", "PostId", "dbo.Posts"); 
     DropForeignKey("dbo.CommentLikes", "Comment_Id", "dbo.Comments"); 
     DropForeignKey("dbo.PostCategories", "CategoryId", "dbo.Categories"); 
     DropIndex("dbo.PostVideos", new[] { "PostId" }); 
     DropIndex("dbo.PostTags", new[] { "TagId" }); 
     DropIndex("dbo.PostTags", new[] { "PostId" }); 
     DropIndex("dbo.PostLikes", new[] { "Post_Id" }); 
     DropIndex("dbo.ReplyLikes", new[] { "Reply_Id" }); 
     DropIndex("dbo.Replies", new[] { "CommentId" }); 
     DropIndex("dbo.Replies", new[] { "PostId" }); 
     DropIndex("dbo.CommentLikes", new[] { "Comment_Id" }); 
     DropIndex("dbo.Comments", new[] { "PostId" }); 
     DropIndex("dbo.PostCategories", new[] { "CategoryId" }); 
     DropIndex("dbo.PostCategories", new[] { "PostId" }); 
     DropTable("dbo.PostVideos"); 
     DropTable("dbo.Tags"); 
     DropTable("dbo.PostTags"); 
     DropTable("dbo.PostLikes"); 
     DropTable("dbo.ReplyLikes"); 
     DropTable("dbo.Replies"); 
     DropTable("dbo.CommentLikes"); 
     DropTable("dbo.Comments"); 
     DropTable("dbo.Posts"); 
     DropTable("dbo.Categories"); 
     DropTable("dbo.PostCategories"); 
    } 
}

источник

2016-09-13 10:08:26 Ziyad

вы используете ядро mvc и, пожалуйста, покажите мне свой класс ApplicationDbContext –

нет, я использую MVC 5, EF6 с шаблоном проекта по умолчанию – Ziyad

Вот почему я использую ядро asp .net, но нацеленное на полный фреймворк –

Я пытаюсь добавить миграции, но я получаю сообщение об ошибке, как я могу решить эту проблему

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