我将ASP.NET Web API 2与Entity Framework 6.2结合使用来构建小型API系统。
我正在使用代码优先的方法来创建数据库。一切都很好，直到我意识到Discriminator表中只有一列User。
我花了数小时来寻找解决方案，几乎有话题说Discriminator是在该实体继承另一个实体时创建的。但是我的User实体是独立实体。
这是我的User实体：
public class User
{
#region Properties
public int Id { get; set; }
public string Email { get; set; }
[JsonIgnore]
public string Password { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Photo { get; set; }
public double Birthday { get; set; }
public UserRoles Role { get; set; }
#endregion
#region Navigation properties
[JsonIgnore]
public virtual ICollection<SkillCategory> SkillCategories { get; set; }
[JsonIgnore]
public virtual ICollection<UserDescription> UserDescriptions { get; set; }
[JsonIgnore]
public virtual ICollection<Project> Projects { get; set; }
[JsonIgnore]
public virtual ICollection<Hobby> Hobbies { get; set; }
#endregion
}
这是我的数据库上下文：
public class CvManagementDbContext : DbContext
{
#region Constructors
public CvManagementDbContext() : base("CvManagement")
{
Database.SetInitializer<CvManagementDbContext>(null);
}
#endregion
#region Overriden methods
/// <summary>
/// Called when model is being created.
/// </summary>
/// <param name="dbModelBuilder"></param>
protected override void OnModelCreating(DbModelBuilder dbModelBuilder)
{
// Remove pluralizing naming convention.
dbModelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
// Prevent database from cascade deleting.
dbModelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>();
// Initialize user table.
InitializeUserTable(dbModelBuilder);
// Initialize user description table.
InitializeUserDescriptionTable(dbModelBuilder);
// Initialize project table.
InitializeProjectTable(dbModelBuilder);
// Initialize project skill table.
InitializeProjectSkillTable(dbModelBuilder);
// Initialize skill table.
InitializeSkillTable(dbModelBuilder);
// Initialize project responsibility table.
InitializeProjectResponsibilityTable(dbModelBuilder);
// Initialize responsibility table.
InitializeResponsibilityTable(dbModelBuilder);
// Initialize skill table.
InitializeSkillCategory(dbModelBuilder);
// Initialize skill category skill relationship table.
InitializeSkillCategorySkillRelationshipTable(dbModelBuilder);
base.OnModelCreating(dbModelBuilder);
}
#endregion
#region Properties
/// <summary>
/// List of projects.
/// </summary>
public DbSet<Project> Projects { get; set; }
/// <summary>
/// List of skills.
/// </summary>
public DbSet<Skill> Skills { get; set; }
/// <summary>
/// List of personal skills.
/// </summary>
public DbSet<SkillCategorySkillRelationship> PersonalSkills { get; set; }
/// <summary>
/// List of project responsibilities.
/// </summary>
public DbSet<ProjectResponsibility> ProjectResponsibilities { get; set; }
/// <summary>
/// List of project skills.
/// </summary>
public DbSet<ProjectSkill> ProjectSkills { get; set; }
/// <summary>
/// List of responsibilities.
/// </summary>
public DbSet<Responsibility> Responsibilities { get; set; }
/// <summary>
/// List of skill categories.
/// </summary>
public DbSet<SkillCategory> SkillCategories { get; set; }
/// <summary>
/// List of users.
/// </summary>
public DbSet<User> Users { get; set; }
/// <summary>
/// List of user descriptions.
/// </summary>
public DbSet<UserDescription> UserDescriptions { get; set; }
#endregion
#region Table initialization
/// <summary>
/// Initialize user table.
/// </summary>
private void InitializeUserTable(DbModelBuilder dbModelBuilder)
{
var user = dbModelBuilder.Entity<User>();
user.HasKey(x => x.Id);
user.Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
}
/// <summary>
/// Initialize user description tabe,
/// </summary>
/// <param name="dbModelBuilder"></param>
private void InitializeUserDescriptionTable(DbModelBuilder dbModelBuilder)
{
var userDescription = dbModelBuilder.Entity<UserDescription>();
userDescription.HasRequired(x => x.User).WithMany(x => x.UserDescriptions).HasForeignKey(x => x.UserId);
}
/// <summary>
/// Initialize project table.
/// </summary>
/// <param name="dbModelBuilder"></param>
private void InitializeProjectTable(DbModelBuilder dbModelBuilder)
{
var project = dbModelBuilder.Entity<Project>();
project.HasKey(x => x.Id);
project.Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
project.HasRequired(x => x.User).WithMany(x => x.Projects).HasForeignKey(x => x.UserId);
}
/// <summary>
/// Initialize project skill table.
/// </summary>
/// <param name="dbModelBuilder"></param>
private void InitializeProjectSkillTable(DbModelBuilder dbModelBuilder)
{
var projectSkill = dbModelBuilder.Entity<ProjectSkill>();
projectSkill.HasKey(x => new { x.ProjectId, x.SkillId });
projectSkill.HasRequired(x => x.Skill).WithMany(x => x.ProjectSkills).HasForeignKey(x => x.SkillId);
projectSkill.HasRequired(x => x.Project).WithMany(x => x.ProjectSkills).HasForeignKey(x => x.ProjectId);
}
/// <summary>
/// Initialize skill table.
/// </summary>
/// <param name="dbModelBuilder"></param>
private void InitializeSkillTable(DbModelBuilder dbModelBuilder)
{
var skill = dbModelBuilder.Entity<Skill>();
skill.HasKey(x => x.Id);
skill.Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
}
/// <summary>
/// Initialize project responsibility table.
/// </summary>
/// <param name="dbModelBuilder"></param>
private void InitializeProjectResponsibilityTable(DbModelBuilder dbModelBuilder)
{
var projectResponsibility = dbModelBuilder.Entity<ProjectResponsibility>();
projectResponsibility.HasKey(x => new { x.ProjectId, x.ResponsibilityId });
projectResponsibility.HasRequired(x => x.Project).WithMany(x => x.ProjectResponsibilities)
.HasForeignKey(x => x.ResponsibilityId);
projectResponsibility.HasRequired(x => x.Responsibility).WithMany(x => x.ProjectResponsibilities)
.HasForeignKey(x => x.ResponsibilityId);
}
/// <summary>
/// Initialize responsibility table.
/// </summary>
/// <param name="dbModelBuilder"></param>
private void InitializeResponsibilityTable(DbModelBuilder dbModelBuilder)
{
var responsibility = dbModelBuilder.Entity<Responsibility>();
responsibility.HasKey(x => x.Id);
}
/// <summary>
/// Initialize skill category.
/// </summary>
/// <param name="dbModelBuilder"></param>
private void InitializeSkillCategory(DbModelBuilder dbModelBuilder)
{
var skillCategory = dbModelBuilder.Entity<SkillCategory>();
skillCategory.HasKey(x => x.Id);
skillCategory.Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
skillCategory.HasRequired(x => x.User).WithMany(x => x.SkillCategories).HasForeignKey(x => x.UserId);
}
/// <summary>
/// Initialize skill category - skill relationship.
/// </summary>
/// <param name="dbModelBuilder"></param>
private void InitializeSkillCategorySkillRelationshipTable(DbModelBuilder dbModelBuilder)
{
var skillCategorySkillRelationship = dbModelBuilder.Entity<SkillCategorySkillRelationship>();
skillCategorySkillRelationship.HasKey(x => new { x.SkillCategoryId, x.SkillId });
skillCategorySkillRelationship.HasRequired(x => x.Skill).WithMany(x => x.SkillCategorySkillRelationships).HasForeignKey(x => x.SkillId);
skillCategorySkillRelationship.HasRequired(x => x.SkillCategory)
.WithMany(x => x.SkillCategorySkillRelationships).HasForeignKey(x => x.SkillCategoryId);
}
#endregion
}
当我运行Add-Migration命令时，它总是创建Discriminator。
我做错了什么？
谢谢
**更新**
找到这个topic之后，我确实搜索了我的项目，并意识到有一个类UserViewModel继承了User实体。
这是我的UserViewModel代码：
public class UserViewModel : Models.Entities.User
{
}
当我删除继承项并再次删除Add-Migrations时，Discriminator列就神奇地消失了。
我不知道这是Entity Framework 6.2的功能还是bug，似乎是EF搜索所有项目并找到继承，即使继承的类未包含在Database上下文文件中
是否有解决方案可自动关闭此"feature"？
谢谢