0

我有以下类（我无法更新、添加属性或添加注释）：

public class ApprovalRuleset
{
    public Guid Id { get; set; }
    public List<ApprovalRule> ApprovalRules { get; protected internal set; }
}

public class ApprovalRule
{
    public Guid Id { get; set; }
    public string Value { get; protected internal set; }
}

我正在尝试使用 Entity Framework 6 编写一些 Fluent API 代码以将它们映射到两个表。

这是 ApprovalRule 配置：

public class ApprovalRuleEntityConfiguration : EntityTypeConfiguration<ApprovalRule>
{
    public ApprovalRuleEntityConfiguration()
    {
        HasKey(x => x.Id);
        Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
        Property(x => x.Value).IsRequired().HasMaxLength(450);
    }
}

到目前为止，我有：

public class ApprovalRulesetEntityConfiguration : EntityTypeConfiguration<ApprovalRuleset>
{
    public ApprovalRulesetEntityConfiguration()
    {
        HasKey(x => x.Id);
        Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
        HasMany(x => x.ApprovalRules);
    }
}

由于无法确定主键列，因此无法创建具有列“ApprovalRuleset_Id”的表“ApprovalRules”上的外键。使用 AddForeignKey fluent API 来完全指定外键。

public class ApprovalRulesetEntityConfiguration : EntityTypeConfiguration<ApprovalRuleset>
{
    public ApprovalRulesetEntityConfiguration()
    {
        HasKey(x => x.Id);
        Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
        HasRequired(x => x.ApprovalRules)
            .WithMany()
            .HasForeignKey(x => x.Id);
    }
}

多重性与关系“ApprovalRuleset_ApprovalRules”中角色“ApprovalRuleset_ApprovalRules_Target”中的引用约束冲突。因为从属角色中的所有属性都不可为空，所以主体角色的多重性必须为“1”。

我错过了什么？我花了很长时间搜索堆栈溢出和谷歌。

4

1 回答 1

0

您需要在 ApprovalRule 类中添加两个属性。然后映射将是这样的 -

public class ApprovalRuleset
{
    public Guid Id { get; set; }
    public List<ApprovalRule> ApprovalRules { get; protected internal set; }
}

public class ApprovalRule
{
    public Guid Id { get; set; }
    public string Value { get; protected internal set; }

    public int ApprovalRulesetId { get; set; }
    public virtual ApprovalRuleset ApprovalRuleset { get; set; }
}

public class ApprovalRulesetEntityConfiguration : EntityTypeConfiguration<ApprovalRuleset>
{
    public ApprovalRulesetEntityConfiguration()
    {
        HasKey(t => t.Id);
    }
}

public class ApprovalRuleEntityConfiguration : EntityTypeConfiguration<ApprovalRule>
{
    public ApprovalRuleEntityConfiguration()
    {
        HasKey(t => t.Id);

        /*Property(t => t.Value)
            .HasMaxLength(100);*/

        HasRequired(t => t.ApprovalRuleset)
            .WithMany(t => t.ApprovalRules)
            .HasForeignKey(d => d.ApprovalRulesetId);
    }
}
于 2017-07-07T15:38:04.020 回答