我有以下模型结构:
技能 意图(SkillId的外键) 话语(IntentId的外键) 插槽(UtteranceId的外键)
意图模型
public class Intent
{
[Key]
public int Id { get; set; }
[ForeignKey("Skill")]
public int? SkillId { get; set; }
public string Description { get; set; }
public virtual Skill Skill { get; set; }
public virtual List<Utterance> Utterances { get; set; }
}
话语模型
public class Utterance
{
[Key]
public int Id { get; set; }
[ForeignKey("Intent")]
public int IntentId { get; set; }
public string Utterancetext { get; set; }
public virtual Intent Intent { get; set; }
public virtual List<Slot> Slots { get; set; }
}
广告位模型
public class Slot
{
[Key]
public int Id { get; set; }
[ForeignKey("Utterance")]
public int UtteranceId { get; set; }
public string SlotValue { get; set; }
public SlotDataTypes SlotDataType { get; set; }
public virtual Utterance Utterance { get; set; }
}
实体框架更流畅的API
modelBuilder.Entity<Intent>()
.HasOptional(i => i.Skill)
.WithMany(sk => sk.Intents)
.HasForeignKey(i => i.SkillId);
modelBuilder.Entity<Utterance>()
.HasRequired(x => x.Intent)
.WithMany(x => x.Utterances)
.HasForeignKey(x => x.IntentId);
modelBuilder.Entity<Slot>()
.HasRequired(x => x.Utterance)
.WithMany(x => x.Slots)
.HasForeignKey(x => x.UtteranceId);
在我的数据访问服务中,我有一个方法应该获得Intents&gt;话语&gt;槽。
var intents = ctx.Intents.Include(x => x.Utterances).Include("Utterances.Slots").ToList(); //<-- utterances are populated, slots count is 0
var utterances = ctx.Utterances.Include(x => x.Slots).ToList(); // utterances are populated, slots are populated
var slots = ctx.Slots.ToList(); // slots are populated
return intents;
第一个电话是我需要的,让我得到所有的意图,他们相关的话语和话语相关的插槽。话语是填充的,但是插槽总是为零,即使数据库中肯定有插槽,第二次调用证明了,因为如果我直接进行话语,并包括插槽,我就会回来。
我在哪里错误地将Intent导航一直到Slots?
答案 0 :(得分:1)
解决方案是写:
var intents = ctx.Intents.Include(x => x.Utterances.Select(u => u.Slots)).ToList();
在包含集合属性后,调用Select
撰写其他包含。