WebAPI 从其他模型返回 json

我可能我的搜索措辞错误，但我还没有找到任何与从控制器返回"更多"json相关的内容，而不仅仅是我正在使用的控制器/模型。我读到的内容让我想相信我的数据库存在关系或映射问题，但同样，我不确定从哪里开始。

目前我的控制器只返回：

{
  "Id": 43,
  "CreatedDate": "2015-02-09T00:00:00",
  "CreatedBy": "username",
  "ClosedDate": "2015-02-09T00:00:00",
  "ClosedBy": "username",
  "Revision": "1"
}

我正在尝试返回如下所示的内容：

{
    "JobDetails": {
        "Tasks": [{
            "Id": 1,
            "TaskName": "string",
            "TaskDescription": "string",
            "TaskOrder": 1,
            "TimeCompleted": "DateTime",
            "CompletedBy": "string",
            "Notes": [{
                "Note": "This is note 1.",
                "CreatedDate": "DateTime",
                "CreatedBy": "string"
            }, {
                "Note": "This is note 2.",
                "CreatedDate": "DateTime",
                "CreatedBy": "string"
            }]
        }]
    }
}

内容来自我的"JobsController"，在POST之后，您可以看到填充其他字段。

// POST: api/Jobs
[Route("api/Jobs/PostJob/", Name="PostJobRoute")]
[ResponseType(typeof(Job))]
public IHttpActionResult PostJob(Job job)
{
    if (!ModelState.IsValid)
    {
        return BadRequest(ModelState);
    }
    //Run query to get a list of all tasks that have the group ID passed
    IQueryable<Task> TasksQuery =
        from c in db.Tasks
        select c;
    //Execute and loop results...
    IQueryable<Task> TasksByGroupId = TasksQuery.Where(c => c.TaskGroupId == 1);
    foreach (var task in TasksByGroupId)
    {
        db.JobDetails.Add(new JobDetail()
        {
            //Generate a new job detail for this job
            JobId = job.Id,
            TimeCompleted = DateTime.Now,
            CompletedBy = "ocodyc",
            TaskId = task.Id,
            TaskIdOrder = task.TaskOrder
        });
    }
    //TODO: Return a list of the task + notes
    db.Jobs.Add(job);
    db.SaveChanges();
    return CreatedAtRoute("PostJobRoute", new { id = job.Id }, job);
}

这似乎是一个映射问题吗？我尝试将导航属性添加到"作业"到"作业详细信息"，但这不起作用。

var jobDetailList = new List<JobDetail>();
foreach (var task in TasksByGroupId)
{
    jobDetailList.Add(new JobDetail()
    {
        //Generate a new job detail for this job
        JobId = job.Id,
        TimeCompleted = DateTime.Now,
        CompletedBy = "ocodyc",
        TaskId = task.Id,
        TaskIdOrder = task.TaskOrder
    });
}
//TODO: Return a list of the task + notes
db.Jobs.AddRange(jobDetailList);
db.SaveChanges();
return CreatedAtRoute("PostJobRoute", new { id = job.Id }, jobDetailList.AsEnumerable());