Question

我每天都在战斗,我仍然失败。

I can simplify the problem as follows: I have reports and reports have forms. I have entity models of each. They have Guid id s as shown below.

“Model”/

我正试图提出一个看法,我可以在报告中提出一份报告和表格。作为最终目标,我希望能够增加多种形式,但只有一种。我的控制者如下:

    // GET: /AllInOne/Create

    public ActionResult Create()
    {
        ViewBag.PossibleReportBases = reportBaseRepository.All;
        ViewBag.PossibleCategories = categoryRepository.All;

        var model = new Report {FromDate = DateTime.Now};
        model.Forms.Add(new Form());
        return View(model);
    }

    // POST: /AllInOne/Create

    [HttpPost]
    public ActionResult Create(Report report)
    {
        if (ModelState.IsValid) {
            reportRepository.InsertOrUpdate(report);
            reportRepository.Save();
            return RedirectToAction("Index");
        }
        else
        {
            ViewBag.PossibleReportBases = reportBaseRepository.All;
            ViewBag.PossibleCategories = categoryRepository.All;
            return View();
        }
    }

保管人守则认为:

    public void InsertOrUpdate(Report report)
    {
        if (report.Id == default(System.Guid)) {
            // New entity
            report.Id = Guid.NewGuid();
            context.Reports.AddObject(report);
        } else {
            // Existing entity
            context.Reports.Attach(report);
            context.ObjectStateManager.ChangeObjectState(report, EntityState.Modified);
        }
    }

At one stage the binding was giving me this error: The EntityCollection has already been initialized. The InitializeRelatedCollection method should only be called to initialize a new EntityCollection during deserialization of an object graph.

我为这些看法做了很多尝试,但其中没有任何工作。

请提供帮助。

Answer 1

i 坚决认为你需要随附。如果你从你的角度选择报告,报告就已经跟踪。您可以简化您的存放地。

   public void InsertOrUpdate(Report report)
    {
        // i prefer Guid.Empty but no big deal
        if (report.Id == default(System.Guid)) {
            // New entity
            report.Id = Guid.NewGuid();
            context.Reports.AddObject(report);
        } 
        context.SaveChanges();
    }

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