Question

I’m having trouble figuring out how to get my navigation property to update with the Entity Framework. I used a database first approach and set up all appropriate FK relationships. Here’s what the two tables I’m working with look like:

Rate Profile

• RateProfileID
• ProfileName

Rate

• RateID
• RateProfileID (FK)
• Several Other Properties I Want to Update

One RateProfile can/will have many Rates. I built my edit page for RateProfile to display editors for the RateProfile Entity and all of it’s associated Rate entities and stuck all of that in a form with a submit button. I can display everything just fine, but my changes will only persist for the model class (RateProfile) and not for its navigation property (Rates).

Below are my views/HttpPost Edit/ Models
In my HttpPost Edit method, you can see my feeble attempt to loop through and Update each record in the navigation property Rates of the model.

@model  PDR.Models.RateProfile

@using (Html.BeginForm()) {
@Html.ValidationSummary(true)
<fieldset>
    <legend>RateProfile</legend>

    @Html.HiddenFor(model => model.RateProfileID)
    @Html.HiddenFor(model => model.LoginID)

    <div class="editor-label">
        @Html.LabelFor(model => model.ProfileName)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.ProfileName)
        @Html.ValidationMessageFor(model => model.ProfileName)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.isDefault)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.isDefault)
        @Html.ValidationMessageFor(model => model.isDefault)
    </div>
    <div>
        <fieldset>
        <legend>Dime</legend>
        <table>
            <tr>
                <th>
                    Min
                </th>
                <th>
                    Max
                </th>
                <th>
                    Price
                </th>
                <th></th>
            </tr>
        @foreach (var rate in Model.Rates)
        {
            <tr>
                <td>
                    @Html.EditorFor(modelItem => rate.minCount)

                    @Html.ValidationMessageFor(model => rate.minCount)
                </td>
                <td>
                    @Html.EditorFor(modelItem => rate.maxCount)
                    @Html.ValidationMessageFor(model => rate.maxCount)
                </td>
                <td>
                    @Html.EditorFor(modelItem => rate.Amount)
                    @Html.ValidationMessageFor(model => rate.Amount)
                </td>
            </tr>
        }
        </table>
    </fieldset>

    <p>
        <input type="submit" value="Save" />
    </p>
</fieldset>
}

---

[HttpPost]
    public ActionResult Edit(RateProfile rateprofile)
    {

        if (ModelState.IsValid)

        {
            db.Entry(rateprofile).State = EntityState.Modified;

            foreach (Rate rate in rateprofile.Rates)
            {
                db.Entry(rate).State = EntityState.Modified;
            }
            db.SaveChanges();
            return RedirectToAction("Index");
        }
        return View(rateprofile);
    }

---

public partial class Rate
{
    public int RateID { get; set; }
    public int RateProfileID { get; set; }
    public string Size { get; set; }
    public decimal Amount { get; set; }
    public int minCount { get; set; }
    public int maxCount { get; set; }
    public int PanelID { get; set; }

    public virtual Panel Panel { get; set; }
    public virtual RateProfile RateProfile { get; set; }
}

public partial class RateProfile
{
    public RateProfile()
    {
        this.Rates = new HashSet<Rate>();
    }

    public int RateProfileID { get; set; }
    public string ProfileName { get; set; }
    public int LoginID { get; set; }
    public bool isDefault { get; set; }

    public virtual Login Login { get; set; }
    public virtual ICollection<Rate> Rates { get; set; }
}

Answer 1

You change the foreach into for statement and try whether the model binding is working fine or not.

@for (var int i = 0; i < Model.Rates; i++)
{
    <tr>
        <td>
            @Html.EditorFor(modelItem => Model.Rates[i].minCount)
            @Html.ValidationMessageFor(model => Model.Rates[i].minCount)
        </td>
        <td>
            @Html.EditorFor(modelItem => Model.Rates[i].maxCount)
            @Html.ValidationMessageFor(model => Model.Rates[i].maxCount)
        </td>
        <td>
            @Html.EditorFor(modelItem => Model.Rates[i].Amount)
            @Html.ValidationMessageFor(model => Model.Rates[i].Amount)
        </td>
    </tr>
}