Model Binding in Nancy

Question

For some reason I cannot get NancyFx to bind to my model for a web page. I am self hosting with this if that matters.

Here is my route code:

Get["/fax.html"] = p =>
{
    FaxModel model = new FaxModel();

    var foundType = processes.Where(proc => proc.GetType().ToString().Contains("FaxServer"));
    if(foundType.First() != null)
    {
        bool enabled = Boolean.Parse(WorkflowSettings.GetValue(foundType.First().GetProcessName(), "Enabled"));
        bool deleteAfterSuccess = Boolean.Parse(WorkflowSettings.GetValue(foundType.First().GetProcessName(), "DeleteWorkflowItemsAfterSuccess"));

        model.EnableFaxes = enabled;
        model.DeleteFaxes = deleteAfterSuccess;

        // Bind the data
        this.BindTo<FaxModel>(model);
    }

    return View["fax.html"];
};

Here is my model:

[Serializable]
public class FaxModel
{
    public bool EnableFaxes { get; set; }
    public bool DeleteFaxes { get; set; }
}

Now here is my HTML code:

<div id="body">
  <form method="post" action="fax.html" name="fax_settings">
  <ul>
    <li>
      <input name="EnableFaxes" value="true" type="checkbox">Automated Faxing Enabled
    </li>
    <li>
      <div style="margin-left: 80px;"><input name="DeleteFaxes" value="true" type="checkbox">Delete workflow items when fax is successful</div>
    </li>
  </ul>
  <button name="Save">Save</button>
  </form>
</div>

I am unable to see why it is not populating these checkboxes at all. Anybody have an idea?

Answer 1

You are overwriting the settings with BindTo. Remove that call and return a view with parameter.

this.Bind and this.BindTo are used to bind input parameters (query, form, request body) to a model, not to bind data to a view.

Get["fax"] = p =>
{
    FaxModel model = new FaxModel();

    var foundType = processes.Where(proc => proc.GetType().ToString().Contains("FaxServer"));
    if(foundType.First() != null)
    {
        bool enabled = Boolean.Parse(WorkflowSettings.GetValue(foundType.First().GetProcessName(), "Enabled"));
        bool deleteAfterSuccess = Boolean.Parse(WorkflowSettings.GetValue(foundType.First().GetProcessName(), "DeleteWorkflowItemsAfterSuccess"));

        model.EnableFaxes = enabled;
        model.DeleteFaxes = deleteAfterSuccess;
    }

    return View["fax", model];
};

Or, as far as your model class follows the convention, you can just do:

return View[model];

See the view engine examples.

Also, your html should use the model properties like this:

<input name="EnableFaxes" value=@Model.EnableFaxes type="checkbox">Automated Faxing Enabled