NancyFX Post - Bind to Object with List Parameter - nancy

Question

I am using Nancy and I have created a basic model with a List property on it. When I use the below GET method I get the expected JSON output. However when I try to POST back the same JSON I end up with an object with and empty list of strings. I created two properties just to verify that my issue wasn't because of instantiating the DataPoints parameter to a new List in the constructor. Does anyone have any ideas on why this isn't returning properly?
JSON Object Returned from Initial Get
{
"dataPoints": [
"0",
"1",
"2",
"3",
"4"
],
"dataPoints2": [
"0",
"1",
"2",
"3",
"4"
]
}
JSON Object Returned from Post:
{
"dataPoints": [],
"dataPoints2": []
}
Class:
public class BasicModel
{
private List<string> _dataPoints;
public List<string> DataPoints
{
get
{
if (_dataPoints == null)
{
_dataPoints = new List<string>();
}
return _dataPoints;
}
set
{
_dataPoints = value;
}
}
public List<string> DataPoints2 { get; set; }
public BasicModel()
{
DataPoints2 = new List<string>();
}
public BasicModel(int idx)
{
DataPoints2 = new List<string>();
for (int i = 0; i < idx; i++)
{
DataPoints.Add(i.ToString());
DataPoints2.Add(i.ToString());
}
}
}
Get Method:
Get["/basicModel/{idx}"] = parameters =>
{
int idx = Convert.ToInt32(parameters["idx"].ToString());
BasicModel m = new BasicModel(idx);
return Negotiate
.WithStatusCode(HttpStatusCode.OK)
.WithModel(m)
.WithView("default");
};
Post Method:
Post["/basicmodel"] = parameters =>
{
BasicModel m = new BasicModel();
this.BindTo(m);
return Negotiate
.WithStatusCode(HttpStatusCode.OK)
.WithModel(m)
.WithView("default");
};

Answer 1

You may be running into a know issue with BindTo create a new instance even though you give one.
You should be able use Bind instead of BindTo though and have bind return a new object:
Post["/basicmodel"] = parameters =>
{
BasicModel m = this.Bind();
return Negotiate
.WithStatusCode(HttpStatusCode.OK)
.WithModel(m)
.WithView("default");
};