ASP.Net MVC POST data not mapping to model

Question

I'm trying to build a model to receive data from a HTTPPOST.

The model is received and populated fine - except for IList<harsta> harequest

It shows as having a count of 1, but having null values against the fields: screenshot

My model is:

 public class HAR
 {
    public int api_version { get; set; }
    public IList<harsta> harequest { get; set; }
    public class harsta
    {
        public int ta_id { get; set; }
        public string partner_id { get; set; }
        public string partner_url { get; set; }
    }
   ...
   ...
    }

The Post data for harrequest is (should have 2 entries):

[{"ta_id":97497,"partner_id":"229547","partner_url":"http://partner.com/deeplink/to/229547"},
{"ta_id":97832,"partner_id":"id34234","partner_url":"http://partner.com/deeplink/to/id34234"}]

A screenshot from PostMan shows the form encoded data that is sent to the controller: ss2

Example Request (this is the example provided on the 3rd party website)

POST
http://partner-site.com/api_implementation/ha
BODY
api_version=4
&harequest=[{"ta_id":97497,"partner_id":"229547","partner_url":"http://partner.com/deeplink/to/229547"},{"ta_id":97832,"partner_id":"id34234","partner_url":"http://partner.com/deeplink/to/id34234"}]
&start_date=2013-07-01
...
&query_key=6167a22d1f87d2028bf60a8e5e27afa7_191_13602996000

I'm sure it's not mapping to my model, because of the way I've setup my model here:

    public IList<harsta> harequest { get; set; }
    public class harsta
    {
        public int ta_id { get; set; }
        public string partner_id { get; set; }
        public string partner_url { get; set; }
    }

Have I setup the model incorrectly, to receive the JSON data from the harequest field in the POST?

It is quite odd to see JSON in a form post. Maybe your should show us the relevant View code as well. — Sam Axe
– Sam Axe, Commented Nov 5, 2013 at 10:24
Hi @Dan-o - I've not got as far as the View yet - I need to get the FORM POST into the model - then I can start working on the rest. The form data is coming from a 3rd party - so I have no control over it. I have to write code to conform to what they post. Thanks a lot, Mark — Mark
– Mark, Commented Nov 5, 2013 at 10:26
Please post the code where you are calling the httpost method ha - it's probably in the view (EDIT: OK, I didn't see previous comments - I see now you don't have control over it). — Tomaz Tekavec
– Tomaz Tekavec, Commented Nov 5, 2013 at 10:29
The problem is you can't do a hybrid post like this and expect the automatic binding to work. It either has to be completely form-specific content or completely JSON. For example, in PostMan switch to Raw and set the content type to JSON and write pure JSON - it should work. — James
– James, Commented Nov 5, 2013 at 10:30
stackoverflow.com/questions/13196645/… - the manual decode suggestion looks promising. — Sam Axe
– Sam Axe, Commented Nov 5, 2013 at 10:30

Oswald Umeh · Accepted Answer · 2013-11-05 11:11:20Z

-1

First of all, I'm not exactly comfortable with the embedding of the Harsta class in the Har class. Not good practice separate them.

Secondly, I think your problem actually stems from the fact the property names in the JSON object(s) you are returning are enclosed in quotes. Get rid of the quotes for only the property names.

That is don't do this:

[{"ta_id":97497,"partner_id":"229547","partner_url":"http://partner.com/deeplink/to/229547"},
{"ta_id":97832,"partner_id":"id34234","partner_url":"http://partner.com/deeplink/to/id34234"}]

Do this instead:

[{ta_id:97497,partner_id:"229547",partner_url:"http://partner.com/deeplink/to/229547"},
{ta_id:97832,partner_id:"id34234",partner_url:"http://partner.com/deeplink/to/id34234"}].

answered Nov 5, 2013 at 11:11

community wiki

Oswald Umeh

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3 Comments

ediblecode Over a year ago

Instead of just saying it's bad practice, explain why too.

Mark Over a year ago

Hi Oswald - I have no control over the posted data - so removing quotes etc isn't possible. I have to work with the data shown in my question. Thanks anyway, Mark

Gregoire D. Over a year ago

Also getting rid of the quotes make it invalid JSON, so don't do that.

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