addFeatures request

[JamesCrandall]

I'm attempting to addFeatures in a .py script to an ArcGIS Server feature service.  Can anyone spot an issue with the payload?

My source code:

queryURL_dalId = DALfs + "/addFeatures"
params = urllib.urlencode({'f': 'json',
                           'features': json.dumps(feat),
                           'token': genTokenAGS()})

req = urllib2.Request(queryURL_dalId, params)
response = urllib2.urlopen(req)

jsonResultApp = json.load(response)
print jsonResultApp

#the result print is:
#{u'error': {u'message': u'Unable to complete operation.', u'code': 500, u'details': [u'Parser error: Some parameters could not be recognized.']}}‍‍‍‍‍‍‍‍‍‍‍‍‍

The params "feature" attribute looks like this:

{
  "geometry": {
    "rings": [
      [
        [
          -8916035.78019179,
          3084661.19599559
        ],
        [
          -8915988.0070495,
          3085052.93576556
        ],
        [
          -8915529.38488079,
          3085148.48205013
        ],
        [
          -8915424.28396684,
          3084804.51542474
        ],
        [
          -8914889.22476772,
          3084833.17930828
        ],
        [
          -8914593.03128233,
          3084336.33862437
        ],
        [
          -8913924.20728573,
          3084365.0025102
        ],
        [
          -8913859.51668594,
          3083941.53976998
        ],
        [
          -8914444.27714894,
          3083843.30241113
        ],
        [
          -8915008.00023389,
          3083843.30241113
        ],
        [
          -8916035.78019179,
          3084661.19599559
        ]
      ]
    ]
  },
  "attributes": {
    "activityLogId": "DAL-999",
    "scheduleId": "SCH-9",
    "agency": "blah"
  }
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Thanks for looking!

[JamesCrandall · Accepted solution]

It looks like the payload didn't contain "[" "]" brackets around the features parameter.  I made that into a variable instead of setting directly from json.dumps(feat) and it seemed to work. 

paramFeatures = json.dumps(feat)
params = urllib.urlencode({'f': 'json',
                           'features': paramFeatures,
                           'token': genTokenAGS()})‍‍‍‍