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// I feel like the responses datatype should be simplified from its current form, pasted here:
var data = {
  responses: [
    { parcels: [ {parcel_id: '10', responses: {'Q0': 0, 'Q1': 3}} ]  },
    { parcels: [ {parcel_id: '11', responses: {'Q0': 1, 'Q1': 4}} ]  }
  ]
};


// To one without the additional {parcels: } object, which doesn't seem to add much:
var data = {
  responses: [
    {parcel_id: '10', responses: {'Q0': 0, 'Q1': 3}},
    {parcel_id: '11', responses: {'Q0': 0, 'Q1': 3}},
    {parcel_id: '12', responses: {'Q0': 0, 'Q1': 3}},
  ]
};


// Alternately, we could make parcel_id a list:
var data = {
  responses: [
    {parcel_ids: ['10', '11'], responses: {'Q0': 0, 'Q1': 3}},
  ]
};