Auto start editing of feature

[mapcentia]

We've a need for starting Vidi and when zoom to a feature and auto start editing of it.

Something like calling:
http://127.0.0.1:3000/app/mydb/feature/?startedit=feature.polygon|1#osm/10/9.3137/56.817/v:feature.polygon
Where startedit=feature.polygon|1 is layername|pkey (primary key field is stored in the pkey property of Meta)

If a feature exists, when start editing it:

If it doesn't when start creating it. (In this case no zooming will be done). The key from the URL will be used as input. In this case a the new feature with value 1 in primary key field will be used. Something like this (normally we don't send primary key on INSERTS but in this case we have to do that)

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "gid": 1,
        "id": 8
      },
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              9.753799,
              56.808773
            ],
            [
              9.899368,
              56.834325
            ],
            [
              9.908981,
              56.79599
            ],
            [
              9.913101,
              56.754605
            ],
            [
              9.805984,
              56.741804
            ],
            [
              9.727707,
              56.74557
            ],
            [
              9.753799,
              56.808773
            ]
          ]
        ]
      }
    }
  ]
}

[sashuk]

Edge cases:

• the feature.polygon|12 is provided, the identifier 12 already exists, but the layer is dynamically loaded - ensure that feature with such identifier does not exist in the layer;
• the provided identifier already exists in the layer - start editing;
• check the possibility of inserting data with specified identifiers (gid's);