Adding features

We'll next implement the ability to add a new feature. To do this, we'll put an Add Feature button onto the "Edit Shapefile" view. Clicking on this button will call the "Edit Feature" URL, but without a feature ID. We'll then modify the "Edit Feature" view so that if no feature ID is given, a new Feature object is created.

Open the shapefiles application's views.py module, find the edit_shapefile() function, and add the following highlighted lines to this function:

def edit_shapefile(request, shapefile_id):
    try:
        shapefile = Shapefile.objects.get(id=shapefile_id)
    except Shapefile.DoesNotExist:
        raise Http404

    tms_url = "http://"+request.get_host()+"/tms/"
    find_feature_url = "http://" + request.get_host() \
                     + "/editor/find_feature"
    add_feature_url = "http://" + request.get_host() \
                    + "/edit_feature/" + str(shapefile_id)
 
    return render(request, "select_feature.html",
                  {'shapefile...