Fix a broken map on GeoNode

fix_broken_map.py

import json
from geonode.maps.models import Layer, Map

map = Map.objects.get(id=2512)

for layer in map.layer_set.filter(ows_url__icontains='worldmap.harvard.edu/geoserver/wms'):
    if layer.name is None:
        print 'This layer is None!!!'
    else:
        print 'Fixing layer %s' % layer.name
        gn_layer = Layer.objects.get(typename=layer.name)
        print layer.layer_params
        config = json.loads(layer.layer_params)
        title = config['title']
        selected = config['selected']
        new_config = {
            'title': title,
            'selected': selected,
            'url': 'http://worldmap.harvard.edu/geoserver/wms',
            'tiled': True,
            'local': True,
            'llbox': gn_layer.bbox_coords()
        }
        new_config_s = json.dumps(new_config)
        print new_config_s
        layer.layer_params = new_config_s
        layer.save()