def geojson(request):
try:
westlng = request.GET["westlng"]
eastlng = request.GET["eastlng"]
northlat = request.GET["northlat"]
southlat = request.GET["southlat"]
except KeyError:
return json_response({})
wkt = (
"POLYGON(("
"%(w)s %(s)s, "
"%(w)s %(n)s, "
"%(e)s %(n)s, "
"%(e)s %(s)s, "
"%(w)s %(s)s"
"))" % {"w": westlng, "e": eastlng, "s": southlat, "n": northlat}
)
qs = Parcel.objects.filter(geom__intersects=wkt).prefetch_mapped()
features = []
serializer = UIParcelSerializer()
for parcel in qs:
feature = Feature(parcel.id)
feature.geometry = {
"type": parcel.geom.geom_type,
"coordinates": parcel.geom.coords,
}
feature.properties = serializer.one(parcel)
features.append(feature)
output = GeoJSON.GeoJSON().encode(features, to_string=False)
return json_response(output)
def decode(self, query_set, generator = False):
results = []
for res in query_set:
feature = Feature(res.pk)
if self.pickled_geometry:
feature.geometry = pickle.loads(res.geometry)
elif self.geodjango:
geometry = None
geom = getattr(res, self.geodjango)
if geom:
geometry = {}
geometry['type'] = geom.geom_type
geometry['coordinates'] = geom.coords
feature.geometry = geometry
if self.pickled_properties:
props = getattr(res, self.pickled_properties)
feature.properties = pickle.loads(props.encode("utf-8"))
if self.properties:
for p in self.properties:
feature.properties[p] = getattr(res, p)
results.append(feature)
return results
def decode(self, query_set, generator=False):
results = []
for res in query_set:
feature = Feature(res.pk)
if self.pickled_geometry:
feature.geometry = pickle.loads(res.geometry)
elif self.geodjango:
geometry = None
geom = getattr(res, self.geodjango)
if geom:
geometry = {}
geometry['type'] = geom.geom_type
geometry['coordinates'] = geom.coords
feature.geometry = geometry
if self.pickled_properties:
props = getattr(res, self.pickled_properties)
feature.properties = pickle.loads(props.encode("utf-8"))
if self.properties:
for p in self.properties:
feature.properties[p] = getattr(res, p)
results.append(feature)
return results
def _createFeature(self, feature_dict, id = None):
"""Private. Not designed to be used externally."""
feature = Feature(id)
if feature_dict.has_key('geometry'):
feature.geometry = feature_dict['geometry']
if feature_dict.has_key('properties'):
feature.properties = feature_dict['properties']
return feature
def _createFeature(self, feature_dict, id=None):
"""Private. Not designed to be used externally."""
feature = Feature(id)
if feature_dict.has_key("geometry"):
feature.geometry = feature_dict["geometry"]
if feature_dict.has_key("properties"):
feature.properties = feature_dict["properties"]
return feature
def decode(self, query_set, generator=False):
results = []
for res in query_set:
feature = Feature(res.id)
if self.pickled_geometry:
feature.geometry = pickle.loads(res.geometry)
elif self.geodjango:
geom = getattr(res, self.geodjango)
geometry = {}
geometry["type"] = geom.geom_type
geometry["coordinates"] = geom.coords
feature.geometry = geometry
if self.pickled_properties:
props = getattr(res, self.pickled_properties)
feature.properties = pickle.loads(props.encode("utf-8"))
if self.properties:
for p in self.properties:
feature.properties[p] = getattr(res, p)
if self.style:
feature.properties["style"] = self.style
if self.relation_data:
for method, models in self.relation_data.iteritems():
if method == "set_count":
for model in models:
try:
result = getattr(res, model + "_set")
count = getattr(result, "count")
feature.properties[model + "_" + method] = count()
except AttributeError, err:
feature.properties[model + "_" + method] = "AttributeError"
if method == "values_list":
for model in models:
try:
result = getattr(res, model)
all_list = list(result.values_list())
feature.properties[model + "_" + method] = all_list
except AttributeError, err:
feature.properties[model + "_" + method] = "AttributeError"
if method == "display":
for model in models:
try:
display = "get_%s_display" % (model)
result = getattr(res, display)
feature.properties[model + "_" + method] = result()
except AttributeError, err:
feature.properties[model + "_" + method] = "AttributeError"
def decode(self, query_set, generator=False):
results = []
for res in query_set:
feature = Feature(res.id)
if self.pickled_geometry:
feature.geometry = pickle.loads(res.geometry)
elif self.geodjango:
geom = getattr(res, self.geodjango)
geometry = {}
geometry['type'] = geom.geom_type
geometry['coordinates'] = geom.coords
feature.geometry = geometry
if self.pickled_properties:
props = getattr(res, self.pickled_properties)
feature.properties = pickle.loads(props.encode("utf-8"))
if self.properties:
for p in self.properties:
# This simple change allows us to span relationships between models:
# feature.properties[p] = getattr(res, p)
feature.properties[p] = reduce(getattr, p.split('__'), res)
# An argument can be passed to access querysets (one to many relationships)
# from each Feature returned, appending the querysets to the value's 'properties'
if self.queries:
for q in self.queries:
itemslist = []
for queryresult in q.getset(res):
item = {}
for k, v in queryresult.iteritems():
item[k] = v
itemslist.append(item)
feature.properties[q.queryparameters] = itemslist
results.append(feature)
return results
def decode(self, query_set, generator = False):
results = []
for res in query_set:
feature = Feature(res.id)
if self.pickled_geometry:
feature.geometry = pickle.loads(res.geometry)
elif self.geodjango:
geom = getattr(res, self.geodjango)
geometry = {}
geometry['type'] = geom.geom_type
geometry['coordinates'] = geom.coords
feature.geometry = geometry
if self.pickled_properties:
props = getattr(res, self.pickled_properties)
feature.properties = pickle.loads(props.encode("utf-8"))
if self.properties:
for p in self.properties:
# This simple change allows us to span relationships between models:
# feature.properties[p] = getattr(res, p)
feature.properties[p] = reduce(getattr, p.split('__'), res)
# An argument can be passed to access querysets (one to many relationships)
# from each Feature returned, appending the querysets to the value's 'properties'
if self.queries:
for q in self.queries:
itemslist = []
for queryresult in q.getset(res):
item = {}
for k,v in queryresult.iteritems():
item[k] = v
itemslist.append(item)
feature.properties[q.queryparameters] = itemslist
results.append(feature)
return results
