概述
谢谢！
SEARCHED_LOCATION = db.GeoPt("48.8566667,2.3509871") # Location of Paris.
DISTANCE = 50000 #Between 10000 and 150000.
MAX_RESULTS = 300
# Resolution '4' is about 150 kilometers i suppose it's a good compromise.
bBox = geocell.compute_Box(geocell.compute(SEARCHED_LOCATION,resolution=4))
cell = geocell.best_bBox_search_cells(bBox,geomodel.default_cost_function)
query.filter('location_geocells IN',cell)
# Python filters
def _func(x):
"""Private method used to set the distance of the model to the searched location
and return this distance.
"""
x.dist = geomath.distance(SEARCHED_LOCATION,x.location)
return x.dist
results = sorted(query.fetch(MAX_RESULTS),key=_func) # Order the result by distance
results = [x for x in results if x.dist <= DISTANCE] # Filter the result总结
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