Querying a name with "space" in between returns TypeError on Overpass Query

[mtmendoza]

Hi! I'd like to ask how to resolve the issue where querying an overpass name that most probably be because of a space in between causes a TypeError.

This is how the code looks like in my python views:

def query_overpass(request):
    query = request.GET['query']
    print(query)
    overpass = Overpass()
    city_query = "rel[name="+ query + "][type=boundary][boundary=administrative];out geom;"
    city_boundary = overpass.query(city_query)
    result = json.dumps(city_boundary.toJSON())
    return render(request, 'plexus/home.html', {'result': result})

and the error it raises:

Quezon City
Internal Server Error: /search/
Traceback (most recent call last):
  File "/home/gridlockdev/Desktop/heroku/grace/env/lib/python3.5/site-packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/home/gridlockdev/Desktop/heroku/grace/env/lib/python3.5/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/gridlockdev/Desktop/heroku/grace/env/lib/python3.5/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/gridlockdev/Desktop/heroku/grace/network/views.py", line 40, in query_overpass
    city_boundary = overpass.query(city_query)
  File "/home/gridlockdev/Desktop/heroku/grace/env/lib/python3.5/site-packages/OSMPythonTools/internal/cacheObject.py", line 38, in query
    result = self._rawToResult(data, queryString)
  File "/home/gridlockdev/Desktop/heroku/grace/env/lib/python3.5/site-packages/OSMPythonTools/overpass.py", line 44, in _rawToResult
    return OverpassResult(data, queryString)
  File "/home/gridlockdev/Desktop/heroku/grace/env/lib/python3.5/site-packages/OSMPythonTools/overpass.py", line 73, in __init__
    self._elements = list(map(lambda e: Element(json=e), self.__get('elements')))
  File "/home/gridlockdev/Desktop/heroku/grace/env/lib/python3.5/site-packages/OSMPythonTools/overpass.py", line 87, in __get
    return self._json[prop] if prop in self._json else None
TypeError: argument of type 'NoneType' is not iterable

At first I assumed that there really might be no element to return, but I tried it over at Overpass Turbo and it returns exactly what I want. See: http://overpass-turbo.eu/s/tfP

Other than this problem, it works great! 👍

Hope you could help! Thanks in advance!

[mocnik-science]

Hi Theresa,
in Overpass Turbo, you used quotation marks. If you add them to your code, it should work:

def query_overpass(request):
    ...
    city_query = "rel[name=\""+ query + "\"][type=boundary][boundary=administrative];out geom;"
    ...

Does this solve your problem?

[mtmendoza]

YES! Thank you for a quick response! I did not notice that small mistake since it queries nicely on single names. :)

[mocnik-science]

Great to hear. If you like osm-python-tools, feel free to "star" it. ;)