def store_city_from_contact(contact):
"""
This function receives a contact parameter, which is an
entity of type 'Contact', and stores it in the DataStore
along with is geographical location.
"""
# If we don't have the contact's city yet, save it, along with its geo info
total_city_records = (
City.all().
filter('name =', contact.city).
filter('state =', contact.state).
filter('country = ', contact.country).
count()
)
if total_city_records == 0 and contact.city is not None:
location = get_geoinfo(contact.city)
# Store the city only if its geo location is available.
if location:
City(
name=contact.city,
state=contact.state,
country=contact.country,
location=db.GeoPt(location['latitude'], location['longitude'])
).put()
def list_contacts(request):
"""
The list of contacts. This view also fetches the cities
that the current contacts live in and the geographical postion
of those cities.
"""
# Set up the contacts query
contacts = (
Contact.all().
filter("owner =", users.get_current_user()).
order('creation_date')
)
# Paginate using django's pagination tools
paginator = Paginator(contacts, settings.PAGINATE_BY)
page = request.GET.get('page', 1)
try:
page_number = int(page)
except ValueError:
if page == 'last':
page_number = paginator.num_pages
else:
# Page is not 'last', nor can it be converted to an int.
raise Http404
try:
page_obj = paginator.page(page_number)
except InvalidPage:
raise Http404
# Get the cities that the contacts live in
_cities = []
for contact in copy.deepcopy(page_obj.object_list):
_cities.append(contact.city)
cities = set(_cities)
cities_list = []
if len(cities):
# Construct the cities string for our query
cities_str = u'('
for city in cities:
cities_str += "'%s'," % city
cities_str = cities_str.strip(',')
cities_str += u')'
# Create the cities query
for city in City.gql("WHERE name IN %s" % cities_str):
cities_list.append({
'name': city.name,
'latitude': city.location.lat,
'longitude': city.location.lon
})
# Create the context and render the template with pagination
# This part is adapted from django.views.generic.list_detail.oject_list
context = RequestContext(request, {
'object_list': page_obj.object_list,
'paginator': paginator,
'page_obj': page_obj,
# Legacy template context stuff. New templates should use page_obj
# to access this instead.
'is_paginated': page_obj.has_other_pages(),
'results_per_page': paginator.per_page,
'has_next': page_obj.has_next(),
'has_previous': page_obj.has_previous(),
'page': page_obj.number,
'next': page_obj.next_page_number(),
'previous': page_obj.previous_page_number(),
'first_on_page': page_obj.start_index(),
'last_on_page': page_obj.end_index(),
'pages': paginator.num_pages,
'hits': paginator.count,
'page_range': paginator.page_range,
# The cities list
'cities_list': cities_list
})
template = loader.get_template('contact_list.html')
# Return the rendered template
return HttpResponse(template.render(context))