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add distance calculation with 'near' search

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This commit is contained in:
Christian Quest 2016-05-08 16:09:29 +02:00
parent 093bda5fa6
commit 48a18584c3
1 changed files with 4 additions and 2 deletions
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6
backend.py
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@ -74,11 +74,14 @@ class EventResource(object):
if 'bbox' in req.params:
# limit search with bbox (E,S,W,N)
event_bbox = cur.mogrify(" AND geom && ST_SetSRID(ST_MakeBox2D(ST_Point(%s,%s),ST_Point(%s,%s)),4326) ",tuple(req.params['bbox'])).decode("utf-8")
event_dist = ""
elif 'near' in req.params:
# limit search with location+distance (long, lat, distance in meters)
event_bbox = cur.mogrify(" AND geom && st_expand(st_buffer(st_setsrid(st_makepoint(%s,%s),4326)::geography,%s)::geometry,0) ",tuple(req.params['near'])).decode("utf-8")
event_dist = cur.mogrify(", 'distance', ST_Length(ST_ShortestLine(geom, st_setsrid(st_makepoint(%s,%s),4326))::geography) ",(req.params['near'][0], req.params['near'][1])).decode("utf-8")
else:
event_bbox = ""
event_dist = ""
if 'when' in req.params:
# limit search with fixed time
@ -107,10 +110,9 @@ class EventResource(object):
else:
event_type = ""
print(event_when + event_what + event_type)
# search recent active events
cur.execute("""
SELECT '{"type":"Feature", "properties": '|| (events_tags::jsonb || jsonb_build_object('id',events_id,'createdate',createdate,'lastupdate',lastupdate))::text ||', "geometry":'|| st_asgeojson(st_centroid(geom)) ||' }' as feature
SELECT '{"type":"Feature", "properties": '|| (events_tags::jsonb || jsonb_build_object('id',events_id,'createdate',createdate,'lastupdate',lastupdate """+event_dist+"""))::text ||', "geometry":'|| st_asgeojson(st_centroid(geom)) ||' }' as feature
FROM events
JOIN geo ON (hash=events_geo) """ + event_bbox +"""
WHERE events_when && """+ event_when + event_what + event_type +"""