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try to fix the similar places logic

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Schuyler Erle 2011-09-02 09:44:50 +00:00
parent 8bae1aec82
commit 6157fd6e71
2 changed files with 22 additions and 13 deletions
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25
gazetteer/places/models.py
View File

@ -32,7 +32,7 @@ class FeatureSearchManager(models.GeoManager):
if srid != 4326: bbox.transform(4326) # convert to lon/lat
qset = qset.filter(geometry__bboverlaps=bbox)
if text:
#self.set_threshold(threshold)
self.set_threshold(threshold)
# use the pg_trgm index
qset = qset.extra(select={"similarity":"similarity(preferred_name, %s)"},
select_params=[text],
@ -108,23 +108,32 @@ class Feature(models.Model):
def similar_features(self, max_distance=30000, scale_factor=2000, threshold=0.35, limit=20):
type(self).search.set_threshold(threshold)
sql = """
SELECT *, %s * similarity / (distance + 1.0) AS score FROM (
SELECT DISTINCT *, %s * similarity / (distance + 1.0) AS score FROM (
SELECT f.*, r.feature1_id, r.feature2_id, r.relationship_type,
similarity(preferred_name, %s) AS similarity,
st_distance_sphere(geometry, %s) AS distance
FROM places_feature f, places_relationship r
WHERE (r.feature1_id = %s AND r.feature2_id = f.id)
OR (r.feature2_id = %s AND r.feature1_id = f.id)
UNION
SELECT f.*, r.feature1_id, r.feature2_id, r.relationship_type,
similarity(preferred_name, %s) AS similarity,
st_distance_sphere(geometry, %s) AS distance
FROM places_feature f LEFT JOIN places_relationship r
ON (f.id=r.feature1_id OR f.id=r.feature2_id)
ON (f.id = r.feature1_id or f.id = r.feature2_id)
WHERE geometry && st_buffer(%s, %s)
AND preferred_name %% %s
AND f.id <> %s
AND (r.feature1_id IS NULL OR r.feature1_id = %s OR r.feature2_id = %s)
AND (r.feature1_id IS NULL or r.feature1_id = %s or r.feature2_id = %s)
LIMIT %s
) AS whatever
ORDER BY similarity / (distance + 1.0) DESC"""
qset = type(self).objects.raw(sql, [scale_factor, self.preferred_name,
"SRID=4326;" + self.geometry.centroid.wkt,
ORDER BY %s * similarity / (distance + 1.0) DESC"""
qset = type(self).objects.raw(sql, [scale_factor,
self.preferred_name, "SRID=4326;" + self.geometry.centroid.wkt,
self.id, self.id,
self.preferred_name, "SRID=4326;" + self.geometry.centroid.wkt,
self.geometry.centroid.wkt, max_distance*0.00001,
self.preferred_name, self.id, self.id, self.id, limit])
self.preferred_name, self.id, self.id, self.id, limit, scale_factor])
return qset
LANGUAGE_CHOICES = (

8
gazetteer/places/views.py
View File

@ -124,15 +124,15 @@ def add_relation(request):
feature1 = get_object_or_404_json(Feature, pk=feature1)
feature2 = get_object_or_404_json(Feature, pk=feature2)
rel_obj = None
verb = rel_obj = None
try:
rel_obj = Relationship.objects.get(feature1=feature1, feature2=feature2, relationship_type=relation)
rel_obj = Relationship.objects.get(feature1=feature1, feature2=feature2)
verb = "deleted"
except ObjectDoesNotExist:
rel_obj = Relationship(feature1=feature1, feature2=feature2, relationship_type=relation)
verb = "created"
if relation == "":
if rel_obj.id:
verb = "deleted"
if verb == "deleted":
rel_obj.delete()
if relation == "conflates":
feature2.is_primary = True