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special handling for estimated postcode in areas

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Don't add a postcode at all if multiple estimated
postcodes fall into the area.
This commit is contained in:
Sarah Hoffmann 2017-07-09 17:29:48 +02:00
parent ec8af1dd40
commit 5673c4cf91
1 changed files with 25 additions and 7 deletions
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32
sql/functions.sql
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@ -321,6 +321,22 @@ CREATE OR REPLACE FUNCTION get_nearest_postcode(country VARCHAR(2), geom GEOMETR
DECLARE
item RECORD;
BEGIN
-- If the geometry is an area then only one postcode must be within
-- that area, otherwise consider the area as not having a postcode.
IF ST_GeometryType(geom) in ('ST_Polygon','ST_MultiPolygon') THEN
FOR item IN
SELECT min(postcode) as postcode, count(*) as cnt FROM
(SELECT postcode FROM location_postcode
WHERE ST_Contains(geom, location_postcode.geometry) LIMIT 2) sub
LOOP
IF item.cnt > 1 THEN
RETURN null;
ELSEIF item.cnt = 1 THEN
RETURN item.postcode;
END IF;
END LOOP;
END IF;
FOR item IN
SELECT postcode FROM location_postcode
WHERE ST_DWithin(geom, location_postcode.geometry, 0.05)
@ -1545,13 +1561,15 @@ BEGIN
--DEBUG: RAISE WARNING 'Got parent details from search name';
-- determine postcode
IF NEW.address is not null AND NEW.address ? 'postcode' THEN
NEW.postcode = NEW.address->'postcode';
ELSE
SELECT postcode FROM placex WHERE place_id = NEW.parent_place_id INTO NEW.postcode;
END IF;
IF NEW.postcode is null THEN
NEW.postcode := get_nearest_postcode(NEW.country_code, place_centroid);
IF NEW.rank_search > 4 THEN
IF NEW.address is not null AND NEW.address ? 'postcode' THEN
NEW.postcode = NEW.address->'postcode';
ELSE
SELECT postcode FROM placex WHERE place_id = NEW.parent_place_id INTO NEW.postcode;
END IF;
IF NEW.postcode is null THEN
NEW.postcode := get_nearest_postcode(NEW.country_code, place_centroid);
END IF;
END IF;
-- If there is no name it isn't searchable, don't bother to create a search record