i want to execute the code in this question https://gis.stackexchange.com/questions/142391/storing-geojson-featurecollection-to-postgresql-with-postgis/142479#142479 but when i run the app i receive the following error:
x
query="""
KeyError: ' "type"'
please let me know how to fix it.
code:
def exeGeoFromGeoJSONToWKT(self):
query="""
WITH data AS (
SELECT '{ "type": "FeatureCollection",
"features": [
{ "type": "Feature",
"geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
"properties": {"prop0": "value0"}
},
{ "type": "Feature",
"geometry": {
"type": "LineString",
"coordinates": [
[102.0, 0.0], [103.0, 1.0], [104.0, 0.0], [105.0, 1.0]
]
},
"properties": {
"prop0": "value0",
"prop1": 0.0
}
},
{ "type": "Feature",
"geometry": {
"type": "Polygon",
"coordinates": [
[ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0],
[100.0, 1.0], [100.0, 0.0] ]
]
},
"properties": {
"prop0": "value0",
"prop1": {"this": "that"}
}
}
]}'::json AS featuresCollection)
SELECT
LIDARDataPolygonsAsGeometry
FROM (
SELECT
ST_Transform(ST_SetSRID(ST_GeomFromGeoJSON(feature->>'geometry'),4326),25832) AS LIDARDataPolygonsAsGeometry
FROM (SELECT json_array_elements(featuresCollection->'features') AS feature
FROM data) AS f
"""
print(query)
data = self.connection.query(query,[])
# print(data)
return data
attempts:
query="""
WITH data AS (
SELECT $${ "type": "FeatureCollection",
"features": [
{ "type": "Feature",
"geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
"properties": {"prop0": "value0"}
}
]}$$::json AS featuresCollection)
SELECT
LIDARDataPolygonsAsGeometry
FROM (
SELECT
ST_Transform(ST_SetSRID(ST_GeomFromGeoJSON(feature->>'geometry'),4326),25832) AS LIDARDataPolygonsAsGeometry
FROM (SELECT json_array_elements(featuresCollection->'features') AS feature
FROM data) AS f
"""
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Answer
From the database perspective the query works just fine, but the issue seems to be in the query building. Your query has a JSON document containing multiple "
double quotes, so either you escape them ("
) or try to add the JSON to the query using parameters as described in this other answer.
Unrelated: You do not need these 3 nested subqueries. A single query would do:
WITH data AS (
SELECT '{ "type": "FeatureCollection",
]}'::json AS mygeojson
)
SELECT
ST_Transform(
ST_SetSRID(
ST_GeomFromGeoJSON(json_array_elements(
mygeojson->'features')->>'geometry'),
4326),
25832) AS feature
FROM data