Liam Steckler
e6722876bd
To enable us to detect changes to to the geometry for future updating of the map (#67) Reviewed-on: #68
30 lines
924 B
Python
30 lines
924 B
Python
from shapely import MultiPolygon, Polygon, Geometry, to_wkb, from_wkb
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from sqlalchemy.types import TypeDecorator, LargeBinary
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def convert_outage_geometry(event) -> MultiPolygon:
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assert event["polygons"]["type"] == "polygon"
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assert event["polygons"]["hasZ"] is False
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assert event["polygons"]["hasM"] is False
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polygon_list = []
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for ring in event["polygons"]["rings"]:
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polygon_list.append(Polygon(ring))
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return MultiPolygon(polygon_list)
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class DBGeometry(TypeDecorator):
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impl = LargeBinary
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cache_ok = True
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def process_bind_param(self, value, dialect):
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if isinstance(value, Geometry):
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value = to_wkb(value)
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return value
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def process_result_value(self, value, dialect):
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if value is None:
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return value
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else:
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if not isinstance(value, Geometry):
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value = from_wkb(value)
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return value
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