63 lines
1.8 KiB
Python
63 lines
1.8 KiB
Python
'''
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Common codebase for GeoAlchemy and GeoAlchemy2
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It is assumed that the relevant library is already installed, as we check
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it against the CKAN version on startup
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'''
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from ckan.plugins import toolkit
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from ckan.model import meta
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from sqlalchemy import types, Column, Table
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if toolkit.check_ckan_version(min_version='2.3'):
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# CKAN >= 2.3, use GeoAlchemy2
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from geoalchemy2.elements import WKTElement
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from geoalchemy2 import Geometry
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from sqlalchemy import func
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ST_Transform = func.ST_Transform
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legacy_geoalchemy = False
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else:
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# CKAN < 2.3, use GeoAlchemy
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from geoalchemy import WKTSpatialElement as WKTElement
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from geoalchemy.functions import transform as ST_Transform
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from geoalchemy import (Geometry, GeometryColumn, GeometryDDL,
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GeometryExtensionColumn)
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from geoalchemy.postgis import PGComparator
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legacy_geoalchemy = True
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def setup_spatial_table(package_extent_class, db_srid=None):
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if legacy_geoalchemy:
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package_extent_table = Table(
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'package_extent', meta.metadata,
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Column('package_id', types.UnicodeText, primary_key=True),
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GeometryExtensionColumn('the_geom', Geometry(2, srid=db_srid))
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)
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meta.mapper(
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package_extent_class,
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package_extent_table,
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properties={'the_geom':
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GeometryColumn(package_extent_table.c.the_geom,
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comparator=PGComparator)}
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)
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GeometryDDL(package_extent_table)
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else:
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package_extent_table = Table(
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'package_extent', meta.metadata,
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Column('package_id', types.UnicodeText, primary_key=True),
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Column('the_geom', Geometry('GEOMETRY', srid=db_srid)),
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)
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meta.mapper(package_extent_class, package_extent_table)
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return package_extent_table
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