from unittest import skipIf from django.contrib.gis.db.models import fields from django.contrib.gis.geos import MultiPolygon, Polygon from django.core.exceptions import ImproperlyConfigured from django.db import connection, migrations, models from django.db.migrations.migration import Migration from django.db.migrations.state import ProjectState from django.test import ( TransactionTestCase, skipIfDBFeature, skipUnlessDBFeature, ) from ..utils import mysql, spatialite try: GeometryColumns = connection.ops.geometry_columns() HAS_GEOMETRY_COLUMNS = True except NotImplementedError: HAS_GEOMETRY_COLUMNS = False class OperationTestCase(TransactionTestCase): available_apps = ['gis_tests.gis_migrations'] def tearDown(self): # Delete table after testing if hasattr(self, 'current_state'): self.apply_operations('gis', self.current_state, [migrations.DeleteModel('Neighborhood')]) super().tearDown() @property def has_spatial_indexes(self): if mysql: with connection.cursor() as cursor: return connection.introspection.supports_spatial_index(cursor, 'gis_neighborhood') return True def get_table_description(self, table): with connection.cursor() as cursor: return connection.introspection.get_table_description(cursor, table) def assertColumnExists(self, table, column): self.assertIn(column, [c.name for c in self.get_table_description(table)]) def assertColumnNotExists(self, table, column): self.assertNotIn(column, [c.name for c in self.get_table_description(table)]) def apply_operations(self, app_label, project_state, operations): migration = Migration('name', app_label) migration.operations = operations with connection.schema_editor() as editor: return migration.apply(project_state, editor) def set_up_test_model(self, force_raster_creation=False): test_fields = [ ('id', models.AutoField(primary_key=True)), ('name', models.CharField(max_length=100, unique=True)), ('geom', fields.MultiPolygonField(srid=4326)) ] if connection.features.supports_raster or force_raster_creation: test_fields += [('rast', fields.RasterField(srid=4326, null=True))] operations = [migrations.CreateModel('Neighborhood', test_fields)] self.current_state = self.apply_operations('gis', ProjectState(), operations) def assertGeometryColumnsCount(self, expected_count): table_name = 'gis_neighborhood' if connection.features.uppercases_column_names: table_name = table_name.upper() self.assertEqual( GeometryColumns.objects.filter(**{ GeometryColumns.table_name_col(): table_name, }).count(), expected_count ) def assertSpatialIndexExists(self, table, column, raster=False): with connection.cursor() as cursor: constraints = connection.introspection.get_constraints(cursor, table) if raster: self.assertTrue(any( 'st_convexhull(%s)' % column in c['definition'] for c in constraints.values() if c['definition'] is not None )) else: self.assertIn([column], [c['columns'] for c in constraints.values()]) def alter_gis_model(self, migration_class, model_name, field_name, blank=False, field_class=None, field_class_kwargs=None): args = [model_name, field_name] if field_class: field_class_kwargs = field_class_kwargs or {'srid': 4326, 'blank': blank} args.append(field_class(**field_class_kwargs)) operation = migration_class(*args) old_state = self.current_state.clone() operation.state_forwards('gis', self.current_state) with connection.schema_editor() as editor: operation.database_forwards('gis', editor, old_state, self.current_state) class OperationTests(OperationTestCase): def setUp(self): super().setUp() self.set_up_test_model() def test_add_geom_field(self): """ Test the AddField operation with a geometry-enabled column. """ self.alter_gis_model(migrations.AddField, 'Neighborhood', 'path', False, fields.LineStringField) self.assertColumnExists('gis_neighborhood', 'path') # Test GeometryColumns when available if HAS_GEOMETRY_COLUMNS: self.assertGeometryColumnsCount(2) # Test spatial indices when available if self.has_spatial_indexes: self.assertSpatialIndexExists('gis_neighborhood', 'path') @skipUnlessDBFeature('supports_raster') def test_add_raster_field(self): """ Test the AddField operation with a raster-enabled column. """ self.alter_gis_model(migrations.AddField, 'Neighborhood', 'heatmap', False, fields.RasterField) self.assertColumnExists('gis_neighborhood', 'heatmap') # Test spatial indices when available if self.has_spatial_indexes: self.assertSpatialIndexExists('gis_neighborhood', 'heatmap', raster=True) def test_add_blank_geom_field(self): """ Should be able to add a GeometryField with blank=True. """ self.alter_gis_model(migrations.AddField, 'Neighborhood', 'path', True, fields.LineStringField) self.assertColumnExists('gis_neighborhood', 'path') # Test GeometryColumns when available if HAS_GEOMETRY_COLUMNS: self.assertGeometryColumnsCount(2) # Test spatial indices when available if self.has_spatial_indexes: self.assertSpatialIndexExists('gis_neighborhood', 'path') @skipUnlessDBFeature('supports_raster') def test_add_blank_raster_field(self): """ Should be able to add a RasterField with blank=True. """ self.alter_gis_model(migrations.AddField, 'Neighborhood', 'heatmap', True, fields.RasterField) self.assertColumnExists('gis_neighborhood', 'heatmap') # Test spatial indices when available if self.has_spatial_indexes: self.assertSpatialIndexExists('gis_neighborhood', 'heatmap', raster=True) def test_remove_geom_field(self): """ Test the RemoveField operation with a geometry-enabled column. """ self.alter_gis_model(migrations.RemoveField, 'Neighborhood', 'geom') self.assertColumnNotExists('gis_neighborhood', 'geom') # Test GeometryColumns when available if HAS_GEOMETRY_COLUMNS: self.assertGeometryColumnsCount(0) @skipUnlessDBFeature('supports_raster') def test_remove_raster_field(self): """ Test the RemoveField operation with a raster-enabled column. """ self.alter_gis_model(migrations.RemoveField, 'Neighborhood', 'rast') self.assertColumnNotExists('gis_neighborhood', 'rast') def test_create_model_spatial_index(self): if not self.has_spatial_indexes: self.skipTest('No support for Spatial indexes') self.assertSpatialIndexExists('gis_neighborhood', 'geom') if connection.features.supports_raster: self.assertSpatialIndexExists('gis_neighborhood', 'rast', raster=True) @skipUnlessDBFeature("supports_3d_storage") @skipIf(spatialite, "Django currently doesn't support altering Spatialite geometry fields") def test_alter_geom_field_dim(self): Neighborhood = self.current_state.apps.get_model('gis', 'Neighborhood') p1 = Polygon(((0, 0), (0, 1), (1, 1), (1, 0), (0, 0))) Neighborhood.objects.create(name='TestDim', geom=MultiPolygon(p1, p1)) # Add 3rd dimension. self.alter_gis_model( migrations.AlterField, 'Neighborhood', 'geom', False, fields.MultiPolygonField, field_class_kwargs={'srid': 4326, 'dim': 3} ) self.assertTrue(Neighborhood.objects.first().geom.hasz) # Rewind to 2 dimensions. self.alter_gis_model( migrations.AlterField, 'Neighborhood', 'geom', False, fields.MultiPolygonField, field_class_kwargs={'srid': 4326, 'dim': 2} ) self.assertFalse(Neighborhood.objects.first().geom.hasz) @skipIfDBFeature('supports_raster') class NoRasterSupportTests(OperationTestCase): def test_create_raster_model_on_db_without_raster_support(self): msg = 'Raster fields require backends with raster support.' with self.assertRaisesMessage(ImproperlyConfigured, msg): self.set_up_test_model(force_raster_creation=True) def test_add_raster_field_on_db_without_raster_support(self): msg = 'Raster fields require backends with raster support.' with self.assertRaisesMessage(ImproperlyConfigured, msg): self.set_up_test_model() self.alter_gis_model( migrations.AddField, 'Neighborhood', 'heatmap', False, fields.RasterField )