import os import unittest from copy import copy from decimal import Decimal from django.conf import settings from django.contrib.gis.gdal import DataSource from django.contrib.gis.utils.layermapping import ( InvalidDecimal, InvalidString, LayerMapError, LayerMapping, MissingForeignKey, ) from django.db import connection from django.test import TestCase, override_settings from .models import ( City, County, CountyFeat, ICity1, ICity2, Interstate, Invalid, State, city_mapping, co_mapping, cofeat_mapping, inter_mapping, ) shp_path = os.path.realpath(os.path.join(os.path.dirname(__file__), os.pardir, 'data')) city_shp = os.path.join(shp_path, 'cities', 'cities.shp') co_shp = os.path.join(shp_path, 'counties', 'counties.shp') inter_shp = os.path.join(shp_path, 'interstates', 'interstates.shp') invalid_shp = os.path.join(shp_path, 'invalid', 'emptypoints.shp') # Dictionaries to hold what's expected in the county shapefile. NAMES = ['Bexar', 'Galveston', 'Harris', 'Honolulu', 'Pueblo'] NUMS = [1, 2, 1, 19, 1] # Number of polygons for each. STATES = ['Texas', 'Texas', 'Texas', 'Hawaii', 'Colorado'] class LayerMapTest(TestCase): def test_init(self): "Testing LayerMapping initialization." # Model field that does not exist. bad1 = copy(city_mapping) bad1['foobar'] = 'FooField' # Shapefile field that does not exist. bad2 = copy(city_mapping) bad2['name'] = 'Nombre' # Nonexistent geographic field type. bad3 = copy(city_mapping) bad3['point'] = 'CURVE' # Incrementing through the bad mapping dictionaries and # ensuring that a LayerMapError is raised. for bad_map in (bad1, bad2, bad3): with self.assertRaises(LayerMapError): LayerMapping(City, city_shp, bad_map) # A LookupError should be thrown for bogus encodings. with self.assertRaises(LookupError): LayerMapping(City, city_shp, city_mapping, encoding='foobar') def test_simple_layermap(self): "Test LayerMapping import of a simple point shapefile." # Setting up for the LayerMapping. lm = LayerMapping(City, city_shp, city_mapping) lm.save() # There should be three cities in the shape file. self.assertEqual(3, City.objects.count()) # Opening up the shapefile, and verifying the values in each # of the features made it to the model. ds = DataSource(city_shp) layer = ds[0] for feat in layer: city = City.objects.get(name=feat['Name'].value) self.assertEqual(feat['Population'].value, city.population) self.assertEqual(Decimal(str(feat['Density'])), city.density) self.assertEqual(feat['Created'].value, city.dt) # Comparing the geometries. pnt1, pnt2 = feat.geom, city.point self.assertAlmostEqual(pnt1.x, pnt2.x, 5) self.assertAlmostEqual(pnt1.y, pnt2.y, 5) def test_layermap_strict(self): "Testing the `strict` keyword, and import of a LineString shapefile." # When the `strict` keyword is set an error encountered will force # the importation to stop. with self.assertRaises(InvalidDecimal): lm = LayerMapping(Interstate, inter_shp, inter_mapping) lm.save(silent=True, strict=True) Interstate.objects.all().delete() # This LayerMapping should work b/c `strict` is not set. lm = LayerMapping(Interstate, inter_shp, inter_mapping) lm.save(silent=True) # Two interstate should have imported correctly. self.assertEqual(2, Interstate.objects.count()) # Verifying the values in the layer w/the model. ds = DataSource(inter_shp) # Only the first two features of this shapefile are valid. valid_feats = ds[0][:2] for feat in valid_feats: istate = Interstate.objects.get(name=feat['Name'].value) if feat.fid == 0: self.assertEqual(Decimal(str(feat['Length'])), istate.length) elif feat.fid == 1: # Everything but the first two decimal digits were truncated, # because the Interstate model's `length` field has decimal_places=2. self.assertAlmostEqual(feat.get('Length'), float(istate.length), 2) for p1, p2 in zip(feat.geom, istate.path): self.assertAlmostEqual(p1[0], p2[0], 6) self.assertAlmostEqual(p1[1], p2[1], 6) def county_helper(self, county_feat=True): "Helper function for ensuring the integrity of the mapped County models." for name, n, st in zip(NAMES, NUMS, STATES): # Should only be one record b/c of `unique` keyword. c = County.objects.get(name=name) self.assertEqual(n, len(c.mpoly)) self.assertEqual(st, c.state.name) # Checking ForeignKey mapping. # Multiple records because `unique` was not set. if county_feat: qs = CountyFeat.objects.filter(name=name) self.assertEqual(n, qs.count()) def test_layermap_unique_multigeometry_fk(self): "Testing the `unique`, and `transform`, geometry collection conversion, and ForeignKey mappings." # All the following should work. # Telling LayerMapping that we want no transformations performed on the data. lm = LayerMapping(County, co_shp, co_mapping, transform=False) # Specifying the source spatial reference system via the `source_srs` keyword. lm = LayerMapping(County, co_shp, co_mapping, source_srs=4269) lm = LayerMapping(County, co_shp, co_mapping, source_srs='NAD83') # Unique may take tuple or string parameters. for arg in ('name', ('name', 'mpoly')): lm = LayerMapping(County, co_shp, co_mapping, transform=False, unique=arg) # Now test for failures # Testing invalid params for the `unique` keyword. for e, arg in ((TypeError, 5.0), (ValueError, 'foobar'), (ValueError, ('name', 'mpolygon'))): with self.assertRaises(e): LayerMapping(County, co_shp, co_mapping, transform=False, unique=arg) # No source reference system defined in the shapefile, should raise an error. if connection.features.supports_transform: with self.assertRaises(LayerMapError): LayerMapping(County, co_shp, co_mapping) # Passing in invalid ForeignKey mapping parameters -- must be a dictionary # mapping for the model the ForeignKey points to. bad_fk_map1 = copy(co_mapping) bad_fk_map1['state'] = 'name' bad_fk_map2 = copy(co_mapping) bad_fk_map2['state'] = {'nombre': 'State'} with self.assertRaises(TypeError): LayerMapping(County, co_shp, bad_fk_map1, transform=False) with self.assertRaises(LayerMapError): LayerMapping(County, co_shp, bad_fk_map2, transform=False) # There exist no State models for the ForeignKey mapping to work -- should raise # a MissingForeignKey exception (this error would be ignored if the `strict` # keyword is not set). lm = LayerMapping(County, co_shp, co_mapping, transform=False, unique='name') with self.assertRaises(MissingForeignKey): lm.save(silent=True, strict=True) # Now creating the state models so the ForeignKey mapping may work. State.objects.bulk_create([ State(name='Colorado'), State(name='Hawaii'), State(name='Texas') ]) # If a mapping is specified as a collection, all OGR fields that # are not collections will be converted into them. For example, # a Point column would be converted to MultiPoint. Other things being done # w/the keyword args: # `transform=False`: Specifies that no transform is to be done; this # has the effect of ignoring the spatial reference check (because the # county shapefile does not have implicit spatial reference info). # # `unique='name'`: Creates models on the condition that they have # unique county names; geometries from each feature however will be # appended to the geometry collection of the unique model. Thus, # all of the various islands in Honolulu county will be in in one # database record with a MULTIPOLYGON type. lm = LayerMapping(County, co_shp, co_mapping, transform=False, unique='name') lm.save(silent=True, strict=True) # A reference that doesn't use the unique keyword; a new database record will # created for each polygon. lm = LayerMapping(CountyFeat, co_shp, cofeat_mapping, transform=False) lm.save(silent=True, strict=True) # The county helper is called to ensure integrity of County models. self.county_helper() def test_test_fid_range_step(self): "Tests the `fid_range` keyword and the `step` keyword of .save()." # Function for clearing out all the counties before testing. def clear_counties(): County.objects.all().delete() State.objects.bulk_create([ State(name='Colorado'), State(name='Hawaii'), State(name='Texas') ]) # Initializing the LayerMapping object to use in these tests. lm = LayerMapping(County, co_shp, co_mapping, transform=False, unique='name') # Bad feature id ranges should raise a type error. bad_ranges = (5.0, 'foo', co_shp) for bad in bad_ranges: with self.assertRaises(TypeError): lm.save(fid_range=bad) # Step keyword should not be allowed w/`fid_range`. fr = (3, 5) # layer[3:5] with self.assertRaises(LayerMapError): lm.save(fid_range=fr, step=10) lm.save(fid_range=fr) # Features IDs 3 & 4 are for Galveston County, Texas -- only # one model is returned because the `unique` keyword was set. qs = County.objects.all() self.assertEqual(1, qs.count()) self.assertEqual('Galveston', qs[0].name) # Features IDs 5 and beyond for Honolulu County, Hawaii, and # FID 0 is for Pueblo County, Colorado. clear_counties() lm.save(fid_range=slice(5, None), silent=True, strict=True) # layer[5:] lm.save(fid_range=slice(None, 1), silent=True, strict=True) # layer[:1] # Only Pueblo & Honolulu counties should be present because of # the `unique` keyword. Have to set `order_by` on this QuerySet # or else MySQL will return a different ordering than the other dbs. qs = County.objects.order_by('name') self.assertEqual(2, qs.count()) hi, co = tuple(qs) hi_idx, co_idx = tuple(map(NAMES.index, ('Honolulu', 'Pueblo'))) self.assertEqual('Pueblo', co.name) self.assertEqual(NUMS[co_idx], len(co.mpoly)) self.assertEqual('Honolulu', hi.name) self.assertEqual(NUMS[hi_idx], len(hi.mpoly)) # Testing the `step` keyword -- should get the same counties # regardless of we use a step that divides equally, that is odd, # or that is larger than the dataset. for st in (4, 7, 1000): clear_counties() lm.save(step=st, strict=True) self.county_helper(county_feat=False) def test_model_inheritance(self): "Tests LayerMapping on inherited models. See #12093." icity_mapping = {'name': 'Name', 'population': 'Population', 'density': 'Density', 'point': 'POINT', 'dt': 'Created', } # Parent model has geometry field. lm1 = LayerMapping(ICity1, city_shp, icity_mapping) lm1.save() # Grandparent has geometry field. lm2 = LayerMapping(ICity2, city_shp, icity_mapping) lm2.save() self.assertEqual(6, ICity1.objects.count()) self.assertEqual(3, ICity2.objects.count()) def test_invalid_layer(self): "Tests LayerMapping on invalid geometries. See #15378." invalid_mapping = {'point': 'POINT'} lm = LayerMapping(Invalid, invalid_shp, invalid_mapping, source_srs=4326) lm.save(silent=True) def test_charfield_too_short(self): mapping = copy(city_mapping) mapping['name_short'] = 'Name' lm = LayerMapping(City, city_shp, mapping) with self.assertRaises(InvalidString): lm.save(silent=True, strict=True) def test_textfield(self): "String content fits also in a TextField" mapping = copy(city_mapping) mapping['name_txt'] = 'Name' lm = LayerMapping(City, city_shp, mapping) lm.save(silent=True, strict=True) self.assertEqual(City.objects.count(), 3) self.assertEqual(City.objects.get(name='Houston').name_txt, "Houston") def test_encoded_name(self): """ Test a layer containing utf-8-encoded name """ city_shp = os.path.join(shp_path, 'ch-city', 'ch-city.shp') lm = LayerMapping(City, city_shp, city_mapping) lm.save(silent=True, strict=True) self.assertEqual(City.objects.count(), 1) self.assertEqual(City.objects.all()[0].name, "Zürich") class OtherRouter: def db_for_read(self, model, **hints): return 'other' def db_for_write(self, model, **hints): return self.db_for_read(model, **hints) def allow_relation(self, obj1, obj2, **hints): # ContentType objects are created during a post-migrate signal while # performing fixture teardown using the default database alias and # don't abide by the database specified by this router. return True def allow_migrate(self, db, app_label, **hints): return True @override_settings(DATABASE_ROUTERS=[OtherRouter()]) class LayerMapRouterTest(TestCase): multi_db = True @unittest.skipUnless(len(settings.DATABASES) > 1, 'multiple databases required') def test_layermapping_default_db(self): lm = LayerMapping(City, city_shp, city_mapping) self.assertEqual(lm.using, 'other')