import os, unittest from copy import copy from datetime import date from decimal import Decimal from models import City, County, CountyFeat, Interstate, State, city_mapping, co_mapping, cofeat_mapping, inter_mapping from django.contrib.gis.utils.layermapping import LayerMapping, LayerMapError, InvalidDecimal, MissingForeignKey from django.contrib.gis.gdal import DataSource shp_path = os.path.dirname(__file__) 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') # 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(unittest.TestCase): def test01_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): try: lm = LayerMapping(City, city_shp, bad_map) except LayerMapError: pass else: self.fail('Expected a LayerMapError.') # A LookupError should be thrown for bogus encodings. try: lm = LayerMapping(City, city_shp, city_mapping, encoding='foobar') except LookupError: pass else: self.fail('Expected a LookupError') def test02_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, 6) self.assertAlmostEqual(pnt1.y, pnt2.y, 6) def test03_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. try: lm = LayerMapping(Interstate, inter_shp, inter_mapping) lm.save(silent=True, strict=True) except InvalidDecimal: pass else: self.fail('Should have failed on strict import with invalid decimal values.') # 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 test04_layermap_unique_multigeometry_fk(self): "Testing the `unique`, and `transform`, geometry collection conversion, and ForeignKey mappings." # All the following should work. try: # 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) except: self.fail('No exception should be raised for proper use of keywords.') # Testing invalid params for the `unique` keyword. for e, arg in ((TypeError, 5.0), (ValueError, 'foobar'), (ValueError, ('name', 'mpolygon'))): 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. 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'} self.assertRaises(TypeError, LayerMapping, County, co_shp, bad_fk_map1, transform=False) 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') self.assertRaises(MissingForeignKey, lm.save, silent=True, strict=True) # Now creating the state models so the ForeignKey mapping may work. co, hi, tx = State(name='Colorado'), State(name='Hawaii'), State(name='Texas') co.save(), hi.save(), tx.save() # 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 test05_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() # 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. clear_counties() bad_ranges = (5.0, 'foo', co_shp) for bad in bad_ranges: self.assertRaises(TypeError, lm.save, fid_range=bad) # Step keyword should not be allowed w/`fid_range`. fr = (3, 5) # layer[3:5] 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. qs = County.objects.all() 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 suite(): s = unittest.TestSuite() s.addTest(unittest.makeSuite(LayerMapTest)) return s