mirror of https://github.com/django/django.git
100 lines
3.3 KiB
Python
100 lines
3.3 KiB
Python
import json
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from django.contrib.gis.shortcuts import numpy
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from django.core.exceptions import ImproperlyConfigured
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from django.test import (
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TestCase, TransactionTestCase, mock, skipUnlessDBFeature,
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)
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from ..data.rasters.textrasters import JSON_RASTER
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from ..models import models
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from .models import RasterModel
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@skipUnlessDBFeature('supports_raster')
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class RasterFieldTest(TransactionTestCase):
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available_apps = ['gis_tests.rasterapp']
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def test_field_null_value(self):
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"""
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Test creating a model where the RasterField has a null value.
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"""
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r = RasterModel.objects.create(rast=None)
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r.refresh_from_db()
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self.assertIsNone(r.rast)
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def test_access_band_data_directly_from_queryset(self):
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RasterModel.objects.create(rast=JSON_RASTER)
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qs = RasterModel.objects.all()
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qs[0].rast.bands[0].data()
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def test_model_creation(self):
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"""
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Test RasterField through a test model.
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"""
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# Create model instance from JSON raster
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r = RasterModel.objects.create(rast=JSON_RASTER)
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r.refresh_from_db()
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# Test raster metadata properties
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self.assertEqual((5, 5), (r.rast.width, r.rast.height))
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self.assertEqual([0.0, -1.0, 0.0, 0.0, 0.0, 1.0], r.rast.geotransform)
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self.assertIsNone(r.rast.bands[0].nodata_value)
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# Compare srs
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self.assertEqual(r.rast.srs.srid, 4326)
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# Compare pixel values
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band = r.rast.bands[0].data()
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# If numpy, convert result to list
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if numpy:
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band = band.flatten().tolist()
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# Loop through rows in band data and assert single
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# value is as expected.
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self.assertEqual(
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[
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0.0, 1.0, 2.0, 3.0, 4.0,
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5.0, 6.0, 7.0, 8.0, 9.0,
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10.0, 11.0, 12.0, 13.0, 14.0,
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15.0, 16.0, 17.0, 18.0, 19.0,
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20.0, 21.0, 22.0, 23.0, 24.0
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],
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band
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)
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def test_implicit_raster_transformation(self):
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"""
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Test automatic transformation of rasters with srid different from the
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field srid.
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"""
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# Parse json raster
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rast = json.loads(JSON_RASTER)
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# Update srid to another value
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rast['srid'] = 3086
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# Save model and get it from db
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r = RasterModel.objects.create(rast=rast)
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r.refresh_from_db()
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# Confirm raster has been transformed to the default srid
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self.assertEqual(r.rast.srs.srid, 4326)
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# Confirm geotransform is in lat/lon
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self.assertEqual(
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r.rast.geotransform,
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[-87.9298551266551, 9.459646421449934e-06, 0.0,
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23.94249275457565, 0.0, -9.459646421449934e-06]
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)
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def test_verbose_name_arg(self):
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"""
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RasterField should accept a positional verbose name argument.
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"""
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self.assertEqual(
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RasterModel._meta.get_field('rast').verbose_name,
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'A Verbose Raster Name'
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)
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@mock.patch('django.contrib.gis.db.models.fields.HAS_GDAL', False)
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class RasterFieldWithoutGDALTest(TestCase):
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def test_raster_field_without_gdal_exception(self):
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msg = 'RasterField requires GDAL.'
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with self.assertRaisesMessage(ImproperlyConfigured, msg):
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models.OriginalRasterField()
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