Add Django 3.0 and Python 3.8 support (#200)

* Update the way that `to_representation` removes already processed (#195)

fields, as per #194

* Upgrade GDAL to v2.x

* Fix test suite for Django v3.0

.travis.yml

@@ -19,11 +19,18 @@ matrix:
     - { python: "3.5", env: TOXENV=py35-django22 }
     - { python: "3.6", env: TOXENV=py36-django22 }
     - { python: "3.7", env: TOXENV=py37-django22 }
+    - { python: "3.6", env: TOXENV=py36-django30 }
+    - { python: "3.7", env: TOXENV=py37-django30 }
+    - { python: "3.8-dev", env: TOXENV=py38-django30 }
+
 
 branches:
   only:
     - master
-
+before_install:
+  - sudo add-apt-repository ppa:ubuntugis/ubuntugis-unstable -y
+  - sudo apt-get update -q
+  - sudo apt-get install binutils libproj-dev gdal-bin -y
 install:
   - pip install coverage tox
   - pip install docutils pygments  # for setup.py check -r -s

README.rst

@@ -39,7 +39,7 @@ Compatibility with DRF, Django and Python
 
 ===============  ============================ ==================== ==================================
 DRF-gis version  DRF version                  Django version       Python version
-**0.15.x**       **3.3** to **3.9**           **1.11** to **2.2**   **3.4** to **3.7**
+**0.15.x**       **3.3** to **3.9**           **1.11** to **3.0**   **3.4** to **3.8**
 **0.14.x**       **3.3** to **3.9**           **1.11** to **2.1**   **3.4** to **3.7**
 **0.13.x**       **3.3** to **3.8**           **1.11** to **2.0**   **2.7** to **3.6**
 **0.12.x**       **3.1** to **3.7**           **1.11** to **2.0**   **2.7** to **3.6**

tests/django_restframework_gis_tests/tests.py

@@ -35,7 +35,7 @@ def setUp(self):
         self.geojson_location_list_url = reverse('api_geojson_location_list')
         self.geos_error_message = 'Invalid format: string or unicode input unrecognized as GeoJSON, WKT EWKT or HEXEWKB.'
         self.gdal_error_message = 'Unable to convert to python object: Invalid geometry pointer returned from "OGR_G_CreateGeometryFromJson".'
-        if django.VERSION[0] == 2:
+        if django.VERSION >= (2, 0, 0):
             self.value_error_message = "Unable to convert to python object: String input unrecognized as WKT EWKT, and HEXEWKB."
         else:
             self.value_error_message = "Unable to convert to python object: String or unicode input unrecognized as WKT EWKT, and HEXEWKB."

tox.ini

@@ -2,6 +2,7 @@
 envlist =
     py{35,36,py3}-django111{,-pytest}
     py{35,36,37,py3}-django{21, 22}{,-pytest}
+    py{36,37,38,py3}-django{30}{,-pytest}
 
 [testenv]
 usedevelop = true
@@ -16,8 +17,8 @@ commands =
 
 deps =
     django111: Django~=1.11
-    django21: Django~=2.1
     django22: Django~=2.2
+    django30: Django~=3.0a1
     djangorestframework~=3.9
     -rrequirements-test.txt
     pytest: pytest