Add support for Python 3.9 and Django 3.1

Author: mikicz

django_pgviews/view.py

@@ -33,7 +33,7 @@ def hasfield(model_cls, field_name):
     try:
         model_cls._meta.get_field(field_name)
         return True
-    except models.FieldDoesNotExist:
+    except exceptions.FieldDoesNotExist:
         return False
 
 

setup.py

@@ -26,8 +26,13 @@
         "Development Status :: 5 - Production/Stable",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Framework :: Django",
-        "Framework :: Django :: 2.0",
+        "Framework :: Django :: 2.2",
         "Framework :: Django :: 3.0",
+        "Framework :: Django :: 3.1",
     ],
 )

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py{36,37,38}-dj{22,30}
+envlist = py{36,37,38,39}-dj{22,30,31}
 
 [testenv]
 usedevelop = true
@@ -10,6 +10,7 @@ deps=
     -rtests/requirements.txt
     dj22: https://github.com/django/django/archive/stable/2.2.x.tar.gz#egg=django
     dj30: https://github.com/django/django/archive/stable/3.0.x.tar.gz#egg=django
+    dj31: https://github.com/django/django/archive/stable/3.1.x.tar.gz#egg=django
 commands=
     python manage.py test  {posargs:test_project.viewtest}
 passenv = DB_NAME DB_USER DB_PASSWORD