Drop Django 2 support (#25)

.github/workflows/build.yml

@@ -0,0 +1,36 @@
+name: Build
+
+on: push
+
+jobs:
+  pytest:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.8.6
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.8.6
+      - name: Install poetry
+        run: python -m pip install --upgrade pip poetry
+      - name: Install dependencies
+        run: poetry install
+      - name: Run pytest
+        run: poetry run pytest --cov --cov-report xml
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: true
+  black:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.8.6
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.8.6
+      - name: Install black
+        run: python -m pip install --upgrade pip black
+      - name: Check formatting
+        run: black --check .

HISTORY.rst

@@ -1,3 +1,9 @@
+3.0 (2020-10-07)
+++++++++++++++++
+
+* Drop support for Django<3.
+
+
 2.1 (2019-12-05)
 ++++++++++++++++
 

pyproject.toml

@@ -4,21 +4,21 @@ build-backend = "poetry.masonry.api"
 
 [tool.poetry]
 name = "django-safemigrate"
-version = "2.1"
+version = "3.0"
 description = "Safely run migrations before deployment"
 authors = ["Ryan Hiebert <ryan@aspiredu.com>"]
 license = "MIT"
 readme = "README.rst"
 
 [tool.poetry.dependencies]
 python = "^3.6"
-django = ">=2.1,<4.0"
+django = "^3.0"
 
 [tool.poetry.dev-dependencies]
-pytest = "^5.1"
-black = "^19.3b0"
+pytest = "^6.1"
+black = "^20.8b1"
 codecov = "^2.0"
 pytest-cov = "^2.6"
 pytest-django = "^3.4"
 pytest-pythonpath = "^0.7.3"
-pytest-mock = "^1.10"
+pytest-mock = "^3.3"

src/django_safemigrate/apps.py

@@ -1,6 +1,6 @@
 """Add a safemigrate command."""
 from django.apps import AppConfig
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 
 class SafeMigrateConfig(AppConfig):

src/django_safemigrate/management/commands/safemigrate.py

@@ -48,7 +48,9 @@ def pre_migrate_receiver(self, *, plan, **_):
 
         # Check for invalid safe properties
         invalid = [
-            migration for migration in migrations if safety(migration) not in Safe
+            migration
+            for migration in migrations
+            if not isinstance(safety(migration), Safe) or safety(migration) not in Safe
         ]
         if invalid:
             self.stdout.write(self.style.MIGRATE_HEADING("Invalid migrations:"))