Merge branch 'django-2.1' into 'master'

Upgrade to django 2.1

See merge request !76

arkindex/dataimport/migrations/0002_repository_revision.py

@@ -82,7 +82,7 @@ class Migration(migrations.Migration):
             name='watched_branches',
             field=arkindex.project.fields.ArrayField(
                 base_field=models.CharField(max_length=50),
-                default=['refs/heads/master'],
+                default=arkindex.dataimport.models.repository_default_branches,
                 size=None,
             ),
         ),

arkindex/dataimport/models.py

@@ -146,6 +146,15 @@ class RepositorySource(Enum):
     GitLab = 'gitlab'
 
 
+def repository_default_branches():
+    '''
+    This is needed to avoid re-using the same list instance
+    as Repository.watched_branches default on new instances
+    See Django warning postgres.E003
+    '''
+    return list('refs/heads/master')
+
+
 class Repository(models.Model):
     id = models.UUIDField(primary_key=True, default=uuid.uuid4)
     url = models.URLField(unique=True)
@@ -154,7 +163,7 @@ class Repository(models.Model):
     clone_token = models.CharField(max_length=250)
     corpus = models.ForeignKey('documents.Corpus', on_delete=models.CASCADE, related_name='repos')
     user = models.ForeignKey('users.User', on_delete=models.CASCADE, related_name='repos')
-    watched_branches = ArrayField(models.CharField(max_length=50), default=['refs/heads/master'])
+    watched_branches = ArrayField(models.CharField(max_length=50), default=repository_default_branches)
 
     class Meta:
         verbose_name_plural = 'repositories'

requirements.txt

@@ -2,7 +2,7 @@ celery==4.2.0
 celery_once==2.0.0
 certifi==2017.7.27.1
 chardet==3.0.4
-Django==2.0
+Django==2.1
 django-enumfields==0.10.0
 djangorestframework==3.7.1
 django-webpack-loader==0.5.0