From 87cd31f6a5bdf1955bb43ed8063875aee7fb6c2d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Norman=20J=C3=A4ckel?= <openslides@normanjaeckel.de>
Date: Thu, 12 Feb 2015 18:48:14 +0100
Subject: [PATCH] Updated ViewSets to Django REST Framework 3.0.5. Refactored
 imports from openslides/utils/rest_api.py for better overriding them later.

Fixed #1450. Updated requirements.
---
 openslides/agenda/serializers.py     | 14 ++++++-------
 openslides/agenda/views.py           |  8 ++++----
 openslides/assignment/serializers.py | 14 ++++++-------
 openslides/assignment/views.py       |  5 ++---
 openslides/config/views.py           |  8 ++++----
 openslides/core/serializers.py       |  6 +++---
 openslides/core/views.py             |  8 +++-----
 openslides/mediafile/serializers.py  |  6 +++---
 openslides/mediafile/views.py        |  5 ++---
 openslides/motion/serializers.py     | 30 ++++++++++++++--------------
 openslides/motion/views.py           | 11 ++++------
 openslides/users/serializers.py      | 10 +++++-----
 openslides/users/views.py            |  8 +++-----
 openslides/utils/rest_api.py         | 13 ++++++++++--
 requirements_production.txt          |  2 +-
 15 files changed, 74 insertions(+), 74 deletions(-)

diff --git a/openslides/agenda/serializers.py b/openslides/agenda/serializers.py
index 88f3b63ce..0ced4060a 100644
--- a/openslides/agenda/serializers.py
+++ b/openslides/agenda/serializers.py
@@ -1,11 +1,11 @@
 from django.core.urlresolvers import reverse
 
-from openslides.utils.rest_api import get_collection_and_id_from_url, serializers
+from openslides.utils.rest_api import CharField, ModelSerializer, RelatedField, get_collection_and_id_from_url
 
 from .models import Item, Speaker
 
 
-class SpeakerSerializer(serializers.ModelSerializer):
+class SpeakerSerializer(ModelSerializer):
     """
     Serializer for agenda.models.Speaker objects.
     """
@@ -19,7 +19,7 @@ class SpeakerSerializer(serializers.ModelSerializer):
             'weight')
 
 
-class RelatedItemRelatedField(serializers.RelatedField):
+class RelatedItemRelatedField(RelatedField):
     """
     A custom field to use for the content_object generic relationship.
     """
@@ -34,14 +34,14 @@ class RelatedItemRelatedField(serializers.RelatedField):
         return {'collection': collection, 'id': obj_id}
 
 
-class ItemSerializer(serializers.ModelSerializer):
+class ItemSerializer(ModelSerializer):
     """
     Serializer for agenda.models.Item objects.
     """
-    get_title = serializers.CharField(read_only=True)
-    get_title_supplement = serializers.CharField(read_only=True)
+    get_title = CharField(read_only=True)
+    get_title_supplement = CharField(read_only=True)
     content_object = RelatedItemRelatedField(read_only=True)
-    item_no = serializers.CharField(read_only=True)
+    item_no = CharField(read_only=True)
     speaker_set = SpeakerSerializer(many=True, read_only=True)
 
     class Meta:
diff --git a/openslides/agenda/views.py b/openslides/agenda/views.py
index 1c39cd09e..715b808d6 100644
--- a/openslides/agenda/views.py
+++ b/openslides/agenda/views.py
@@ -25,7 +25,7 @@ from openslides.projector.api import (
     get_overlays)
 from openslides.utils.exceptions import OpenSlidesError
 from openslides.utils.pdf import stylesheet
-from openslides.utils.rest_api import viewsets
+from openslides.utils.rest_api import ModelViewSet
 from openslides.utils.utils import html_strong
 from openslides.utils.views import (
     AjaxMixin,
@@ -775,11 +775,11 @@ class ItemCSVImportView(CSVImportView):
     template_name = 'agenda/item_form_csv_import.html'
 
 
-class ItemViewSet(viewsets.ModelViewSet):
+class ItemViewSet(ModelViewSet):
     """
     API endpoint to list, retrieve, create, update and destroy agenda items.
     """
-    model = Item
+    queryset = Item.objects.all()
     serializer_class = ItemSerializer
 
     def check_permissions(self, request):
@@ -807,7 +807,7 @@ class ItemViewSet(viewsets.ModelViewSet):
         """
         Filters organizational items if the user has no permission to see them.
         """
-        queryset = Item.objects.all()
+        queryset = super().get_queryset()
         if not self.request.user.has_perm('agenda.can_see_orga_items'):
             queryset = queryset.exclude(type__exact=Item.ORGANIZATIONAL_ITEM)
         return queryset
diff --git a/openslides/assignment/serializers.py b/openslides/assignment/serializers.py
index 61d836131..b3cbfb4ea 100644
--- a/openslides/assignment/serializers.py
+++ b/openslides/assignment/serializers.py
@@ -1,4 +1,4 @@
-from openslides.utils.rest_api import serializers
+from openslides.utils.rest_api import ListSerializer, ModelSerializer
 
 from .models import (
     models,
@@ -9,7 +9,7 @@ from .models import (
     AssignmentVote)
 
 
-class AssignmentRelatedUserSerializer(serializers.ModelSerializer):
+class AssignmentRelatedUserSerializer(ModelSerializer):
     """
     Serializer for assignment.models.AssignmentRelatedUser objects.
     """
@@ -21,7 +21,7 @@ class AssignmentRelatedUserSerializer(serializers.ModelSerializer):
             'status')
 
 
-class AssignmentVoteSerializer(serializers.ModelSerializer):
+class AssignmentVoteSerializer(ModelSerializer):
     """
     Serializer for assignment.models.AssignmentVote objects.
     """
@@ -30,7 +30,7 @@ class AssignmentVoteSerializer(serializers.ModelSerializer):
         fields = ('weight', 'value',)
 
 
-class AssignmentOptionSerializer(serializers.ModelSerializer):
+class AssignmentOptionSerializer(ModelSerializer):
     """
     Serializer for assignment.models.AssignmentOption objects.
     """
@@ -41,7 +41,7 @@ class AssignmentOptionSerializer(serializers.ModelSerializer):
         fields = ('candidate', 'assignmentvote_set',)
 
 
-class FilterPollListSerializer(serializers.ListSerializer):
+class FilterPollListSerializer(ListSerializer):
     """
     Customized serializer to filter polls (exclude unpublished).
     """
@@ -57,7 +57,7 @@ class FilterPollListSerializer(serializers.ListSerializer):
         return [self.child.to_representation(item) for item in iterable]
 
 
-class AssignmentAllPollSerializer(serializers.ModelSerializer):
+class AssignmentAllPollSerializer(ModelSerializer):
     """
     Serializer for assignment.models.AssignmentPoll objects.
 
@@ -98,7 +98,7 @@ class AssignmentShortPollSerializer(AssignmentAllPollSerializer):
             'votescast',)
 
 
-class AssignmentFullSerializer(serializers.ModelSerializer):
+class AssignmentFullSerializer(ModelSerializer):
     """
     Serializer for assignment.models.Assignment objects. With all polls.
     """
diff --git a/openslides/assignment/views.py b/openslides/assignment/views.py
index ed3e98480..3c4e9aae8 100644
--- a/openslides/assignment/views.py
+++ b/openslides/assignment/views.py
@@ -14,7 +14,7 @@ from openslides.config.api import config
 from openslides.users.models import Group, User  # TODO: remove this
 from openslides.poll.views import PollFormView
 from openslides.utils.pdf import stylesheet
-from openslides.utils.rest_api import viewsets
+from openslides.utils.rest_api import ModelViewSet
 from openslides.utils.utils import html_strong
 from openslides.utils.views import (CreateView, DeleteView, DetailView,
                                     ListView, PDFView,
@@ -215,11 +215,10 @@ class AssignmentDeleteCandidateshipOtherView(SingleObjectMixin, QuestionView):
         return _("Candidate %s was withdrawn successfully.") % html_strong(self.user)
 
 
-class AssignmentViewSet(viewsets.ModelViewSet):
+class AssignmentViewSet(ModelViewSet):
     """
     API endpoint to list, retrieve, create, update and destroy assignments.
     """
-    model = Assignment
     queryset = Assignment.objects.all()
 
     def check_permissions(self, request):
diff --git a/openslides/config/views.py b/openslides/config/views.py
index 104de6f14..5fd7c8859 100644
--- a/openslides/config/views.py
+++ b/openslides/config/views.py
@@ -4,7 +4,7 @@ from django.core.urlresolvers import reverse
 from django.http import Http404
 from django.utils.translation import ugettext as _
 
-from openslides.utils.rest_api import response, viewsets
+from openslides.utils.rest_api import Response, ViewSet
 from openslides.utils.views import FormView
 
 from .api import config
@@ -105,7 +105,7 @@ class ConfigView(FormView):
         return super(ConfigView, self).form_valid(form)
 
 
-class ConfigViewSet(viewsets.ViewSet):
+class ConfigViewSet(ViewSet):
     """
     API endpoint to list, retrieve and update the config.
     """
@@ -115,7 +115,7 @@ class ConfigViewSet(viewsets.ViewSet):
         """
         # TODO: Check if we need permission check here.
         data = ({'key': key, 'value': value} for key, value in config.items())
-        return response.Response(data)
+        return Response(data)
 
     def retrieve(self, request, *args, **kwargs):
         """
@@ -127,7 +127,7 @@ class ConfigViewSet(viewsets.ViewSet):
             data = {'key': key, 'value': config[key]}
         except ConfigNotFound:
             raise Http404
-        return response.Response(data)
+        return Response(data)
 
     def update(self, request, pk=None):
         """
diff --git a/openslides/core/serializers.py b/openslides/core/serializers.py
index 0af4676da..30e0ae83d 100644
--- a/openslides/core/serializers.py
+++ b/openslides/core/serializers.py
@@ -1,9 +1,9 @@
-from openslides.utils.rest_api import serializers
+from openslides.utils.rest_api import ModelSerializer
 
 from .models import CustomSlide, Tag
 
 
-class CustomSlideSerializer(serializers.ModelSerializer):
+class CustomSlideSerializer(ModelSerializer):
     """
     Serializer for core.models.CustomSlide objects.
     """
@@ -12,7 +12,7 @@ class CustomSlideSerializer(serializers.ModelSerializer):
         fields = ('id', 'title', 'text', 'weight',)
 
 
-class TagSerializer(serializers.ModelSerializer):
+class TagSerializer(ModelSerializer):
     """
     Serializer for core.models.Tag objects.
     """
diff --git a/openslides/core/views.py b/openslides/core/views.py
index 45fd3f86b..36e7fea7c 100644
--- a/openslides/core/views.py
+++ b/openslides/core/views.py
@@ -16,7 +16,7 @@ from openslides import get_git_commit_id, RELEASE
 from openslides.config.api import config
 from openslides.utils import views as utils_views
 from openslides.utils.plugins import get_plugin_description, get_plugin_verbose_name, get_plugin_version
-from openslides.utils.rest_api import viewsets
+from openslides.utils.rest_api import ModelViewSet
 from openslides.utils.signals import template_manipulation
 from openslides.utils.widgets import Widget
 
@@ -235,11 +235,10 @@ class CustomSlideDeleteView(CustomSlideViewMixin, utils_views.DeleteView):
     pass
 
 
-class CustomSlideViewSet(viewsets.ModelViewSet):
+class CustomSlideViewSet(ModelViewSet):
     """
     API endpoint to list, retrieve, create, update and destroy custom slides.
     """
-    model = CustomSlide
     queryset = CustomSlide.objects.all()
     serializer_class = CustomSlideSerializer
 
@@ -330,11 +329,10 @@ class TagListView(utils_views.AjaxMixin, utils_views.ListView):
             **context)
 
 
-class TagViewSet(viewsets.ModelViewSet):
+class TagViewSet(ModelViewSet):
     """
     API endpoint to list, retrieve, create, update and destroy tags.
     """
-    model = Tag
     queryset = Tag.objects.all()
     serializer_class = TagSerializer
 
diff --git a/openslides/mediafile/serializers.py b/openslides/mediafile/serializers.py
index 0189127f3..db2c9a074 100644
--- a/openslides/mediafile/serializers.py
+++ b/openslides/mediafile/serializers.py
@@ -1,13 +1,13 @@
-from openslides.utils.rest_api import serializers
+from openslides.utils.rest_api import ModelSerializer, SerializerMethodField
 
 from .models import Mediafile
 
 
-class MediafileSerializer(serializers.ModelSerializer):
+class MediafileSerializer(ModelSerializer):
     """
     Serializer for mediafile.models.Mediafile objects.
     """
-    filesize = serializers.SerializerMethodField()
+    filesize = SerializerMethodField()
 
     class Meta:
         model = Mediafile
diff --git a/openslides/mediafile/views.py b/openslides/mediafile/views.py
index 1491180f1..6e6c87404 100644
--- a/openslides/mediafile/views.py
+++ b/openslides/mediafile/views.py
@@ -2,7 +2,7 @@ from django.http import HttpResponse
 
 from openslides.config.api import config
 from openslides.projector.api import get_active_slide
-from openslides.utils.rest_api import viewsets
+from openslides.utils.rest_api import ModelViewSet
 from openslides.utils.views import (AjaxView, CreateView, DeleteView, RedirectView, ListView,
                                     UpdateView)
 
@@ -202,12 +202,11 @@ class PdfToggleFullscreenView(RedirectView):
         return {'fullscreen': config['pdf_fullscreen']}
 
 
-class MediafileViewSet(viewsets.ModelViewSet):
+class MediafileViewSet(ModelViewSet):
     """
     API endpoint to list, retrieve, create, update and destroy mediafile
     objects.
     """
-    model = Mediafile
     queryset = Mediafile.objects.all()
     serializer_class = MediafileSerializer
 
diff --git a/openslides/motion/serializers.py b/openslides/motion/serializers.py
index 5829f7683..d8566aedd 100644
--- a/openslides/motion/serializers.py
+++ b/openslides/motion/serializers.py
@@ -1,4 +1,4 @@
-from openslides.utils.rest_api import serializers
+from openslides.utils.rest_api import ModelSerializer, PrimaryKeyRelatedField, SerializerMethodField
 
 from .models import (
     Category,
@@ -14,7 +14,7 @@ from .models import (
     Workflow,)
 
 
-class CategorySerializer(serializers.ModelSerializer):
+class CategorySerializer(ModelSerializer):
     """
     Serializer for motion.models.Category objects.
     """
@@ -23,7 +23,7 @@ class CategorySerializer(serializers.ModelSerializer):
         fields = ('id', 'name', 'prefix',)
 
 
-class StateSerializer(serializers.ModelSerializer):
+class StateSerializer(ModelSerializer):
     """
     Serializer for motion.models.State objects.
     """
@@ -44,19 +44,19 @@ class StateSerializer(serializers.ModelSerializer):
             'next_states',)
 
 
-class WorkflowSerializer(serializers.ModelSerializer):
+class WorkflowSerializer(ModelSerializer):
     """
     Serializer for motion.models.Workflow objects.
     """
     state_set = StateSerializer(many=True, read_only=True)
-    first_state = serializers.PrimaryKeyRelatedField(read_only=True)
+    first_state = PrimaryKeyRelatedField(read_only=True)
 
     class Meta:
         model = Workflow
         fields = ('id', 'name', 'state_set', 'first_state',)
 
 
-class MotionSubmitterSerializer(serializers.ModelSerializer):
+class MotionSubmitterSerializer(ModelSerializer):
     """
     Serializer for motion.models.MotionSubmitter objects.
     """
@@ -65,7 +65,7 @@ class MotionSubmitterSerializer(serializers.ModelSerializer):
         fields = ('person',)  # TODO: Rename this to 'user', see #1348
 
 
-class MotionSupporterSerializer(serializers.ModelSerializer):
+class MotionSupporterSerializer(ModelSerializer):
     """
     Serializer for motion.models.MotionSupporter objects.
     """
@@ -74,7 +74,7 @@ class MotionSupporterSerializer(serializers.ModelSerializer):
         fields = ('person',)  # TODO: Rename this to 'user', see #1348
 
 
-class MotionLogSerializer(serializers.ModelSerializer):
+class MotionLogSerializer(ModelSerializer):
     """
     Serializer for motion.models.MotionLog objects.
     """
@@ -83,7 +83,7 @@ class MotionLogSerializer(serializers.ModelSerializer):
         fields = ('message_list', 'person', 'time',)
 
 
-class MotionVoteSerializer(serializers.ModelSerializer):
+class MotionVoteSerializer(ModelSerializer):
     """
     Serializer for motion.models.MotionVote objects.
     """
@@ -92,7 +92,7 @@ class MotionVoteSerializer(serializers.ModelSerializer):
         fields = ('value', 'weight',)
 
 
-class MotionOptionSerializer(serializers.ModelSerializer):
+class MotionOptionSerializer(ModelSerializer):
     """
     Serializer for motion.models.MotionOption objects.
     """
@@ -103,7 +103,7 @@ class MotionOptionSerializer(serializers.ModelSerializer):
         fields = ('motionvote_set',)
 
 
-class MotionPollSerializer(serializers.ModelSerializer):
+class MotionPollSerializer(ModelSerializer):
     """
     Serializer for motion.models.MotionPoll objects.
     """
@@ -119,7 +119,7 @@ class MotionPollSerializer(serializers.ModelSerializer):
             'votescast',)
 
 
-class MotionVersionSerializer(serializers.ModelSerializer):
+class MotionVersionSerializer(ModelSerializer):
     """
     Serializer for motion.models.MotionVersion objects.
     """
@@ -134,16 +134,16 @@ class MotionVersionSerializer(serializers.ModelSerializer):
             'reason',)
 
 
-class MotionSerializer(serializers.ModelSerializer):
+class MotionSerializer(ModelSerializer):
     """
     Serializer for motion.models.Motion objects.
     """
     versions = MotionVersionSerializer(many=True, read_only=True)
-    active_version = serializers.PrimaryKeyRelatedField(read_only=True)
+    active_version = PrimaryKeyRelatedField(read_only=True)
     submitter = MotionSubmitterSerializer(many=True, read_only=True)
     supporter = MotionSupporterSerializer(many=True, read_only=True)
     state = StateSerializer(read_only=True)
-    workflow = serializers.SerializerMethodField()
+    workflow = SerializerMethodField()
     polls = MotionPollSerializer(many=True, read_only=True)
     log_messages = MotionLogSerializer(many=True, read_only=True)
 
diff --git a/openslides/motion/views.py b/openslides/motion/views.py
index 489c56b92..e7f215f19 100644
--- a/openslides/motion/views.py
+++ b/openslides/motion/views.py
@@ -10,7 +10,7 @@ from django.shortcuts import get_object_or_404
 from openslides.agenda.views import CreateRelatedAgendaItemView as _CreateRelatedAgendaItemView
 from openslides.config.api import config
 from openslides.poll.views import PollFormView
-from openslides.utils.rest_api import viewsets
+from openslides.utils.rest_api import ModelViewSet
 from openslides.utils.utils import html_strong, htmldiff
 from openslides.utils.views import (CreateView, CSVImportView, DeleteView, DetailView,
                                     ListView, PDFView, QuestionView,
@@ -539,11 +539,10 @@ class SupportView(SingleObjectMixin, QuestionView):
             return _("You have unsupported this motion successfully.")
 
 
-class MotionViewSet(viewsets.ModelViewSet):
+class MotionViewSet(ModelViewSet):
     """
     API endpoint to list, retrieve, create, update and destroy motions.
     """
-    model = Motion
     queryset = Motion.objects.all()
     serializer_class = MotionSerializer
 
@@ -840,11 +839,10 @@ class CategoryDeleteView(DeleteView):
     success_url_name = 'motion_category_list'
 
 
-class CategoryViewSet(viewsets.ModelViewSet):
+class CategoryViewSet(ModelViewSet):
     """
     API endpoint to list, retrieve, create, update and destroy categories.
     """
-    model = Category
     queryset = Category.objects.all()
     serializer_class = CategorySerializer
 
@@ -886,11 +884,10 @@ class MotionCSVImportView(CSVImportView):
         return super(CSVImportView, self).form_valid(form)
 
 
-class WorkflowViewSet(viewsets.ModelViewSet):
+class WorkflowViewSet(ModelViewSet):
     """
     API endpoint to list, retrieve, create, update and destroy workflows.
     """
-    model = Workflow
     queryset = Workflow.objects.all()
     serializer_class = WorkflowSerializer
 
diff --git a/openslides/users/serializers.py b/openslides/users/serializers.py
index 7e1729b9d..0e8e12983 100644
--- a/openslides/users/serializers.py
+++ b/openslides/users/serializers.py
@@ -1,9 +1,9 @@
-from openslides.utils.rest_api import serializers
+from openslides.utils.rest_api import ModelSerializer, RelatedField
 
 from .models import Group, User  # TODO: Don't import Group from models but from core.models.
 
 
-class UserShortSerializer(serializers.ModelSerializer):
+class UserShortSerializer(ModelSerializer):
     """
     Serializer for users.models.User objects.
 
@@ -21,7 +21,7 @@ class UserShortSerializer(serializers.ModelSerializer):
             'groups',)
 
 
-class UserFullSerializer(serializers.ModelSerializer):
+class UserFullSerializer(ModelSerializer):
     """
     Serializer for users.models.User objects.
 
@@ -45,7 +45,7 @@ class UserFullSerializer(serializers.ModelSerializer):
             'is_active',)
 
 
-class PermissionRelatedField(serializers.RelatedField):
+class PermissionRelatedField(RelatedField):
     """
     A custom field to use for the permission relationship.
     """
@@ -56,7 +56,7 @@ class PermissionRelatedField(serializers.RelatedField):
         return '.'.join((value.content_type.app_label, value.codename,))
 
 
-class GroupSerializer(serializers.ModelSerializer):
+class GroupSerializer(ModelSerializer):
     """
     Serializer for django.contrib.auth.models.Group objects.
     """
diff --git a/openslides/users/views.py b/openslides/users/views.py
index 4f3ecdfcc..b20090a32 100644
--- a/openslides/users/views.py
+++ b/openslides/users/views.py
@@ -6,7 +6,7 @@ from django.core.urlresolvers import reverse
 from django.utils.translation import ugettext as _, ugettext_lazy, activate
 
 from openslides.config.api import config
-from openslides.utils.rest_api import viewsets
+from openslides.utils.rest_api import ModelViewSet
 from openslides.utils.utils import delete_default_permissions, html_strong
 from openslides.utils.views import (
     CreateView, CSVImportView, DeleteView, DetailView, FormView, ListView,
@@ -261,11 +261,10 @@ class ResetPasswordView(SingleObjectMixin, QuestionView):
         return _('The Password for %s was successfully reset.') % html_strong(self.get_object())
 
 
-class UserViewSet(viewsets.ModelViewSet):
+class UserViewSet(ModelViewSet):
     """
     API endpoint to list, retrieve, create, update and delete users.
     """
-    model = User
     queryset = User.objects.all()
 
     def check_permissions(self, request):
@@ -291,11 +290,10 @@ class UserViewSet(viewsets.ModelViewSet):
         return serializer_class
 
 
-class GroupViewSet(viewsets.ModelViewSet):
+class GroupViewSet(ModelViewSet):
     """
     API endpoint to list, retrieve, create, update and delete groups.
     """
-    model = Group
     queryset = Group.objects.all()
     serializer_class = GroupSerializer
 
diff --git a/openslides/utils/rest_api.py b/openslides/utils/rest_api.py
index 262774042..a01657a4d 100644
--- a/openslides/utils/rest_api.py
+++ b/openslides/utils/rest_api.py
@@ -3,11 +3,20 @@ import re
 from urllib.parse import urlparse
 
 from django.core.urlresolvers import reverse
-from rest_framework import response, routers, serializers, viewsets  # noqa
+from rest_framework.serializers import (  # noqa
+    CharField,
+    ListSerializer,
+    ModelSerializer,
+    PrimaryKeyRelatedField,
+    RelatedField,
+    SerializerMethodField)
+from rest_framework.response import Response  # noqa
+from rest_framework.routers import DefaultRouter
+from rest_framework.viewsets import ModelViewSet, ViewSet  # noqa
 
 from .exceptions import OpenSlidesError
 
-router = routers.DefaultRouter()
+router = DefaultRouter()
 
 
 class RESTModelMixin:
diff --git a/requirements_production.txt b/requirements_production.txt
index 19c9fc499..8f12db506 100644
--- a/requirements_production.txt
+++ b/requirements_production.txt
@@ -5,7 +5,7 @@ bleach>=1.4,<1.5
 django-ckeditor-updated>=4.2.3,<4.4
 django-haystack>=2.1,<2.4
 django-mptt>=0.6,<0.7
-djangorestframework>=3.0.1,<3.0.5
+djangorestframework>=3.0.5,<3.1.0
 jsonfield>=0.9.19,<1.1
 natsort>=3.2,<3.6
 reportlab>=3.0,<3.2