WIP: workaround "'PKOnlyObject' object has no attribute" error for toOne related

.pyup.yml

@@ -0,0 +1,5 @@
+search: False
+requirements:
+  - requirements-development.txt:
+      update: all
+      pin: True

.travis.yml

@@ -1,8 +1,17 @@
 language: python
-sudo: false
+sudo: required
 cache: pip
 # Favor explicit over implicit and use an explicit build matrix.
 matrix:
+  allow_failures:
+    - env: TOXENV=py34-df20-django20-drfmaster
+    - env: TOXENV=py35-df20-django20-drfmaster
+    - env: TOXENV=py36-df20-django20-drfmaster
+    - env: TOXENV=py37-df20-django20-drfmaster
+    - env: TOXENV=py35-df20-django21-drfmaster
+    - env: TOXENV=py36-df20-django21-drfmaster
+    - env: TOXENV=py37-df20-django21-drfmaster
+
   include:
     - python: 3.6
       env: TOXENV=flake8
@@ -13,6 +22,8 @@ matrix:
       env: TOXENV=py27-df11-django111-drf37
     - python: 2.7
       env: TOXENV=py27-df11-django111-drf38
+    - python: 2.7
+      env: TOXENV=py27-df11-django111-drf39
 
     - python: 3.4
       env: TOXENV=py34-df20-django111-drf36
@@ -24,6 +35,10 @@ matrix:
       env: TOXENV=py34-df20-django20-drf37
     - python: 3.4
       env: TOXENV=py34-df20-django20-drf38
+    - python: 3.4
+      env: TOXENV=py34-df20-django20-drf39
+    - python: 3.4
+      env: TOXENV=py34-df20-django20-drfmaster
 
     - python: 3.5
       env: TOXENV=py35-df20-django111-drf36
@@ -35,6 +50,14 @@ matrix:
       env: TOXENV=py35-df20-django20-drf37
     - python: 3.5
       env: TOXENV=py35-df20-django20-drf38
+    - python: 3.5
+      env: TOXENV=py35-df20-django20-drf39
+    - python: 3.5
+      env: TOXENV=py35-df20-django20-drfmaster
+    - python: 3.5
+      env: TOXENV=py35-df20-django21-drf39
+    - python: 3.5
+      env: TOXENV=py35-df20-django21-drfmaster
 
     - python: 3.6
       env: TOXENV=py36-df20-django111-drf36
@@ -46,6 +69,31 @@ matrix:
       env: TOXENV=py36-df20-django20-drf37
     - python: 3.6
       env: TOXENV=py36-df20-django20-drf38
+    - python: 3.6
+      env: TOXENV=py36-df20-django20-drf39
+    - python: 3.6
+      env: TOXENV=py36-df20-django20-drfmaster
+    - python: 3.6
+      env: TOXENV=py36-df20-django21-drf39
+    - python: 3.6
+      env: TOXENV=py36-df20-django21-drfmaster
+
+    - python: 3.7
+      dist: xenial
+      sudo: required
+      env: TOXENV=py37-df20-django20-drf39
+    - python: 3.7
+      dist: xenial
+      sudo: required
+      env: TOXENV=py37-df20-django20-drfmaster
+    - python: 3.7
+      dist: xenial
+      sudo: required
+      env: TOXENV=py37-df20-django21-drf39
+    - python: 3.7
+      dist: xenial
+      sudo: required
+      env: TOXENV=py37-df20-django21-drfmaster
 install:
   - pip install tox
 script:

CHANGELOG.md

@@ -13,13 +13,17 @@ any parts of the framework not mentioned in the documentation should generally b
 
 ### Added
 
+* Add support for Django 2.1, DRF 3.9 and Python 3.7. Please note:
+  - Django >= 2.1 is not supported with Python < 3.5.
+
 ### Deprecated
 
 ### Changed
 
 ### Fixed
 
 * Pass context from `PolymorphicModelSerializer` to child serializers to support fields which require a `request` context such as `url`.
+* Avoid patch on `RelationshipView` deleting relationship instance when constraint would allow null ([#242](https://github.com/django-json-api/django-rest-framework-json-api/issues/242))
 
 
 ## [2.6.0] - 2018-09-20

README.rst

@@ -87,9 +87,9 @@ As a Django REST Framework JSON API (short DJA) we are trying to address followi
 Requirements
 ------------
 
-1. Python (2.7, 3.4, 3.5, 3.6)
-2. Django (1.11, 2.0)
-3. Django REST Framework (3.6, 3.7, 3.8)
+1. Python (2.7, 3.4, 3.5, 3.6, 3.7)
+2. Django (1.11, 2.0, 2.1)
+3. Django REST Framework (3.6, 3.7, 3.8, 3.9)
 
 ------------
 Installation
@@ -116,12 +116,18 @@ From Source
 Running the example app
 ^^^^^^^^^^^^^^^^^^^^^^^
 
+It is recommended to create a virtualenv for testing. Assuming it is already
+installed and activated:
+
 ::
 
     $ git clone https://github.com/django-json-api/django-rest-framework-json-api.git
     $ cd django-rest-framework-json-api
+    $ pip install -r example/requirements.txt
     $ pip install -e .
-    $ django-admin.py runserver --settings=example.settings
+    $ django-admin migrate --settings=example.settings
+    $ django-admin loaddata drf_example --settings=example.settings
+    $ django-admin runserver --settings=example.settings
 
 Browse to http://localhost:8000
 
@@ -136,7 +142,7 @@ installed and activated:
 
     $ pip install -r requirements-development.txt
     $ flake8
-    $ py.test
+    $ pytest
 
 -----
 Usage

docs/getting-started.md

@@ -51,9 +51,9 @@ like the following:
 
 ## Requirements
 
-1. Python (2.7, 3.4, 3.5, 3.6)
-2. Django (1.11, 2.0)
-3. Django REST Framework (3.6, 3.7, 3.8)
+1. Python (2.7, 3.4, 3.5, 3.6, 3.7)
+2. Django (1.11, 2.0, 2.1)
+3. Django REST Framework (3.6, 3.7, 3.8, 3.9)
 
 ## Installation