Merge pull request #49 from cloudblue/LITE-24280_support_get_rql_filter_class

LITE-24280: Add support for get_rql_filter_class() in views

Author: maxipavlovic

Diff for: dj_rql/drf/backend.py

@@ -22,10 +22,26 @@ def clear(cls):
 class RQLFilterBackend(BaseFilterBackend):
     """ RQL filter backend for DRF GenericAPIViews.
 
-    Examples:
+    Set the backend filter for the ``GenericAPIView`` class-based view, and set the
+    ``rql_filter_class`` class attribute to the ``RQLFilterClass`` to use:
+
+    .. code-block:: python
+
         class ViewSet(mixins.ListModelMixin, GenericViewSet):
             filter_backends = (RQLFilterBackend,)
             rql_filter_class = ModelFilterClass
+
+    Yo can also add a ``get_rql_filter_class()`` method to the view to get the filter class:
+
+    .. code-block:: python
+
+        class ViewSet(mixins.ListModelMixin, mixins.RetrieveModelMixin, GenericViewSet):
+            filter_backends = (RQLFilterBackend,)
+
+            def get_rql_filter_class(self):
+                if self.action == 'retrieve':
+                    return ModelDetailFilterClass
+                return ModelFilterClass
     """
     OPENAPI_RETRIEVE_SPECIFICATION = False
 
@@ -85,6 +101,8 @@ def get_schema_operation_parameters(self, view):
 
     @staticmethod
     def get_filter_class(view):
+        if hasattr(view, 'get_rql_filter_class') and callable(view.get_rql_filter_class):
+            return view.get_rql_filter_class()
         return getattr(view, 'rql_filter_class', None)
 
     @classmethod
@@ -93,14 +111,14 @@ def get_query(cls, filter_instance, request, view):
 
     @classmethod
     def _get_or_init_cache(cls, filter_class, view):
-        qual_name = cls._get_filter_cls_qual_name(view)
+        qual_name = cls._get_filter_cls_qual_name(view, filter_class)
         return cls._CACHES.setdefault(
             qual_name, filter_class.QUERIES_CACHE_BACKEND(int(filter_class.QUERIES_CACHE_SIZE)),
         )
 
     @classmethod
     def _get_filter_instance(cls, filter_class, queryset, view):
-        qual_name = cls._get_filter_cls_qual_name(view)
+        qual_name = cls._get_filter_cls_qual_name(view, filter_class)
 
         filter_instance = _FilterClassCache.CACHE.get(qual_name)
         if filter_instance:
@@ -111,5 +129,8 @@ def _get_filter_instance(cls, filter_class, queryset, view):
         return filter_instance
 
     @staticmethod
-    def _get_filter_cls_qual_name(view):
-        return '{0}.{1}'.format(view.__class__.__module__, view.__class__.__name__)
+    def _get_filter_cls_qual_name(view, filter_class):
+        return '{0}.{1}+{2}.{3}'.format(
+            view.__class__.__module__, view.__class__.__name__,
+            filter_class.__module__, filter_class.__name__,
+        )

Diff for: setup.py

@@ -26,7 +26,7 @@ def read_file(name):
     include_package_data=True,
     install_requires=read_file('requirements/dev.txt').splitlines(),
     tests_require=read_file('requirements/test.txt').splitlines(),
-    setup_requires=['setuptools_scm', 'pytest-runner', 'wheel'],
+    setup_requires=['setuptools_scm<7', 'pytest-runner', 'wheel'],
     extras_require={
         'drf': read_file('requirements/extra.txt').splitlines(),
     },

Diff for: tests/dj_rf/filters.py

@@ -1,6 +1,8 @@
 #
 #  Copyright © 2022 Ingram Micro Inc. All rights reserved.
 #
+from copy import deepcopy
+
 from cachetools import LFUCache, LRUCache
 
 from dj_rql.fields import SelectField
@@ -48,6 +50,7 @@ class BooksFilterClass(RQLFilterClass):
         'openapi': {
             'required': True,
         },
+        'hidden': True,
     }, {
         'filter': 'author__email',
         'search': True,
@@ -67,6 +70,7 @@ class BooksFilterClass(RQLFilterClass):
         'filters': AUTHOR_FILTERS,
         'distinct': True,
         'qs': SR('author', 'author__publisher'),
+        'hidden': True,
     }, {
         'namespace': 'page',
         'source': 'pages',
@@ -89,6 +93,7 @@ class BooksFilterClass(RQLFilterClass):
         'filter': 'amazon_rating',
         'lookups': {FilterLookups.GE, FilterLookups.LT},
         'null_values': {'random'},
+        'hidden': True,
     }, {
         'filter': 'url',
         'source': 'publishing_url',
@@ -196,3 +201,15 @@ class SelectBooksFilterClass(BooksFilterClass):
     SELECT = True
     QUERIES_CACHE_BACKEND = LRUCache
     QUERIES_CACHE_SIZE = 100
+
+
+class SelectDetailedBooksFilterClass(SelectBooksFilterClass):
+
+    def __make_filters():
+        result = deepcopy(BooksFilterClass.FILTERS)
+        result[4]['hidden'] = False  # status
+        result[7]['hidden'] = False  # author
+        result[12]['hidden'] = False  # amazon_rating
+        return result
+
+    FILTERS = __make_filters()

Diff for: tests/dj_rf/serializers.py

@@ -1,5 +1,5 @@
 #
-#  Copyright © 2021 Ingram Micro Inc. All rights reserved.
+#  Copyright © 2022 Ingram Micro Inc. All rights reserved.
 #
 
 from dj_rql.drf.serializers import RQLMixin
@@ -68,6 +68,8 @@ class Meta:
             'author_ref',  # One level reference field (FK)
             'author',  # Deep nested fields (FK)
             'pages',  # List of backrefs
+            'status',
+            'amazon_rating',
         )
 
     def get_author(self, obj):

Diff for: tests/dj_rf/urls.py

@@ -1,5 +1,5 @@
 #
-#  Copyright © 2021 Ingram Micro Inc. All rights reserved.
+#  Copyright © 2022 Ingram Micro Inc. All rights reserved.
 #
 
 from django.conf.urls import include
@@ -8,7 +8,8 @@
 from rest_framework.routers import SimpleRouter
 
 from tests.dj_rf.view import (
-    AutoViewSet, DRFViewSet, DjangoFiltersViewSet, NoFilterClsViewSet, SelectViewSet,
+    AutoViewSet, DRFViewSet, DjangoFiltersViewSet, DynamicFilterClsViewSet, NoFilterClsViewSet,
+    SelectViewSet,
 )
 
 
@@ -18,6 +19,7 @@
 router.register(r'select', SelectViewSet, basename='select')
 router.register(r'nofiltercls', NoFilterClsViewSet, basename='nofiltercls')
 router.register(r'auto', AutoViewSet, basename='auto')
+router.register(r'dynamicfiltercls', DynamicFilterClsViewSet, basename='dynamicfiltercls')
 
 urlpatterns = [
     re_path(r'^', include(router.urls)),

Diff for: tests/dj_rf/view.py

@@ -1,5 +1,5 @@
 #
-#  Copyright © 2021 Ingram Micro Inc. All rights reserved.
+#  Copyright © 2022 Ingram Micro Inc. All rights reserved.
 #
 
 from dj_rql.drf.backend import RQLFilterBackend
@@ -14,7 +14,9 @@
 from rest_framework.response import Response
 from rest_framework.viewsets import GenericViewSet
 
-from tests.dj_rf.filters import BooksFilterClass, SelectBooksFilterClass
+from tests.dj_rf.filters import (
+    BooksFilterClass, SelectBooksFilterClass, SelectDetailedBooksFilterClass,
+)
 from tests.dj_rf.models import Book
 from tests.dj_rf.serializers import BookSerializer, SelectBookSerializer
 
@@ -56,6 +58,15 @@ class SelectViewSet(mixins.RetrieveModelMixin, DRFViewSet):
     rql_filter_class = SelectBooksFilterClass
 
 
+class DynamicFilterClsViewSet(mixins.RetrieveModelMixin, DRFViewSet):
+    serializer_class = SelectBookSerializer
+
+    def get_rql_filter_class(self):
+        if self.action == 'retrieve':
+            return SelectDetailedBooksFilterClass
+        return SelectBooksFilterClass
+
+
 class NoFilterClsViewSet(DRFViewSet):
     rql_filter_class = None
 

Diff for: tests/test_drf/test_common_drf_backend.py

@@ -1,5 +1,5 @@
 #
-#  Copyright © 2021 Ingram Micro Inc. All rights reserved.
+#  Copyright © 2022 Ingram Micro Inc. All rights reserved.
 #
 from cachetools import LFUCache, LRUCache
 
@@ -12,7 +12,7 @@
 import pytest
 
 from rest_framework.reverse import reverse
-from rest_framework.status import HTTP_200_OK
+from rest_framework.status import HTTP_200_OK, HTTP_404_NOT_FOUND
 
 from tests.dj_rf.models import Book
 
@@ -103,7 +103,7 @@ def test_filter_cls_cache(api_client, clear_cache):
     response = api_client.get('{0}?{1}'.format(reverse('book-list'), 'title=F'))
     assert response.data == [{'id': books[0].pk}]
 
-    expected_cache_key = 'tests.dj_rf.view.DRFViewSet'
+    expected_cache_key = 'tests.dj_rf.view.DRFViewSet+tests.dj_rf.filters.BooksFilterClass'
     assert expected_cache_key in _FilterClassCache.CACHE
     cache_item_id = id(_FilterClassCache.CACHE[expected_cache_key])
 
@@ -117,6 +117,42 @@ def test_filter_cls_cache(api_client, clear_cache):
     assert _FilterClassCache.CACHE == {}
 
 
+@pytest.mark.django_db
+def test_dynamic_filter_cls_cache(api_client, clear_cache):
+    books = [
+        Book.objects.create(title='F'),
+        Book.objects.create(title='G'),
+    ]
+
+    list_cache_key = '{0}+{1}'.format(
+        'tests.dj_rf.view.DynamicFilterClsViewSet',
+        'tests.dj_rf.filters.SelectBooksFilterClass',
+    )
+    detail_cache_key = '{0}+{1}'.format(
+        'tests.dj_rf.view.DynamicFilterClsViewSet',
+        'tests.dj_rf.filters.SelectDetailedBooksFilterClass',
+    )
+
+    assert _FilterClassCache.CACHE == {}
+
+    api_client.get('{0}?{1}'.format(reverse('dynamicfiltercls-list'), 'title=F'))
+    assert list_cache_key in _FilterClassCache.CACHE
+
+    list_cache_item_id = id(_FilterClassCache.CACHE[list_cache_key])
+    api_client.get('{0}?{1}'.format(reverse('dynamicfiltercls-list'), 'title=G'))
+    assert len(_FilterClassCache.CACHE) == 1
+    assert id(_FilterClassCache.CACHE[list_cache_key]) == list_cache_item_id
+
+    api_client.get(reverse('dynamicfiltercls-detail', [books[0].pk]))
+    assert len(_FilterClassCache.CACHE) == 2
+    assert detail_cache_key in _FilterClassCache.CACHE
+
+    detail_cache_item_id = id(_FilterClassCache.CACHE[detail_cache_key])
+    api_client.get(reverse('dynamicfiltercls-detail', [books[1].pk]))
+    assert len(_FilterClassCache.CACHE) == 2
+    assert id(_FilterClassCache.CACHE[detail_cache_key]) == detail_cache_item_id
+
+
 @pytest.mark.django_db
 def test_query_cache(api_client, clear_cache, django_assert_num_queries):
     books = [
@@ -136,13 +172,45 @@ def test_query_cache(api_client, clear_cache, django_assert_num_queries):
         assert response.status_code == HTTP_200_OK
         assert 'id' not in response.data[0]
 
+        response = api_client.get('{0}?{1}'.format(reverse('dynamicfiltercls-list'), 'title=F'))
+        assert response.data[0]['id'] == books[0].pk
+
+        response = api_client.get(reverse('dynamicfiltercls-list') + '?select(author)')
+        assert len(response.data) == 2
+
+        response = api_client.get('{0}?{1}'.format(reverse('dynamicfiltercls-list'), 'title=X'))
+        assert response.data == []
+
+        response = api_client.get(reverse('dynamicfiltercls-detail', [books[0].pk]))
+        assert response.data['id'] == books[0].pk
+
+        response = api_client.get(reverse('dynamicfiltercls-detail', ['non-exists']))
+        assert response.status_code == HTTP_404_NOT_FOUND
+
     caches = RQLFilterBackend._CACHES
-    assert isinstance(caches['tests.dj_rf.view.DRFViewSet'], LFUCache)
-    assert caches['tests.dj_rf.view.DRFViewSet'].currsize == 2
-    assert caches['tests.dj_rf.view.DRFViewSet'].maxsize == 20
-    assert isinstance(caches['tests.dj_rf.view.SelectViewSet'], LRUCache)
-    assert caches['tests.dj_rf.view.SelectViewSet'].currsize == 1
-    assert caches['tests.dj_rf.view.SelectViewSet'].maxsize == 100
+    cache = caches['tests.dj_rf.view.DRFViewSet+tests.dj_rf.filters.BooksFilterClass']
+    assert isinstance(cache, LFUCache)
+    assert cache.currsize == 2
+    assert cache.maxsize == 20
+
+    cache = caches['tests.dj_rf.view.SelectViewSet+tests.dj_rf.filters.SelectBooksFilterClass']
+    assert isinstance(cache, LRUCache)
+    assert cache.currsize == 1
+    assert cache.maxsize == 100
+
+    cache = caches[
+        'tests.dj_rf.view.DynamicFilterClsViewSet'
+        '+tests.dj_rf.filters.SelectBooksFilterClass'
+    ]
+    assert isinstance(cache, LRUCache)
+    assert cache.currsize == 3
+
+    cache = caches[
+        'tests.dj_rf.view.DynamicFilterClsViewSet'
+        '+tests.dj_rf.filters.SelectDetailedBooksFilterClass'
+    ]
+    assert isinstance(cache, LRUCache)
+    assert cache.currsize == 1
 
 
 @pytest.mark.django_db

Diff for: tests/test_drf/test_dynamic_filter.py

@@ -0,0 +1,72 @@
+#
+#  Copyright © 2022 Ingram Micro Inc. All rights reserved.
+#
+
+import pytest
+
+from rest_framework.reverse import reverse
+from rest_framework.status import HTTP_200_OK
+
+from tests.dj_rf.models import Author, Book, Publisher
+
+
+@pytest.mark.django_db
+def test_detail_default(api_client, clear_cache):
+    publisher = Publisher.objects.create(name='publisher')
+    author = Author.objects.create(name='auth', publisher=publisher)
+    book = Book.objects.create(author=author, status=Book.PLANNING, amazon_rating=5.0)
+
+    response = api_client.get(reverse('dynamicfiltercls-detail', [book.pk]))
+
+    assert response.status_code == HTTP_200_OK
+    assert 'author' in response.data
+    assert 'status' in response.data
+    assert 'amazon_rating' in response.data
+
+
+@pytest.mark.django_db
+def test_detail_exclude_fields(api_client, clear_cache):
+    publisher = Publisher.objects.create(name='publisher')
+    author = Author.objects.create(name='auth', publisher=publisher)
+    book = Book.objects.create(author=author, status=Book.PLANNING, amazon_rating=5.0)
+
+    response = api_client.get(
+        reverse('dynamicfiltercls-detail', [book.pk])
+        + '?select(-author,-status,-amazon_rating)',
+    )
+
+    assert response.status_code == HTTP_200_OK
+    assert 'author' not in response.data
+    assert 'status' not in response.data
+    assert 'amazon_rating' not in response.data
+
+
+@pytest.mark.django_db
+def test_list_default(api_client, clear_cache):
+    publisher = Publisher.objects.create(name='publisher')
+    author = Author.objects.create(name='auth', publisher=publisher)
+    Book.objects.create(author=author, status=Book.PLANNING, amazon_rating=5.0)
+
+    response = api_client.get(reverse('dynamicfiltercls-list'))
+
+    assert response.status_code == HTTP_200_OK
+    assert 'author' not in response.data[0]
+    assert 'status' not in response.data[0]
+    assert 'amazon_rating' not in response.data[0]
+
+
+@pytest.mark.django_db
+def test_list_include_fields(api_client, clear_cache):
+    publisher = Publisher.objects.create(name='publisher')
+    author = Author.objects.create(name='auth', publisher=publisher)
+    Book.objects.create(author=author, status=Book.PLANNING, amazon_rating=5.0)
+
+    response = api_client.get(
+        reverse('dynamicfiltercls-list')
+        + '?select(author,status,amazon_rating)',
+    )
+
+    assert response.status_code == HTTP_200_OK
+    assert 'author' in response.data[0]
+    assert 'status' in response.data[0]
+    assert 'amazon_rating' in response.data[0]