Return 如果 DRF 和 Django 过滤器中没有提供过滤，则为空页面
Return Empty Page if There's No Filtering Provided in DRF and Django Filters
我有一个 ViewSet 如下：
class EntryViewSet(viewsets.ModelViewSet):
queryset = Entry.objects.all()
serializer_class = EntrySerializer
filter_backends = [DjangoFilterBackend, OrderingFilter]
filterset_class = EntryFilterSet
ordering_fields = ["created_at", "last_update"]
ordering = "created_at"
...和一个 FilterSet 定义了我可以过滤的几个字段：
class EntryFilterSet(django_filters.FilterSet):
class Meta:
model = models.Entry
fields = [
"content",
# and other fields
]
我已使用 DRF 的 DefaultRouter 将我的 EntryViewSet 连接到 /api/entries/，列表视图自动命名为 api:entry-list。
所以，/api/entries/ returns:
{
"count": 100,
"next": "http://localhost:8000/api/entries/?format=json&p=2",
"previous": null,
"results": [
{
"pk": "6Kqpyak",
"created_at": "2021-10-13T13:28:17.410883Z",
"last_update": "2021-10-13T13:28:17.410898Z",
"content": "Start investment begin nice feeling. Travel sea mind teacher could. Within act series effort crime.",
"content_html": "<p>Start investment begin nice feeling. Travel sea mind teacher could. Within act series effort crime.</p>",
"author": 1,
"title": {
"pk": "6Kqpyak",
"created_at": "2021-10-13T13:28:17.408026Z",
"label": "republican attack computer recently though guy.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:17.416822Z"
}
},
{
"pk": "1ozyMzx",
"created_at": "2021-10-13T13:28:17.532635Z",
"last_update": "2021-10-13T13:28:17.532649Z",
"content": "School establish partner. Establish possible who let. Impact health exactly particular note.",
"content_html": "<p>School establish partner. Establish possible who let. Impact health exactly particular note.</p>",
"author": 2,
"title": {
"pk": "1ozyMzx",
"created_at": "2021-10-13T13:28:17.531007Z",
"label": "produce six while act.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:17.535188Z"
}
},
{
"pk": "RJ2Ypz6",
"created_at": "2021-10-13T13:28:17.649090Z",
"last_update": "2021-10-13T13:28:17.649102Z",
"content": "Later doctor nearly somebody threat contain. System most citizen surface hand. Whatever behind administration reflect.",
"content_html": "<p>Later doctor nearly somebody threat contain. System most citizen surface hand. Whatever behind administration reflect.</p>",
"author": 3,
"title": {
"pk": "RJ2Ypz6",
"created_at": "2021-10-13T13:28:17.647544Z",
"label": "man family inside free room project around federal.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:17.651709Z"
}
},
{
"pk": "Z52x9q6",
"created_at": "2021-10-13T13:28:17.766830Z",
"last_update": "2021-10-13T13:28:17.766843Z",
"content": "Event more prepare more paper why. Shake represent carry easy.",
"content_html": "<p>Event more prepare more paper why. Shake represent carry easy.</p>",
"author": 4,
"title": {
"pk": "Z52x9q6",
"created_at": "2021-10-13T13:28:17.765145Z",
"label": "within make check seat provide street enough could.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:17.769486Z"
}
},
{
"pk": "RGqd8qp",
"created_at": "2021-10-13T13:28:17.883725Z",
"last_update": "2021-10-13T13:28:17.883738Z",
"content": "Out imagine school. Service will authority decision.",
"content_html": "<p>Out imagine school. Service will authority decision.</p>",
"author": 5,
"title": {
"pk": "RGqd8qp",
"created_at": "2021-10-13T13:28:17.882053Z",
"label": "have seek letter data operation of.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:17.886221Z"
}
},
{
"pk": "oVaDYzL",
"created_at": "2021-10-13T13:28:18.000127Z",
"last_update": "2021-10-13T13:28:18.000140Z",
"content": "Effect hear budget involve hand. Southern skin eight degree marriage hit. Management explain finish young.",
"content_html": "<p>Effect hear budget involve hand. Southern skin eight degree marriage hit. Management explain finish young.</p>",
"author": 6,
"title": {
"pk": "oVaDYzL",
"created_at": "2021-10-13T13:28:17.998689Z",
"label": "edge could official raise it social.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.002121Z"
}
},
{
"pk": "Qw2Abq5",
"created_at": "2021-10-13T13:28:18.115996Z",
"last_update": "2021-10-13T13:28:18.116009Z",
"content": "Entire avoid fill view buy those. Activity fund woman.",
"content_html": "<p>Entire avoid fill view buy those. Activity fund woman.</p>",
"author": 7,
"title": {
"pk": "Qw2Abq5",
"created_at": "2021-10-13T13:28:18.114276Z",
"label": "three never hold free power camera plan.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.118433Z"
}
},
{
"pk": "mOz79q9",
"created_at": "2021-10-13T13:28:18.232557Z",
"last_update": "2021-10-13T13:28:18.232570Z",
"content": "Their wrong man prepare participant seek exist. Cause political white year early far arrive. Step during bring result book. Idea off each hotel.",
"content_html": "<p>Their wrong man prepare participant seek exist. Cause political white year early far arrive. Step during bring result book. Idea off each hotel.</p>",
"author": 8,
"title": {
"pk": "mOz79q9",
"created_at": "2021-10-13T13:28:18.231008Z",
"label": "high boy customer continue.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.235055Z"
}
},
{
"pk": "odq0Pqp",
"created_at": "2021-10-13T13:28:18.349485Z",
"last_update": "2021-10-13T13:28:18.349499Z",
"content": "Sport hard writer suddenly officer head. Stand ok standard if some natural.",
"content_html": "<p>Sport hard writer suddenly officer head. Stand ok standard if some natural.</p>",
"author": 9,
"title": {
"pk": "odq0Pqp",
"created_at": "2021-10-13T13:28:18.347777Z",
"label": "professor sign kid today.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.351944Z"
}
},
{
"pk": "Pyz9ezE",
"created_at": "2021-10-13T13:28:18.467119Z",
"last_update": "2021-10-13T13:28:18.467133Z",
"content": "Account control arm example edge world.",
"content_html": "<p>Account control arm example edge world.</p>",
"author": 10,
"title": {
"pk": "Pyz9ezE",
"created_at": "2021-10-13T13:28:18.465434Z",
"label": "ago current politics direction happy.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.469393Z"
}
},
{
"pk": "jV2mGay",
"created_at": "2021-10-13T13:28:18.583407Z",
"last_update": "2021-10-13T13:28:18.583420Z",
"content": "Soldier street deal which become rather most interesting. Involve job brother become race. Former who then better per eight garden. Particular reduce easy report physical study edge.",
"content_html": "<p>Soldier street deal which become rather most interesting. Involve job brother become race. Former who then better per eight garden. Particular reduce easy report physical study edge.</p>",
"author": 11,
"title": {
"pk": "jV2mGay",
"created_at": "2021-10-13T13:28:18.581806Z",
"label": "else free reason there ask morning good east.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.585613Z"
}
},
{
"pk": "Qeqe5q1",
"created_at": "2021-10-13T13:28:18.700883Z",
"last_update": "2021-10-13T13:28:18.700911Z",
"content": "Option exactly call speech. Kitchen sport build collection talk.",
"content_html": "<p>Option exactly call speech. Kitchen sport build collection talk.</p>",
"author": 12,
"title": {
"pk": "Qeqe5q1",
"created_at": "2021-10-13T13:28:18.698691Z",
"label": "race someone senior.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.703568Z"
}
},
{
"pk": "QEq8Yam",
"created_at": "2021-10-13T13:28:18.818029Z",
"last_update": "2021-10-13T13:28:18.818043Z",
"content": "Billion development something usually condition big high. Teacher trip pick religious decide report ground.",
"content_html": "<p>Billion development something usually condition big high. Teacher trip pick religious decide report ground.</p>",
"author": 13,
"title": {
"pk": "QEq8Yam",
"created_at": "2021-10-13T13:28:18.816374Z",
"label": "guess present provide rate stage door cold.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.820609Z"
}
},
{
"pk": "93qOXaN",
"created_at": "2021-10-13T13:28:18.934904Z",
"last_update": "2021-10-13T13:28:18.934918Z",
"content": "From Democrat rock pretty great former. Continue expert success perhaps. Conference she live interview know.",
"content_html": "<p>From Democrat rock pretty great former. Continue expert success perhaps. Conference she live interview know.</p>",
"author": 14,
"title": {
"pk": "93qOXaN",
"created_at": "2021-10-13T13:28:18.933225Z",
"label": "during full executive require.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.937446Z"
}
},
{
"pk": "pg2Enqy",
"created_at": "2021-10-13T13:28:19.053488Z",
"last_update": "2021-10-13T13:28:19.053502Z",
"content": "Election memory security make address morning campaign. Whom may hear can.",
"content_html": "<p>Election memory security make address morning campaign. Whom may hear can.</p>",
"author": 15,
"title": {
"pk": "pg2Enqy",
"created_at": "2021-10-13T13:28:19.051383Z",
"label": "discover picture trade against huge dinner bill so.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:19.056058Z"
}
},
{
"pk": "YgaR3zl",
"created_at": "2021-10-13T13:28:19.170756Z",
"last_update": "2021-10-13T13:28:19.170770Z",
"content": "Live politics pull card choose project. Right say share security.",
"content_html": "<p>Live politics pull card choose project. Right say share security.</p>",
"author": 16,
"title": {
"pk": "YgaR3zl",
"created_at": "2021-10-13T13:28:19.169057Z",
"label": "usually mention down interest fast simple.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:19.173290Z"
}
},
{
"pk": "Evzryax",
"created_at": "2021-10-13T13:28:19.287340Z",
"last_update": "2021-10-13T13:28:19.287354Z",
"content": "Challenge do drop this. Data follow including.",
"content_html": "<p>Challenge do drop this. Data follow including.</p>",
"author": 17,
"title": {
"pk": "Evzryax",
"created_at": "2021-10-13T13:28:19.285621Z",
"label": "behind how for call go particular democratic area.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:19.289753Z"
}
},
{
"pk": "Jo2bn29",
"created_at": "2021-10-13T13:28:19.404715Z",
"last_update": "2021-10-13T13:28:19.404729Z",
"content": "Great drug water military game second choose item. Real soldier system energy south child itself. Contain throw attention cup support suddenly piece.",
"content_html": "<p>Great drug water military game second choose item. Real soldier system energy south child itself. Contain throw attention cup support suddenly piece.</p>",
"author": 18,
"title": {
"pk": "Jo2bn29",
"created_at": "2021-10-13T13:28:19.403005Z",
"label": "back record region poor in class room.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:19.407063Z"
}
},
{
"pk": "7OzXkan",
"created_at": "2021-10-13T13:28:19.522027Z",
"last_update": "2021-10-13T13:28:19.522040Z",
"content": "Increase firm machine. Fast learn expert indeed center young per.",
"content_html": "<p>Increase firm machine. Fast learn expert indeed center young per.</p>",
"author": 19,
"title": {
"pk": "7OzXkan",
"created_at": "2021-10-13T13:28:19.520464Z",
"label": "small even scene worker involve few.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:19.524342Z"
}
},
{
"pk": "rAaZVaj",
"created_at": "2021-10-13T13:28:19.638963Z",
"last_update": "2021-10-13T13:28:19.638977Z",
"content": "Sport Republican image on make third. Process particular support chair very share few important. Man war apply position cultural science hundred.",
"content_html": "<p>Sport Republican image on make third. Process particular support chair very share few important. Man war apply position cultural science hundred.</p>",
"author": 20,
"title": {
"pk": "rAaZVaj",
"created_at": "2021-10-13T13:28:19.637345Z",
"label": "like western natural theory right audience four.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:19.641106Z"
}
}
]
}
...过滤也有效。但是，这不是我想要的行为。如果没有提供过滤，我希望此端点 return 一个空页面。如下所示：
{
"count": 0,
"next": "http://localhost:8000/api/entries/?format=json&p=2",
"previous": null,
"results": []
}
我怎样才能实现这种行为？
环境
- django ^2.2
- djangorest 框架 ^3.12.4
- django 过滤器 ^21.1
由于过滤适用于 URL 参数，您可以检查它们。如果它们是空的，您可以 return 一个空的查询集。
您可以在 get_queryset 和 ModelViewSet 上实现此行为。只需重写方法如下：
def get_queryset(self):
if not bool(self.request.GET):
return Entry.objects.none()
return Entry.objects.all()
不过请记住，这会检查 URL 参数是否为空。如果您出于其他原因使用 URL 参数，这可能会导致意外行为。
我有一个 ViewSet 如下：
class EntryViewSet(viewsets.ModelViewSet):
queryset = Entry.objects.all()
serializer_class = EntrySerializer
filter_backends = [DjangoFilterBackend, OrderingFilter]
filterset_class = EntryFilterSet
ordering_fields = ["created_at", "last_update"]
ordering = "created_at"
...和一个 FilterSet 定义了我可以过滤的几个字段：
class EntryFilterSet(django_filters.FilterSet):
class Meta:
model = models.Entry
fields = [
"content",
# and other fields
]
我已使用 DRF 的 DefaultRouter 将我的 EntryViewSet 连接到 /api/entries/，列表视图自动命名为 api:entry-list。
所以，/api/entries/ returns:
{
"count": 100,
"next": "http://localhost:8000/api/entries/?format=json&p=2",
"previous": null,
"results": [
{
"pk": "6Kqpyak",
"created_at": "2021-10-13T13:28:17.410883Z",
"last_update": "2021-10-13T13:28:17.410898Z",
"content": "Start investment begin nice feeling. Travel sea mind teacher could. Within act series effort crime.",
"content_html": "<p>Start investment begin nice feeling. Travel sea mind teacher could. Within act series effort crime.</p>",
"author": 1,
"title": {
"pk": "6Kqpyak",
"created_at": "2021-10-13T13:28:17.408026Z",
"label": "republican attack computer recently though guy.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:17.416822Z"
}
},
{
"pk": "1ozyMzx",
"created_at": "2021-10-13T13:28:17.532635Z",
"last_update": "2021-10-13T13:28:17.532649Z",
"content": "School establish partner. Establish possible who let. Impact health exactly particular note.",
"content_html": "<p>School establish partner. Establish possible who let. Impact health exactly particular note.</p>",
"author": 2,
"title": {
"pk": "1ozyMzx",
"created_at": "2021-10-13T13:28:17.531007Z",
"label": "produce six while act.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:17.535188Z"
}
},
{
"pk": "RJ2Ypz6",
"created_at": "2021-10-13T13:28:17.649090Z",
"last_update": "2021-10-13T13:28:17.649102Z",
"content": "Later doctor nearly somebody threat contain. System most citizen surface hand. Whatever behind administration reflect.",
"content_html": "<p>Later doctor nearly somebody threat contain. System most citizen surface hand. Whatever behind administration reflect.</p>",
"author": 3,
"title": {
"pk": "RJ2Ypz6",
"created_at": "2021-10-13T13:28:17.647544Z",
"label": "man family inside free room project around federal.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:17.651709Z"
}
},
{
"pk": "Z52x9q6",
"created_at": "2021-10-13T13:28:17.766830Z",
"last_update": "2021-10-13T13:28:17.766843Z",
"content": "Event more prepare more paper why. Shake represent carry easy.",
"content_html": "<p>Event more prepare more paper why. Shake represent carry easy.</p>",
"author": 4,
"title": {
"pk": "Z52x9q6",
"created_at": "2021-10-13T13:28:17.765145Z",
"label": "within make check seat provide street enough could.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:17.769486Z"
}
},
{
"pk": "RGqd8qp",
"created_at": "2021-10-13T13:28:17.883725Z",
"last_update": "2021-10-13T13:28:17.883738Z",
"content": "Out imagine school. Service will authority decision.",
"content_html": "<p>Out imagine school. Service will authority decision.</p>",
"author": 5,
"title": {
"pk": "RGqd8qp",
"created_at": "2021-10-13T13:28:17.882053Z",
"label": "have seek letter data operation of.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:17.886221Z"
}
},
{
"pk": "oVaDYzL",
"created_at": "2021-10-13T13:28:18.000127Z",
"last_update": "2021-10-13T13:28:18.000140Z",
"content": "Effect hear budget involve hand. Southern skin eight degree marriage hit. Management explain finish young.",
"content_html": "<p>Effect hear budget involve hand. Southern skin eight degree marriage hit. Management explain finish young.</p>",
"author": 6,
"title": {
"pk": "oVaDYzL",
"created_at": "2021-10-13T13:28:17.998689Z",
"label": "edge could official raise it social.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.002121Z"
}
},
{
"pk": "Qw2Abq5",
"created_at": "2021-10-13T13:28:18.115996Z",
"last_update": "2021-10-13T13:28:18.116009Z",
"content": "Entire avoid fill view buy those. Activity fund woman.",
"content_html": "<p>Entire avoid fill view buy those. Activity fund woman.</p>",
"author": 7,
"title": {
"pk": "Qw2Abq5",
"created_at": "2021-10-13T13:28:18.114276Z",
"label": "three never hold free power camera plan.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.118433Z"
}
},
{
"pk": "mOz79q9",
"created_at": "2021-10-13T13:28:18.232557Z",
"last_update": "2021-10-13T13:28:18.232570Z",
"content": "Their wrong man prepare participant seek exist. Cause political white year early far arrive. Step during bring result book. Idea off each hotel.",
"content_html": "<p>Their wrong man prepare participant seek exist. Cause political white year early far arrive. Step during bring result book. Idea off each hotel.</p>",
"author": 8,
"title": {
"pk": "mOz79q9",
"created_at": "2021-10-13T13:28:18.231008Z",
"label": "high boy customer continue.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.235055Z"
}
},
{
"pk": "odq0Pqp",
"created_at": "2021-10-13T13:28:18.349485Z",
"last_update": "2021-10-13T13:28:18.349499Z",
"content": "Sport hard writer suddenly officer head. Stand ok standard if some natural.",
"content_html": "<p>Sport hard writer suddenly officer head. Stand ok standard if some natural.</p>",
"author": 9,
"title": {
"pk": "odq0Pqp",
"created_at": "2021-10-13T13:28:18.347777Z",
"label": "professor sign kid today.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.351944Z"
}
},
{
"pk": "Pyz9ezE",
"created_at": "2021-10-13T13:28:18.467119Z",
"last_update": "2021-10-13T13:28:18.467133Z",
"content": "Account control arm example edge world.",
"content_html": "<p>Account control arm example edge world.</p>",
"author": 10,
"title": {
"pk": "Pyz9ezE",
"created_at": "2021-10-13T13:28:18.465434Z",
"label": "ago current politics direction happy.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.469393Z"
}
},
{
"pk": "jV2mGay",
"created_at": "2021-10-13T13:28:18.583407Z",
"last_update": "2021-10-13T13:28:18.583420Z",
"content": "Soldier street deal which become rather most interesting. Involve job brother become race. Former who then better per eight garden. Particular reduce easy report physical study edge.",
"content_html": "<p>Soldier street deal which become rather most interesting. Involve job brother become race. Former who then better per eight garden. Particular reduce easy report physical study edge.</p>",
"author": 11,
"title": {
"pk": "jV2mGay",
"created_at": "2021-10-13T13:28:18.581806Z",
"label": "else free reason there ask morning good east.",
"redirects_to": null,
"recent_count": 0,
"last_update": "2021-10-13T13:28:18.585613Z"
}
},
{
"pk": "Qeqe5q1",
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"content": "Sport Republican image on make third. Process particular support chair very share few important. Man war apply position cultural science hundred.",
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...过滤也有效。但是，这不是我想要的行为。如果没有提供过滤，我希望此端点 return 一个空页面。如下所示：
{
"count": 0,
"next": "http://localhost:8000/api/entries/?format=json&p=2",
"previous": null,
"results": []
}
我怎样才能实现这种行为？
环境
- django ^2.2
- djangorest 框架 ^3.12.4
- django 过滤器 ^21.1
由于过滤适用于 URL 参数，您可以检查它们。如果它们是空的，您可以 return 一个空的查询集。
您可以在 get_queryset 和 ModelViewSet 上实现此行为。只需重写方法如下：
def get_queryset(self):
if not bool(self.request.GET):
return Entry.objects.none()
return Entry.objects.all()
不过请记住，这会检查 URL 参数是否为空。如果您出于其他原因使用 URL 参数，这可能会导致意外行为。