在我的多向图中,我想找到 2 个节点之间可能的所有(简单)路径。我设法获得了所有路径,但无法区分源节点到达目标节点所需的边(假设它是一个多向图)。
例如,我有 A->B->C,其中 (A,B) 和 (B,C) 之间有多个平行边。如果我说 A->B 有 5 条平行边,B->C 有 2 条平行边,则 all_simple_path(graph, source='A', target='C') 将总共返回 7 条路径,全部为课程 A->B->C
使用 get_edge_data() 时,它返回每个节点之间的所有平行边。但我想要的是能够列出路径中指定节点采用的所有组合边。
谢谢 !
我是 Django REST 框架的新手。我尝试做的是在 HTML 中呈现 Generic APIView (RetrieveUpdateDestroyAPIView),类似于在 Browsable API 中自动呈现 ViewSet 的方式。
按照官方文档,我在 myApp/ views.py中有:
class AnnounceViewSet(viewsets.ModelViewSet):
"""
API endpoint that allows announces to be viewed or edited.
"""
queryset = Announce.objects.all()
serializer_class = AnnounceSerializer
permission_classes = (permissions.IsAuthenticatedOrReadOnly,
IsOwnerOrReadOnly,)
def perform_create(self, serializer): # without this, the POST request of the announce doesnt work
serializer.save(owner=self.request.user)
class AnnounceList(APIView):
renderer_classes = [TemplateHTMLRenderer]
template_name = 'myApp/announces_list.html'
permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
def get(self, request):
queryset = Announce.objects.all()
return Response({'announces': queryset})
class …Run Code Online (Sandbox Code Playgroud) 所以,我想测试mapStateToProps,并mapDispatchToProps与酶/玩笑。
我有一个像这样的DrawerAvatar组件:
DrawerAvatar.js
const mapStateToProps = state => ({
isAuthenticated: state.authReducer.isAuthenticated
});
export default compose(
connect(mapStateToProps, null)
)(DrawerAvatar);
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DrawerAvatar.test.js
import configureMockStore from 'redux-mock-store';
import connectedDrawerAvatar, { DrawerAvatar } from './DrawerAvatar';
const mockStore = configureMockStore();
it('mapStateToProps should return the right value', () => {
const initialState = {
someState: 123
};
const store = mockStore(initialState);
const wrapper = shallow(<connectedDrawerAvatar store={store} />);
expect(wrapper.props().someState).toBe(123);
});
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但是,这不起作用,因为会wrapper.props().someState返回undefined...因此,我不知道如何使用连接的组件来测试mapStatesToProps和redux-mock-store。
我也不知道怎么测试mapDispatchToProps ..!我已经尝试了此博客中提供的方法,但是它不起作用。
非常感谢你 !
编辑:这有效,但是我不确定它是否真的测试 …
尝试显示用户的所有Announce对象时出现问题.我的问题是:考虑我以id = 1的用户身份登录.当我去/ users/1 /它显示我的所有帖子.但问题是当我想通过转到/ users/2 /来显示id = 2的其他用户的所有帖子时,它仍然显示我的所有Announce对象,而不是id = 2的用户.
models.py
class Announce(models.Model):
owner = models.ForeignKey('auth.User', related_name='announces')
created_date = models.DateTimeField(auto_now_add=True)
body = models.TextField(max_length=1000)
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views.py
class UserAnnouncesList(ListView):
model = Announce
template_name = 'myApp/user_announces_list.html'
context_object_name = 'all_announces_by_user'
def get_queryset(self):
return Announce.objects.filter(owner=self.request.user)
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urls.py
urlpatterns = [
url(r'users/(?P<pk>[0-9]+)/$', views.UserAnnouncesList.as_view(), name='user_announces_list'),]
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user_announces_list.html
{% extends "account/base.html" %}
{% block content %}
{% for announce in all_announces_by_user %}
<h1>{{announce.user.username}}</h1>
<p>{{announce.body}}</p>
{% endfor %}
{% endblock content %}
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我是否必须使用某种类似的:Announce.objects.get(pk = ???)?
我感谢您的帮助!
python django listview django-queryset django-related-manager