Django中链接无法正常工作

Question

<a href = "{% url 'ngraph' %}">Customer Count</a>

当我点击顾客计数时，它只能工作一次，要使其工作，我必须重新运行程序，这里有什么问题？我注意到的是，一旦点击了链接localhost:8000/graph（顾客计数），它会工作但会让localhost:8000忙碌，并且该链接无法工作。如何解决？

views.py

def graph(request):
    age = ['below 20', '20-22','22-24','24-26','26-28','28-30','30-40','above 40']
    avg_call_group =  [0, 0, 0, 0, 0, 0, 0, 0]

    cursor = connection.cursor()
    cursor.execute("select p.age_group,sum(c.avg_duration) as age_avg_dur from demo p,(select  card_no as card_n, avg(duration) as avg_duration from call_details where service_key = 1 and card_no =calling_no group by card_no) as c where p.card_no = c.card_n group by p.age_group ")
    numrows = int(cursor.rowcount)
    for x in range(numrows):
        row = cursor.fetchone()
        avg_call_group[x] =  row[1]

    cursor.close()

    import matplotlib.pyplot as plt
    f=plt.figure(figsize = (3,3))
    exploding = [.04, .04, .04, .04 , .04, .04, .04, .04]
    age = ['below 20', '20-22','22-24','24-26','26-28','28-30','30-40','40-50']
    plt.pie(avg_call_group, labels= age, autopct='%1.3f%%', explode = exploding)
    canvas = FigureCanvasAgg(f)
    response = HttpResponse(content_type='image/png')
    canvas.print_png(response)
    return response

urls.py

from django.conf.urls import patterns, include, url
from welcome.views import *
from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns('',
    url(r'^admin/', include(admin.site.urls)),
    url(r'^hello/', hello, name = 'nhello'),
    url(r'^graph/', graph, name = 'ngraph'),
)

home.html

<div >
<a href = "{% url 'ngraph' %}">Customer Count</a>
</div>

备用代码位置： 点击这里

- Bishnu Bhattarai

---

你已经禁用了浏览器缓存吗？https://dev59.com/l3I95IYBdhLWcg3w7CfL - dwxw

测试也是同样的工作方式吗？ - oleg

可能是链接调用的视图抛出了异常，导致服务器崩溃。您能访问服务器日志/输出吗？ - DRC

你没有在上下文中发送回响应。 - karthikr

@DRC 是的，我已经访问了服务器日志/输出，但是不知道发生了什么事情。 - Bishnu Bhattarai

Answer 1

在您的视图代码中返回时进行重定向。类似以下内容：-

return render_to_response('graph.html', context_instance=RequestContext(request))

- Nikhil

Answer 2

我不知道你是否还需要答案，但我是这样解决了相同的问题:

matplotlib.use('Agg') # After you import


# And these lines at the end

fig.clf()
plt.close()
plt.clf()
del var_grid
gc.collect()

- Murat Ayan