django search page not found error

[omid jahadi]

Hello everybody! I want to search in a ManyToManyField in the DetailView. It works fine if a user with the same query exist, but if there isn't a user, i get page not found error.

models.py:

class agents(models.Model):
    agent_type = models.ForeignKey(types, on_delete=models.SET_NULL, blank=True, null=True)
    name = models.CharField(max_length=100)
    users = models.ManyToManyField(user_models.users, through='user_agent')

views.py:

class AgentDetailView(LoginRequiredMixin, generic.DetailView):
    model = models.agents
    template_name = 'agent/agent_detail.html'

    def get_queryset(self):
        query = self.request.GET.get('q')
        if query:
            return models.agents.objects.filter(Q(users__user__first_name__contains=query)
                                                | Q(users__user__last_name__contains=query)
                                                | Q(users__id_number__contains=query)
                                                | Q(users__mobile__contains=query))
        else:
            return models.agents.objects.all()

agent_detail.html:

<h1>name: {{ agents.name }}</h1>
    <form method="GET" action="" id="searchform">
        <input class="searchfield" id="searchbox" name="q" type="text" placeholder="Search..."/>
        <button name="search" type="submit" value="{{ request.GET.q }}">Search</button>
    </form>
    {% if agents.users %}
        <p><strong>Users:</strong>
            <br>
            {% for users in agents.users.all %}
                <li>{{ users }}</li>
                <hr>
            {% endfor %}
        </p>
    {% else %}
        <p>There are no user for this agent in database.</p>
    {% endif %}

[Motaz Hejaze]

Add null=True to manytomany field

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[omid jahadi]

It doesn't work ... Actually, ManyToManyField is not null ... I get error when i search a keyword that doesn't match with any user! ... For example, first_name is 'Omid', when i search 'o' or 'm', search works fine and return 'Omid', but, when i search 'k', i get PageNotFound error

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[Motaz Hejaze]

No problem , you can catch this exception in your views.py if you want ..

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[omid jahadi]

How can i handle this exception ... I have this error: "No agents found matching the query"

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