CODEWITHSUNDEEP
djangodjango-viewsdjango-templatesdjango-urls
Gabriel Ferrante
Gabriel Ferrante

Reputation: 73

Page previous in Detail View for Detail View - Django

I'm have a page Detail View with a button with link for Detail View. But like the url need a PK, i cannot set PK per be a Detail View. How can I define a url for the previous page without the PK ?

In Template

<button id="botaoVoltar" type="submit" class="mb-10 btn btn-light"><a href="{% url 'relatorio' ??? %}">Voltar</a> </button>

In urls

path('relatorios/relatorio/<int:pk>', RelatorioView.as_view(), name='relatorio')

Exception:

NoReverseMatch Exception Value:  
Reverse for 'relatorio' with no arguments not found. 1 pattern(s) tried: ['relatorios/relatorio/(?P[0-9]+)$']

Upvotes: 1

Views: 87

Answers (1)

willeM_ Van Onsem
willeM_ Van Onsem

Reputation: 476729

You can define a method to look up the previous object:

class RelatorioView(DetailView):
    # …
    def get_previous(self):
        return self.get_queryset().filter(
            pk__lt=self.object.pk
        ).order_by('-pk').first()

Next we can use that to obtain the previous one:

{% with prev=view.get_previous %}
{% if prev %}
    <button id="botaoVoltar" type="submit" class="mb-10 btn btn-light">
        <a href="{% url 'relatorio' prev.pk %}">Voltar</a>
    </button>
{% endif %}

Upvotes: 1

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