django技巧

1，return其他views（注意代码段里面的星号）

def index(request):
    category_list = Category.objects.order_by('-likes')[:5]
    page_list = Page.objects.order_by('-views')[:5]

    ...

    response = render(request, 'rango/index.html', context_dict)
    return response

def add_category(request):
    if request.method == 'POST':
        form = CategoryForm(request.POST)

        if form.is_valid():
            form.save(commit=True)
            **return index(request)**
        else:
            print form.errors
    else:
        form = CategoryForm()

    return render(request, 'rango/add_category.html', {'form': form})

2，HiddenInput

forms.py

class PageFrom(forms.ModelForm):
    title = forms.CharField(max_length=128, help_text="Please enter the title of the page.")
    url = forms.URLField(max_length=200, help_text="Please enter the URL of the page.")
    views = forms.IntegerField(widget=forms.HiddenInput(), initial=0)

    class Meta:
        model = Page

        exclude = ('category',)

    def clean(self):
        cleaned_data = self.cleaned_data
        url = cleaned_data.get('url')

        # If url is not empty and doesn't start with 'http://', prepend 'http://'.
        if url and not url.startswith('http://'):
            url = 'http://' + url
            cleaned_data['url'] = url

        return cleaned_data

tempalte

        <form id="category_form" method="post" action="/rango/add_category/">

            {% csrf_token %}
            {% for hidden in form.hidden_fields %}
                {{ hidden }}
            {% endfor %}

            {% for field in form.visible_fields %}
                {{ field.errors }}
                {{ field.help_text }}
                {{ field }}
            {% endfor %}

            <input type="submit" name="submit" value="Create Category" />
        </form>

3,templatetags

app_name/templatetags/***_extras.py

from django import template
from rango.models import Category

register = template.Library()
# 等于include的时候带上了query set等数据
@register.inclusion_tag('rango/cats.html')
def get_category_list():
    return {'cats': Category.objects.all()}

template

{# import #}
{% load "***_extras" %}
{# use #}
{% get_category_list %}