我有一个模型表单集,我想使用 Django 的 Paginator 一次显示 10 个表单,但不能像paginator = Paginator(formset, 10). 如果有办法,这样做的正确方法是什么?
5 回答
这是我发现的问题解决方案的一个通用示例:
在forms.py文件中:
class MyForm(ModelForm):
    class Meta:
        model = MyModel
        fields = ('description',)
在views.py文件中:
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
FormSet = modelformset_factory(MyModel, form=MyForm, extra=0)
if request.method == 'POST':
    formset = FormSet(request.POST, request.FILES)
    # Your validation and rest of the 'POST' code
else:
    query = MyModel.objects.filter(condition)
    paginator = Paginator(query, 10) # Show 10 forms per page
    page = request.GET.get('page')
    try:
        objects = paginator.page(page)
    except PageNotAnInteger:
        objects = paginator.page(1)
    except EmptyPage:
        objects = paginator.page(paginator.num_pages)
    page_query = query.filter(id__in=[object.id for object in objects])
    formset = FormSet(queryset=page_query)
    context = {'objects': objects, 'formset': formset}
    return render_to_response('template.html', context,
                              context_instance=RequestContext(request))
您需要使用当前页面中的对象创建表单集,否则,当您尝试formset = FormSet(request.POST, request.FILES)在 POST 方法中执行时,Django 会引发 MultiValueDictKeyError 错误。
在template.html文件中:
{% if objects %}
    <form action="" method="post">
        {% csrf_token %}
        {{ formset.management_form }}
        {% for form in formset.forms %}
            {{ form.id }}
            <!-- Display each form -->
            {{ form.as_p }}
        {% endfor %}
        <input type="submit" value="Save" />
    </form>
    <div class="pagination">
        <span class="step-links">
            {% if objects.has_previous %}
                <a href="?page={{ objects.previous_page_number }}">Previous</a>
            {% endif %}
            <span class="current">
                Page {{ objects.number }} of {{ objects.paginator.num_pages }}
            </span>
            {% if objects.has_next %}
                <a href="?page={{ objects.next_page_number }}">next</a>
            {% endif %}
        </span>
    </div>
{% else %}
    <p>There are no objects.</p>
{% endif %}
一个更优雅的解决方案是ordered=True在Page对象上设置,以便可以将其传递给ModelFormSet.
这是一个例子:
forms_per_page = 10
current_page = 1
ModelFormSet = modelformset_factory(MyModel, form=MyForm)
queryset = MyModel.objects.all()
paginator = Paginator(queryset, forms_per_page)
page_object = paginator.page(current_page)
page_object.ordered = True
form = ModelFormSet(queryset=page_object)
这比接受的答案更有效,因为避免了在该行中发生的第二个数据库查询:
page_query = query.filter(id__in=[object.id for object in objects])
更正确的使用方法
...
formset = FormSet(queryset=page_query.object_list)
...
这里的问题是您在Page期望 a 的上下文中使用品牌 (a ) QuerySet。所以,我们需要那个该死的QuerySet. 您的方法正确,但代码很多。
在源代码中,我们有:
class Page(collections.Sequence):
    def __init__(self, object_list, number, paginator):
        self.object_list = object_list
        self.number = number
        self.paginator = paginator
        ...
所以,我们的查询集在self.object_list属性中,只需使用它!
formset = SomeModelFormSet(queryset=objects.object_list)
同意Elrond 支持 Monica。假属性是解决排序错误的有趣方法(一旦获取切片,就无法重新排序查询。)
但它也可以固定在一行中
queryset = queryset.order_by(Entry._meta.pk.name)
这种虚假排序需要避免django.form.modelsBaseModelFormSet(BaseFormSet).get_queryset() 中的错误:第 640 行
通过 pk 进行人工排序,但切片后不可能(SQL 中的限制)
更详细的例子
    queryset = Entry.objects.all()
    queryset = queryset.order_by(Entry._meta.pk.name)
    paginator = Paginator(object_list=queryset, per_page=10)
    page_obj = paginator.get_page(request.GET.get('page'))
    EntryFormSet = modelformset_factory(Entry, EntryForm, extra=0)
    entryformset = EntryFormSet(queryset=page_obj.object_list)