过滤并计入for循环

Question

在Django（2.0）中，我正在遍历记录以在表中显示它们，我希望在每条记录的末尾显示一个汇总计数，我使用count = Fraction.objects.all().filter(botany_id=13).count()进行了此工作，而显示{ {1}}但这是为记录13设置的，该行的下一个记录具有植物学ID = 14，所以我该如何动态地执行此操作，本质上是植物学ID = botany_id

{{ count }}

@@@@@@编辑

#views.py
def allflotation(request):
    botany = Botany.objects.all()
    fraction = Fraction.objects.all()
    count = Fraction.objects.all().filter(botany_id=13).count()
    fractioncomposition = FractionComposition.objects.all()
    # fractionmaterialspresent = FractionMaterialsPresent.objects.all()
    return render(request, 'flotation/allflotation.html',
    {
    'botany':botany,
    'fraction':fraction,
    'count':count,
    'fractioncomposition':fractioncomposition,
    # 'fractionmaterialspresent':fractionmaterialspresent
    })

将#html ... <tbody> {% for botany in botany.all %} <tr> <td>{{ botany.sample_id }}</td> <td>{{ botany.area_easting }}.{{ botany.area_northing }}.{{ botany.context_number }}</td> <td>{{ botany.botany_id }}</td> <td>{{ botany.sample_number }}</td> <td>{{ botany.entry_date }}</td> <td>{{ botany.flotation_date }}</td> <td>{{ botany.analyst }}</td> <td>{{ botany.notes }}</td> <td> <div class="btn-group" role="group" aria-label="Basic example"> <a href="{% url 'addfraction' pk=botany.botany_id %}"> <span class="badge badge-primary"> Add Fraction <br /> <span class="badge badge-light"> {{ count }} </span> </span> </a> ... 更改为{{ count }}给我的植物学编号

Answer 1

使用related manager。

views.py

botanies = Botany.objects.all()

template.html

{% for botany in botanies %}
    {{botany.fraction_set.count}}
{% endfor %}

您稍后需要优化查询数量。