Python Django如何在过滤后注释多个模型上的关键字实例总数？

好的，我有一个“关键字”模型，它为其他4个模型存储我的关键字，每个模型都有一个“关键字列表”字段，它是一个

ManyToManyField

指向我的“关键字”模型。我的每个模型都有多个关键字，我正在搜索它们并成功地找到它们，如下所示：

keys_selected='term1$term2$term3$'
keys_selected = keys_selected.rstrip('$')
keys_selected = keys_selected.split('$')
goal = len(keys_selected)
remaining = list()
remaining += Keyword.objects.filter(employee__key_list__key__in=keys_selected).annotate(num_keys=Count('key')).filter(num_keys=goal).distinct()
remaining += Keyword.objects.filter(vendor__key_list__key__in=keys_selected).annotate(num_keys=Count('key')).filter(num_keys=goal).distinct()
remaining += Keyword.objects.filter(application__key_list__key__in=keys_selected).annotate(num_keys=Count('key')).filter(num_keys=goal).distinct()
remaining += Keyword.objects.filter(machine__key_list__key__in=keys_selected).annotate(num_keys=Count('key')).filter(num_keys=goal).distinct()
key_list = list()
for x in remaining:
    if x not in key_list:
        key_list.append(x)

这将返回一个包含所有关键字的字典，这些关键字分配给包含我所选术语的4个模型中的所有条目。这里的想法是创建一个过滤器，直观地显示与我的搜索查询匹配的对象的

key\u列表

中所有关键字的词频。我希望它将其附加到输出到上下文的字典中，这样我就可以调用该值并将其用于字体大小，如下所示：

{% for key in key_list %}
<a href="{% url 'keysearch:index' %}?keys_selected={{ key }}${{ keys_selected }}" style="font-size: {{ key.num_keys }}px;">({{ key }})</a>
{% endfor %}

找到了使用groupby有效的答案

我的解决方案（包括他的代码）：

然后在模板中：

{% for key in key_list %}
    <a href="{% url 'keysearch:index' %}?keys_selected={{ key.key }}${{ keys_selected }}" style="font-size: {{ key.count }}px;">({{ key.key }})</a>
{% empty %}
    <div class="w3-card-2 w3-black w3-center w3-rest"><h4>There are no key queries with this combination.</h4></div>
{% endfor %}

{%用于密钥列表中的密钥%}
{%empty%}
没有使用此组合的关键查询。
{%endfor%}

from django.db.models import Count
from keysearch.models import Employee, Vendor, Application, Machine, Keyword
from itertools import groupby


def unique_keys(input):
    output = []
    for x in input:
        if x not in output:
            output.append(x)
    return output


def canonicalize_dict(x):
    return sorted(x.items(), key=lambda x: hash(x[0]))


def unique_and_count(lst):
    grouper = groupby(sorted(map(canonicalize_dict, lst)))
    return [dict(k + [("count", int(len(list(g)) * 2.3 + 16))]) for k, g in grouper]


def keycount(key_list='', keys_selected=''):
    goal = len(keys_selected)
    key_ref = list()
    db_list = [Employee, Vendor, Application, Machine]
    for db in db_list:
        if keys_selected == '':
            source = db.objects.all()
        else:
            source = db.objects.filter(key_list__key__in=keys_selected).annotate(num_keys=Count('key_list')).filter(num_keys=goal).distinct()
        for entry in source:
            key_ref += entry.key_list.values()
    key_list = unique_and_count(key_ref)
    return key_list

@register.inclusion_tag('keysearch/key_cloud.html')
def key_cloud(keys_selected=''):
    if keys_selected == '':
        key_list = Keyword.objects.all()
        key_list = keycount(key_list, keys_selected)
    else:
        keys_selected = keys_selected.rstrip('$')
        keys_selected = keys_selected.split('$')
        keys_selected = unique_keys(keys_selected)
        goal = len(keys_selected)
        remaining = list()
        remaining += Keyword.objects.filter(employee__key_list__key__in=keys_selected).annotate(num_keys=Count('key')).filter(num_keys=goal)
        remaining += Keyword.objects.filter(vendor__key_list__key__in=keys_selected).annotate(num_keys=Count('key')).filter(num_keys=goal)
        remaining += Keyword.objects.filter(application__key_list__key__in=keys_selected).annotate(num_keys=Count('key')).filter(num_keys=goal)
        remaining += Keyword.objects.filter(machine__key_list__key__in=keys_selected).annotate(num_keys=Count('key')).filter(num_keys=goal)
        key_list = unique_keys(remaining)
        key_list = keycount(key_list, keys_selected)
        keys_selected = "$".join(keys_selected)
        keys_selected += '$'
    context = {'key_list': key_list, 'keys_selected': keys_selected}
    return context

{% for key in key_list %}
    <a href="{% url 'keysearch:index' %}?keys_selected={{ key.key }}${{ keys_selected }}" style="font-size: {{ key.count }}px;">({{ key.key }})</a>
{% empty %}
    <div class="w3-card-2 w3-black w3-center w3-rest"><h4>There are no key queries with this combination.</h4></div>
{% endfor %}