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一家公司每月被分配许多任务。每个任务可以有三个选项待定、进行中和已完成。例如：根据我对 01/2021 期间的查询，我得到了正确的结果，但是我无法在每个公司应该连续出现一次的模板上正确列出它们以及每个选项的计数。

模型.py

class Company(models.Model):
    company = models.CharField(max_length=40)

class Period(models.Model):
    period = models.CharField(max_length=7)

class Status(models.Model):
    option = models.CharField(max_length=40)

class Task(models.Model):
    company = models.ForeignKey(Company, on_delete=models.CASCADE, default=None, blank=True, null=True)
    period = models.ForeignKey(Period, on_delete=models.CASCADE, default=None, blank=True, null=True)
    status = models.ForeignKey(Status, on_delete=models.CASCADE, default=1)

视图.py

if request.method == 'POST':
            if form.is_valid():
                periods = Period.objects.get(period=form.cleaned_data['period'])
                status = Task.objects.filter(period=periods).values('period', 'company__compnay', 'status__option', 'status').annotate(count_pending=Count('status', filter=Q(status=1))).annotate(count_inprogress=Count('status', filter=Q(status=2))).annotate(count_completed=Count('status', filter=Q(status=3))))
            args = {'form': form, 'periods': periods, 'status': status}

模板

{% if status %}
            <table class="table table-striped">
                <thead>
                    <tr>
                        <th scope="col">Company</th>
                        <th scope="col">Tasks Pending</th>
                        <th scope="col">Tasks In Progress</th>
                        <th scope="col">Tasks Completed</th>
                    </tr>
                </thead>
                <tbody>
                    {% for stat in status %}
                        <tr>
                            <td>{{stat.company__company}}</td>
                            <td>{{stat.count_pending}}</td>
                            <td>{{stat.count_inprogress}}</td>
                            <td>{{stat.count_completed}}</td>
                        </tr>
                    {% endfor %}
                </tbody>
            </table>
        {% endif %}

结果

Company       Tasks Pending         Tasks In Progress       Completed
Apple         0                     0                       1
Apple         0                     1                       0
Apple         2                     0                       0
Microsoft     0                     0                       2
Microsoft     0                     5                       0
Microsoft     5                     0                       2

预期结果

Company     Pending Tasks   In Progress Tasks   Completed Tasks
Apple       2               1                   1
Microsoft   5               5                   2
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1 回答 1

1

这一定是你想要的：

from django.db.models import Count, Case, When

Task.objects.filter(period=periods).values(
    "company__company").annotate(
        total_tasks=Count("company"),
        count_pending=Count(Case(When(status=1, then=1))),
        count_inprogress=Count(Case(When(status=2, then=1))),
        count_completed=Count(Case(When(status=3, then=1))),
    ).order_by("company")
于 2021-01-21T08:52:04.523 回答