Django内联表单集通过另一个模型在多对多关系中过滤

Posted 2023-02-24

【中文标题】Django内联表单集通过另一个模型在多对多关系中过滤

【英文标题】：Django inline formset filters in manytomany relationship through another model

【发布时间】：2013-04-27 06:36:13

【问题描述】：

我有两个模型 SchoolClass 和 Student，它们通过 Enrollment 模型具有多对多关系。

class Student(models.Model):
    name = models.CharField(max_length=100)
    code = models.CharField(max_length=10)

class SchoolClass(models.Model):
    code = models.CharField(max_length=100)
    cycle = models.ForeignKey(Cycle)
    students = models.ManyToManyField(Student,through='Enrolment')

class Enrolment(models.Model):
    student = models.ForeignKey(Student)
    school_class = models.ForeignKey(SchoolClass)

SchoolClass 模型有一个字段周期（即班级运行的年+学期。当我在管理员中查看学生时，我想查看该学生仅在给定周期内注册的课程（例如当前周期）

我之前在 Enrollment 模型中有循环字段，以下效果很好：

class StudentEnrolmentsInlineFormSet(BaseInlineFormSet):
    def get_queryset(self):
        if not hasattr(self, '_queryset'):
            qs = super(StudentInlineFormSet, self).get_queryset().filter(cycle=Current)
            self._queryset = qs
        return self._queryset

class StudentEnrolmentsInline(admin.TabularInline):
    model = Enrolment
    formset = StudentEnrolmentsInlineFormSet

class StudentAdmin(admin.ModelAdmin):
    form = StudentForm
    inlines = (StudentEnrolmentsInline,)

但是，我已经在 SchoolClass 模型中移动了循环，现在不知道如何将过滤器应用到下一个模型。

【参考方案1】：

除非我忽略了某些内容，否则您可以使用 StudentEnrolmentsInline 上的 queryset 方法来做到这一点：

def queryset(self, request):
    current = Cycle.objects.latest() # or whatever to get the current cycle
    qs = super(StudentEnrolmentsInline, self).queryset(request)
    return qs.filter(school_class__cycle=current)