Question

尝试在管理页面中以逗号分隔的列表函数返回manytomanyfield的表名。

class Machine(models.Model):
    class Meta:
        verbose_name = 'Machine'
        verbose_name_plural = '02 Machines'
    machine_type_choices = (...)
    valuestream = models.ForeignKey(Valuestream, on_delete=models.CASCADE)
    machine_number = models.CharField(
        max_length=6,
        help_text="Please exclude the 'm' in the machine number",
        unique=True,
        validators=[
        MinLengthValidator(4, message="Machine numbers have to be greater than 3 digits long"),
        ]
    )
    machine_type = models.CharField(max_length=50, choices=machine_type_choices)
    machine_brand = models.CharField(max_length=30, blank=True)
    pub_date = models.DateTimeField(auto_now=True)
    pass

    def __str__(self):
    return str(self.machine_number)




class SWS_Document(models.Model):
    class Meta:
        verbose_name = 'SWS Document'
        verbose_name_plural = '03 SWS Documents'

    machines = models.ManyToManyField(Machine, related_name='SWS_documents')
    document_description = models.CharField(max_length=150, default="")
    pub_date = models.DateTimeField(auto_now=True)

    def __str__(self):
        return str(self.machines.machine)

我无法弄清代码的最后一点。我试图返回与SWS_Document关联的列表中的所有相关机器。

Answer 1

您不应该在模型str方法中真正执行此操作，因为当您想要模型的字符串表示形式时，该方法将覆盖所有时间。在管理方法中执行此操作，然后将该方法的名称添加到list_display属性中。

class SWSDocumentAdmin(admin.ModelAdmin):
    model = SWS_Document
    list_display = ('machine_list',)

    def machine_list(self, obj):
        return ', '.join(obj.machines.values_list('machine_number', flat=True))

Django在相关的多对多字段中查询和列出所有对象

1 个答案: