Django models Django Models-FK默认为上次输入的记录（由登录用户输入）

我有两个模型在讨论中。JobRecord有许多活动，当然，fk放在活动模型中

为了帮助数据输入，我想将新活动中的fk To JobRecord默认为“登录用户上次输入的活动的JobRecord fk（加分！）”

模型如下：

class Activity(models.Model):
    """
    Record multiple activities against a JobRecord
    """

    start               = models.TimeField(blank=True, null=True)
    end                 = models.TimeField(blank=True, null=True)
    job_record          = models.ForeignKey(JobRecord) # editable=False)
    task                = models.ForeignKey(Task, blank=True, null=True) # show only tasks found in project
    flora               = models.ManyToManyField(Species, blank=True, null=True, help_text='Optional subject flora.')

    memo                = models.TextField(blank=True, null=True)

    all_operators       = models.BooleanField(help_text="Check to include all operators from the parent job record")
    operators           = models.ManyToManyField(User, null=True, blank=True)

    duration            = models.DecimalField(blank=True, null=True, max_digits=7, decimal_places=2)

    class Meta:
        #order_with_respect_to = 'job_record' # not working?
        ordering = ['-job_record__date', 'job_record', 'start']

form = ActivityForm(job_record=last_activity_data.job_record)

---

谢谢

作为第一步，您应该将每个用户的最后一个活动存储在某个模型中

class ActivityLog(models.Model)
    user = models.ForeignKey(User)
    job_record = models.ForeignKey(JobRecord)

然后在视图中，您可以通过一些简单的查询来检索活动：

last_activity_data = ActivityLog.objects.filter(user=request.user)

并在初始化模型的表单时使用它：

class Activity(models.Model):
    """
    Record multiple activities against a JobRecord
    """

    start               = models.TimeField(blank=True, null=True)
    end                 = models.TimeField(blank=True, null=True)
    job_record          = models.ForeignKey(JobRecord) # editable=False)
    task                = models.ForeignKey(Task, blank=True, null=True) # show only tasks found in project
    flora               = models.ManyToManyField(Species, blank=True, null=True, help_text='Optional subject flora.')

    memo                = models.TextField(blank=True, null=True)

    all_operators       = models.BooleanField(help_text="Check to include all operators from the parent job record")
    operators           = models.ManyToManyField(User, null=True, blank=True)

    duration            = models.DecimalField(blank=True, null=True, max_digits=7, decimal_places=2)

    class Meta:
        #order_with_respect_to = 'job_record' # not working?
        ordering = ['-job_record__date', 'job_record', 'start']

form = ActivityForm(job_record=last_activity_data.job_record)

最后，记住在保存活动时更新日志

注意：我省略了所有的错误检查；例如，您应该注意没有

最后一个作业记录的情况，但它应该非常简单

最后，您还可以使用ManyToManyField来创建活动，然后使用Django的API；它将是完全等效的（例如，它将在幕后创建一个非常类似于此的表），但我认为语义会略有不同，因此我更喜欢显式解决方案