Is django's mtpp break manytomany filter?

Question

I have models like below:

class Topic(MPTTModel):
    parent = TreeForeignKey('self', null=True, blank=True, related_name='children', db_index=True)  
    name = models.CharField(max_length=200, blank=False)
    tasks = models.ManyToManyField("Task", through="TopicTask")

class Task(models.Model):
    name = models.CharField(max_length=200, blank=False)
    madocs = models.ManyToManyField("Madoc", through="TaskMadoc")   

class TopicTask(models.Model):
    topic = models.ForeignKey("Topic")
    task = models.ForeignKey("Task")


class TaskMadoc(models.Model):
    task = models.ForeignKey("Task")
    madoc = models.ForeignKey("Madoc")

I tried

Task.objects.filter(madocs__id=1)

works well!

but when I tried

Topic.objects.filter(tasks__id=1)

the error is:

FieldError: Cannot resolve keyword 'tasks' into field. Choices are: children, created, id, level, lft, name, order, parent, parent_id, rght, studyplan, topictask, tree_id

So, choices don't have tasks!

Why? is mptt mess it?

score 1 · Answer 1 · answered Nov 12 '15 at 10:40

1

Try

Topic.objects.filter(topictask__task__id=1)

answered Nov 12 '15 at 10:40

madzohan

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that's my fault,i have "def tasks" in Topic model – lsaturn Nov 12 '15 at 15:18

Is django's mtpp break manytomany filter?

1 Answers1