Django TypeError: 'RelatedManager' object 不可迭代

Question

I have these Django models:

class Group(models.Model):
    name = models.CharField(max_length=100)
    parent_group = models.ManyToManyField("self", blank=True)
    
    def __unicode__(self):
        return self.name


class Block(models.Model):
    
    name = models.CharField(max_length=100)
    app = models.CharField(max_length=100)
    group = models.ForeignKey(Group)

    def __unicode__(self):
        return self.name

Lets say that block b1 has the g1 group. By it's name I want to get all blocks from group g1 . I wrote this recursive function:

def get_blocks(group):
    
    def get_needed_blocks(group):
        for block in group.block_set:
            blocks.append(block)

        if group.parent_group is not None:
            get_needed_blocks(group.parent_group)

    blocks = []
    get_needed_blocks(group)
    return blocks
    

But b1.group.block_set returns a RelatedManager object, which is not iterable.

What am I doing wrong and how can I fix it?

Answer 1

Try this:

block in group.block_set.all()

Answer 2

Use it like a Manager . If you want all the objects then call the all() method.

Answer 3

you have to use.all() with related name or childModel_set model name.

in views.py use:

for item in object.relatedname.all():
    do something ......

in html templates use:

 {% for item in object.relatedname.all %}
   do something ......
 {% endfor %}