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TypeError: 'RelatedManager' object is not iterable

Posted by: admin December 2, 2017 Leave a comment

Questions:

Django

I have next 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

say, block b1 has g1 group. By it’s name I want to get all blocks from group g1. I wrote next 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 me RelatedManager object, which is not iterable.

What to do? What’s wrong?

Answers:

Try this:

block in group.block_set.all()

Questions:
Answers:

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

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