django.core.exceptions.FieldError: Unknown field(s) (y, b, d, o)

Question

I have a model where I have the following architecture

There is Post model
And there is an answer model for the given post (just like in stack overflow)

Since there are some fields which I do not want the user to populate, I have made a custom form for both of the models. The custom form class is working absolute for the first model i.e. Post Model, but I am getting this strange for the PostAns model. If I remove the class PostAnsForm then it works fine.

class PostAns(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    creator = models.ForeignKey(User, blank=True, null=True)
    post = models.ForeignKey(Post)
    body = models.TextField()
    like_count = models.IntegerField(default=0,blank=True,null=True)
    # If we use markdown can remove this if not
    body_html = models.TextField(blank=True)

class PostAnsForm(ModelForm):

    class Meta:
        model = PostAns
        fields = ('body')

I haven't found a similar error on the net.

Possible duplicate of [Django: Field Error Unknown fields](https://stackoverflow.com/questions/6768194/django-field-error-unknown-fields) — Dan, Jun 16 '17 at 13:45

score 11 · Accepted Answer · answered Nov 12 '11 at 19:40

the fields attribute is expecting a list or tuple. it finds a string, which is also iterable, but iterating through a string yields each character.

try

fields = ('body', )

this is a fairly common case, and the exact error depends on your string, so is hard to google. the hint is the list of fields (did you possibly change the order of the characters?)

Unknown fields b, o, d, y

notice how they are all one character, and spell out what looks like a string value from your code

Thanks alot I would have never figured out this error on my own. — Sachin, Nov 12 '11 at 20:34

django.core.exceptions.FieldError: Unknown field(s) (y, b, d, o)

1 Answers1