Django maximum recursion depth exceeded

Question

I'm building a small web project using Django that has one model (Image) that contains an ImageField. When I try to upload an image using the admin interface I am presented with this problem (personally identifying information removed):

RuntimeError at /admin/main/image/add/

maximum recursion depth exceeded

Request Method:     POST
Request URL:    http://x.x.x.x:8080/blog/admin/main/image/add/
Django Version:     1.2.1
Exception Type:     RuntimeError
Exception Value:    

maximum recursion depth exceeded

Exception Location:     /extra/django/blog/main/models.py in __unicode__, line 26
Python Executable:  /usr/bin/python
Python Version:     2.4.3
Python Path:    ['/extra/django', '/usr/lib/python2.4/site-packages/setuptools-0.6c11-py2.4.egg', '/usr/lib/python2.4/site-packages/MySQL_python-1.2.3-py2.4-linux-i686.egg', '/usr/lib/python24.zip', '/usr/lib/python2.4', '/usr/lib/python2.4/plat-linux2', '/usr/lib/python2.4/lib-tk', '/usr/lib/python2.4/lib-dynload', '/usr/lib/python2.4/site-packages', '/usr/lib/python2.4/site-packages/Numeric', '/usr/lib/python2.4/site-packages/PIL', '/usr/lib/python2.4/site-packages/gtk-2.0']
Server time:    Tue, 17 Aug 2010 13:30:20 -0400

And this is a portion of my models.py:

class Image(models.Model):
image = models.ImageField(upload_to='uploads/blog_images')
caption = models.CharField(max_length=300)
post = models.ForeignKey('Post')
thumbWidth = models.IntegerField(blank=True,null=True)
thumbHeight = models.IntegerField(blank=True,null=True)
def printTag(self, newClass=''):
    str = '<img '
    if newClass is not '':
        str = str + 'class="%s" ' %newClass
    if self.thumbWidth is not None and self.thumbHeight is not None:
        str += 'width="%i" height="%i" ' %(self.thumbWidth,self.thumbHeight)
    str = str + 'src="%s" ' %self.image
    str = str + '>%s</img>' %self.caption
    return str
def __unicode__(self):
    return self.printTag(self)

Line 26 is the only line inside unicode. I have the extra function (printTag) so I can choose whether or not to print the HTML tag with a "class" attribute with the default being without the attribute. Why is it recursing when I upload an image?

Answer 1

You need return self.printTag() not return self.printTag(self)