ImageField causing error when rendering with "The Image" attribute has no file associated with it.

[mermer]

Since I've upgraded to Django ver 1.00, I'm suddenly getting the
following error with my ImageFields.

The tag is {{ model.image.url}} and it throws an error if the image
field in the database is null (even if it is set to null in the model)

Am I missing something? Here is the error message being generated.


TemplateSyntaxError at /offer_detail_ver2/1/

Caught an exception while rendering: The 'image' attribute has no file
associated with it.

Original Traceback (most recent call last):
File "C:\Python25\Lib\site-packages\django-trunk\django\template
\debug.py", line 71, in render_node
result = node.render(context)
File "C:\Python25\Lib\site-packages\django-trunk\django\template
\debug.py", line 87, in render
output = force_unicode(self.filter_expression.resolve(context))
File "C:\Python25\Lib\site-packages\django-trunk\django\template
\__init__.py", line 535, in resolve
obj = self.var.resolve(context)
File "C:\Python25\Lib\site-packages\django-trunk\django\template
\__init__.py", line 676, in resolve
value = self._resolve_lookup(context)
File "C:\Python25\Lib\site-packages\django-trunk\django\template
\__init__.py", line 705, in _resolve_lookup
current = getattr(current, bit)
File "C:\Python25\Lib\site-packages\django-trunk\django\db\models
\fields\files.py", line 58, in _get_url
self._require_file()
File "C:\Python25\Lib\site-packages\django-trunk\django\db\models
\fields\files.py", line 43, in _require_file
raise ValueError("The '%s' attribute has no file associated with
it." % self.field.name)
ValueError: The 'image' attribute has no file associated with it.

Request Method: GET
Request URL: http://localhost/offer_detail_ver2/1/
Exception Type: TemplateSyntaxError
Exception Value:

Caught an exception while rendering: The 'image' attribute has no file
associated with it.

Original Traceback (most recent call last):
File "C:\Python25\Lib\site-packages\django-trunk\django\template
\debug.py", line 71, in render_node
result = node.render(context)
File "C:\Python25\Lib\site-packages\django-trunk\django\template
\debug.py", line 87, in render
output = force_unicode(self.filter_expression.resolve(context))
File "C:\Python25\Lib\site-packages\django-trunk\django\template
\__init__.py", line 535, in resolve
obj = self.var.resolve(context)
File "C:\Python25\Lib\site-packages\django-trunk\django\template
\__init__.py", line 676, in resolve
value = self._resolve_lookup(context)
File "C:\Python25\Lib\site-packages\django-trunk\django\template
\__init__.py", line 705, in _resolve_lookup
current = getattr(current, bit)
File "C:\Python25\Lib\site-packages\django-trunk\django\db\models
\fields\files.py", line 58, in _get_url
self._require_file()
File "C:\Python25\Lib\site-packages\django-trunk\django\db\models
\fields\files.py", line 43, in _require_file
raise ValueError("The '%s' attribute has no file associated with
it." % self.field.name)
ValueError: The 'image' attribute has no file associated with it.



C:\Python25\Lib\site-packages\django-trunk\django\template\debug.py in
render_node

74. e.source = node.source
75. raise
76. except Exception, e:
77. from sys import exc_info
78. wrapped = TemplateSyntaxError(u'Caught an exception while
rendering: %s' % force_unicode(e, errors='replace'))
79. wrapped.source = node.source
80. wrapped.exc_info = exc_info()

81. raise wrapped # error highlighted on this line

82. return result
83.
84. class DebugVariableNode(VariableNode):
85. def render(self, context):
86. try:
87. output = force_unicode(self.filter_expression.resolve(context))

[mermer]

Anybody with any advice on this. Ever since wev'e upgraded to version
1.00 we are having issues with the ImageField

ValueError: The 'image' attribute has no file associated with it.

[Karen Tracey]

On Thu, Feb 19, 2009 at 7:30 AM, mermer <merm...@googlemail.com> wrote:

Since I've upgraded to Django ver 1.00,  I'm suddenly getting the
following error with my ImageFields.

The tag is {{ model.image.url}} and it throws an error if the image
field in the database is null (even if it is set to null in the model)

Am I missing something?  Here is the error message being generated.


TemplateSyntaxError at /offer_detail_ver2/1/

Caught an exception while rendering: The 'image' attribute has no file
associated with it.

There was some major file storage refactoring done before 1.0, which I'd guess introduced a requirement that attempting to retrieve the url associated with a file-type object requires a file to be associated with that object.  A little experimenting in the shell shows that now where {{ m.file.url }} generates the exception you report in the case where m.file has no file,

{% if m.file %}{{ m.file.url }}{% endif %}

does not.  I didn't work on the file storage refactor so I don't know if this was an intentional difference, and I haven't checked if this was explicitly documented as a backwards-incompatible change, but it seems not-so-surprising that such a method would require a file to be set, and easy enough to adjust to?

Karen