cigar_example documentation - RuntimeError: Unable to use callback invalid closure/function specified. about django-rest-swagger HOT 17 CLOSED

The problem is that func_code and func_closure were renamed code and closure in Python 3. Below is a patch that allows the introspection to work with both Python 2.x and 3.x.

--- old/introspectors.py
+++ new/introspectors.py
@@ -287,14 +287,20 @@
             yield ViewSetMethodIntrospector(self, methods[method], method)

     def _resolve_methods(self):
-        if not hasattr(self.pattern.callback, 'func_code') or \
-                not hasattr(self.pattern.callback, 'func_closure') or \
-                not hasattr(self.pattern.callback.func_code, 'co_freevars') or \
-                'actions' not in self.pattern.callback.func_code.co_freevars:
+        callback = self.pattern.callback
+        try:
+            try:
+                closure = callback.func_closure
+            except AttributeError:
+                closure = callback.__closure__
+            try:
+                code = callback.func_code
+            except AttributeError:
+                code = callback.__code__
+            freevars = code.co_freevars
+        except AttributeError:
             raise RuntimeError('Unable to use callback invalid closure/function specified.')
-
-        idx = self.pattern.callback.func_code.co_freevars.index('actions')
-        return self.pattern.callback.func_closure[idx].cell_contents
+        return closure[freevars.index('actions')].cell_contents


 class ViewSetMethodIntrospector(BaseMethodIntrospector):

The 2to3 tool automatically handles renaming the attributes, rendering the inner try-except blocks unnecessary. The code could become:

    def _resolve_methods(self):
        callback = self.pattern.callback
        try:
            closure = callback.func_closure
            freevars = callback.func_code.co_freevars
        except AttributeError:
            raise RuntimeError('Unable to use callback invalid closure/function specified.')
        return closure[freevars.index('actions')].cell_contents

from django-rest-swagger.

+1

from django-rest-swagger.

I've updated the _resolve_methods method in my introspectors.py to look like this:

def _resolve_methods(self):
    callback = self.pattern.callback
    try:
        closure = callback.func_closure
        freevars = callback.func_code.co_freevars
    except AttributeError:
        raise RuntimeError('Unable to use callback invalid closure/function specified.')
    return closure[freevars.index('actions')].cell_contents
    idx = self.pattern.callback.__code__.co_freevars.index('actions')
    return self.pattern.callback.__closure__[idx].cell_contents

However, I'm still getting a 'Unable to use callback invalid closure/function specified.' error. I'm running Python 3.4.1. Any thoughts?

from django-rest-swagger.

Did github mangle your code somehow? The snippet doesn't make very much sense to me.

I'm using (with Python 3.4):

    def _resolve_methods(self):
        callback = self.pattern.callback
        try:
            try:
                closure = callback.func_closure
            except AttributeError:
                closure = callback.__closure__
            try:
                code = callback.func_code
            except AttributeError:
                code = callback.__code__
            freevars = code.co_freevars
        except AttributeError:
            raise RuntimeError('Unable to use callback invalid closure/function specified.')

        return closure[freevars.index('actions')].cell_contents

from django-rest-swagger.

Yeah, not sure what happened there. Here's what I've got:

def _resolve_methods(self):
    callback = self.pattern.callback
    try:
        closure = callback.func_closure
        freevars = callback.func_code.co_freevars
    except AttributeError:
        raise RuntimeError('Unable to use callback invalid closure/function specified.')
    return closure[freevars.index('actions')].cell_contents

Still getting same error message.

from django-rest-swagger.

As far as I know that is supposed to work but I don't trust the 2to3 black magic. Try the long winded explicit version I posted above.

from django-rest-swagger.

Works! Thanks!

from django-rest-swagger.

Thanks for the snippet too. I am wondering if this will be patched into the code someday?

from django-rest-swagger.

Hey, this worked to let the error message go away, but instead I now get a Value error:
tuple.index(x): x not in tuple
from this line
return closure[freevars.index('actions')].cell_contents
freevars only contains: ('view_func',)
I used the code from @jason-kane .
Did anyone else experience this problem?

from django-rest-swagger.

Haven't seen that; it looks like there must be something missing in the function it is trying to introspect. 'actions' looks like it comes from DRF itself not the swagger addition. Does the DRF browser work?

from django-rest-swagger.

I am using Django 1.7 and DRF 2.4.3. The DRF browser works fine.

from django-rest-swagger.

looks like #123 is biting you. Symptoms are identical to #129

from django-rest-swagger.

you are right. Did not see them. Thank you. Too bad this repository is not maintained.

from django-rest-swagger.

I added what looks like a suitable fix to pull request #85 ; I haven't actually tried it against DRF 2.4.3 yet.

from django-rest-swagger.

sorry but still having the issue from installing by pip. Is it merged and updated to pypi ?

from django-rest-swagger.

Same here. Doesn't work with Django REST Framework 2.4.3 and Django 1.7.

from django-rest-swagger.

fixed in develop.

from django-rest-swagger.