validate() decorator cannot work with sqlite.plugin

[andycjw]

the @Validate decorator will not work if used together with sqlite plugin since it requires the use of non-keyword argument
using the web todo list tutorial from official website as example

...
@route('/edit/:no', method='GET', apply=sqlite.Plugin(dbfile='todo.db'))
@Validate(no=int)
def edit_item(db, no):
...

calling the url @ /edit/2 will return http error 500
TypeError('edit_item() takes exactly 2 non-keyword arguments (0 given)',)

[iurisilvio]

Add validate decorator to apply parameter.

...
@route('/edit/:no', method='GET', apply=[validate(no=int), sqlite.Plugin(dbfile='todo.db')])
def edit_item(db, no):
    ...

[andycjw]

this works, but can anyone explain why this works while the decorator style doesn't?

[iurisilvio]

The decorator style wraps the callback with another function with different arguments.

The apply parameter in @route decorator use functools.update_wrapper to apply these decorators, so it maintains the callback signature.

http://docs.python.org/library/functools.html#functools.update_wrapper

[andycjw]

is it possible to add @wraps decorator inside the validate decorator in bottle.py to fix it?
this way the validate decorator will works without breaking anything, please correct me if i'm wrong

[iurisilvio]

I never did it, but it is what bottle do. Probably it works.

[defnull]

Should work now.