still getting 404 error while a url is defined in the application mapping

[Dolf Andringa]

Hi all,

I am using web.py to dynamically generate basic CRUD operations on objects defined in my SQLAlchemy model on startup of the application. This was working fine up to now. Now I added an extra SQLAlchemy object and somehow I get a 404 error when calling a url for it that is defined in the application mapping and does work for the other SQLAlchemy objects.

I did a debug session, showing the mapping of my application. You can see that /rvc_species/sample/ and /rvc_species/speciesgroup/ are both present in the mapping and point to a  web.appliation.application instance and both have exactly the same urls defined for them, using the same classes for each url. 

#Issue the requests

>>> app.request('/rvc_species/sample/').status
'200 OK'
>>> app.request('/rvc_species/speciesgroup/').status
'404 Not Found'

#Check the applications in /rvc_species
>>> dict(dict(app.mapping)['/rvc_species'].mapping).keys()
['/sample', '/speciesgroup', '/site', '/observation', '/species', '/new', '/observer']

>>> dict(dict(app.mapping)['/rvc_species'].mapping)['/sample']
<web.application.application instance at 0x7feed45f3a70>
>>> dict(dict(app.mapping)['/rvc_species'].mapping)['/speciesgroup']
<web.application.application instance at 0x7feed45f5fc8>

#check the urls/controllers defined for both /rvc_species/sample and /rvc_species/speciesgroup
>>> dict(dict(app.mapping)['/rvc_species'].mapping)['/sample'].mapping
[['/', <class controllers.dynamic_controller.lst at 0x7feed411f390>], ['/new', <class controllers.dynamic_controller.new at 0x7feed411f4c8>], ['/([0-9]+)', <class controllers.dynamic_controller.show at 0x7feed411f3f8>], ['/delete', <class controllers.dynamic_controller.deletectl at 0x7feed411f460>]]

>>> dict(dict(app.mapping)['/rvc_species'].mapping)['/speciesgroup'].mapping
[['/', <class controllers.dynamic_controller.lst at 0x7feed411fbb0>], ['/new', <class controllers.dynamic_controller.new at 0x7feed411fce8>], ['/([0-9]+)', <class controllers.dynamic_controller.show at 0x7feed411fc18>], ['/delete', <class controllers.dynamic_controller.deletectl at 0x7feed411fc80>]]

This is my basic web.py application script. I left out some extra stuff but what is there is unaltered.

render = web.template.render('templates/')


class new:
    def GET(self):
        return render.new()


class index:
    def GET(self):
        datasets = [d.__name__.split('.')[-1] for d in model.datasets]
        return render.index(datasets)


urls = [
    "/", index
]


for dataset in [d.__name__.split('.')[-1] for d in model.datasets]:
    #loop over the different 'datasets' in the SQLAlchemy model
    ds_urls = ["/new",new] #create a "new" controller with a standard form for each dataset
    for obj in getattr(model,dataset).tables:
        #for each 'table' in the SQLAlchemy model, create a subapplication defining basic CRUD operations
        application = getApplication(obj)
        name = obj.__name__.lower()
        ds_urls += ["/%s"%name,application]
    ds_app = web.application(tuple(ds_urls), locals(), autoreload=False)
    urls.append("/%s"%dataset)
    urls.append(ds_app)


app = web.application(tuple(urls), globals(),autoreload=False)

This code calls getApplication which is pretty simple and looks like the following:

def getApplication(orm_cls):

    class lst(BaseListController):
        ORM_CLS = orm_cls


    class show(BaseShowController):
        ORM_CLS = orm_cls


    class deletectl(BaseDeleteController):
        ORM_CLS = orm_cls


    class new(BaseController):
        ID = orm_cls.__name__.lower()
        TITLE = 'New %s'%orm_cls.__name__
        ORM_CLS = orm_cls

    urls = (
        "/", lst,
        "/new", new,
        "/([0-9]+)", show,
        "/delete", deletectl
    )

    return web.application(urls, locals())

The BaseListController, BaseDeleteController, BaseController and BaseShowController just define GET and sometimes POST methods that provide basic CRUD operations on the object defined in it's ORM_CLS.

I have no clue why I get 404 errors for /rvc_species/speciesgroup/ but not for /rvc_species/sample/.

Does anyone have any idea how I can debug this further?

Cheers,

Dolf.