I had a close look at the source code and found the line #from allModels import *
It had a comment hash (#) in front. This code wasn't updated for weeks. And probably had run correctly since because the homepage request handler also does the import. And usually the page with the error is reached from the homepage. These type of import errors could be detected during development if the dev-server can be configured, with a parameter, to remove all loaded modules at the start or at the end of a request. This way all requests are tested as if they had to run on a cold instance. 2010/8/13 Tim Hoffman <[email protected]>: > Hi > > You will possibly find that you have exercised some code that tries to > fetch and entity with a reference, but the reference target entities > class > has not been imported first. > > You must import classes prior to trying to fetch them. > > Now use MyModelX.all().get() implies that you have imported MyModelX. > > You have if you have MyModelY and it has a reference to a MyModelX and > you have not explicity imported it first > then MyModelY.all().get() would give a simliar error. > > Rgds > > T > > On Aug 13, 4:01 pm, djidjadji <[email protected]> wrote: >> I just got this error while processing a request >> >> KindError: No implementation for kind 'MyModelX' >> >> I returned to the home page and requested the same page again a few >> seconds later and the error was gone. >> Now it can find the implementation. >> >> I use the Python API, and the error was raised during fetching a >> ReferenceProperty object. >> >> It was not a datastore timeout because the CPU usage was >> >> ms=79 cpu_ms=100 api_cpu_ms=42 >> >> What can be the cause of this failure to find an implementation for a kind? >> >> ------------------ >> File >> "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init_ >> _.py", >> line 3206, in __get__ >> instance = get(reference_id) >> File >> "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init_ >> _.py", >> line 1314, in get >> cls1 = class_for_kind(entity.kind()) >> File >> "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init_ >> _.py", >> line 267, in class_for_kind >> raise KindError('No implementation for kind \'%s\'' % kind) >> KindError: No implementation for kind 'MyModelX' > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
