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  • KindError: Property r must be an instance of SecondModel, why ?

    - by zjm1126
    class FirstModel(db.Model): p = db.StringProperty() r=db.ReferenceProperty(SecondModel) class SecondModel(db.Model): r = db.ReferenceProperty(FirstModel) class sss(webapp.RequestHandler): def get(self): a=FirstModel() a.p='sss' a.put() b=SecondModel() b.r=a b.put() a.r=b a.put() self.response.out.write(str(b.r.p)) the error is : Traceback (most recent call last): File "D:\Program Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py", line 511, in __call__ handler.get(*groups) File "D:\zjm_code\helloworld\a.py", line 158, in get a.r=b File "D:\Program Files\Google\google_appengine\google\appengine\ext\db\__init__.py", line 3009, in __set__ value = self.validate(value) File "D:\Program Files\Google\google_appengine\google\appengine\ext\db\__init__.py", line 3048, in validate (self.name, self.reference_class.kind())) KindError: Property r must be an instance of SecondModel thanks

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  • Searching subversion history (full text)

    - by rjmunro
    Is there a way to perform a full text search of a subversion repository, including all the history? For example, I've written a feature that I used somewhere, but then it wasn't needed, so I svn rm'd the files, but now I need to find it again to use it for something else. The svn log probably says something like "removed unused stuff", and there's loads of checkins like that.

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  • What is the best way to create a running integer id on the AppEngine data storage?

    - by Freed
    For various reasons, I need a unique running integer id for my entities stored on the Google AppEngine. The automatically generated key sort of has this behaviour, but it doesn't start from 1 (or 0) and doesn't guarantee that the generated integer part will come from a continuous sequence. What would be the best way to efficiently implement this on AppEngine? Is there any support from the storage system? To add to the complexity, I might need to do this over entities from different entity groups, meaning I can't just get the highest id right now and save an entity with the next id in a transaction. Might memcache be the way to go..? Edit: I havn't yet implemented this, but to clarify on the memcache idea. I know memcache is unreliable, but in practice it probably won't lose data "too often" to hurt performance. Basically, I would have a memcache entry for the last used id, update it (somehow atomically) whenever I create a new entity and use that id. In the case of memcache not having a value for this entry, I'd get the highest id so far by doing a query on my entities sorted by the id and update memcache (unless someone else had already done so). The only problem I can see with this right now would be atomicity of the operation as a whole if the save of my new entity was also part of a transaction. Thoughts..?

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  • Is it possible to have a composite index with a list property and a sort order?

    - by npdoty
    And if not, why not? The following index always fails for me, even though I had thought I could have a sort order with a list property as long as the index didn't sort or match against any other properties. - kind: Foo properties: - name: location_geocells - name: time direction: desc If such a composite index is allowed, are there any reasons that this might be failing for me? Do the existence of other indices on the same model increase the likelihood of this failure? Does the combination of a sort order with a list property require more than N entries, where N is the number of values in the list property? (If so, how many does it require?)

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  • Getting MATLAB variable (string) from C

    - by Hamming
    Hi! I'm writing a small C application that launchs a Matlab script (.m file). I need to exchange some variables and I don't know how to get an array of chars that exists in Matlab. I'm doing something like this: enter code here result = engGetVariable(ep,"X"); if (!result) { printf ("Error..."); exit -1; } int n = mxGetN(result); char *varx = NULL; memcpy(varx, mxGetData(result),n*sizeof(char)); It doesn't work. Does someone know how to get a Matlab string in C? I've read Matlab documentation about engGetVariable() and the provided example but any of this things clarify me.

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  • Timeout loading application on GAE using web2py

    - by Charles P.
    I am uploading an app to GAE. Through some experimentation I've found that if I don't include wsgihandler.py, the app loads very slowly. It feels like it's looking for this file and them timing out. Besides the slow loading, everything works perfectly without wsgihandler.py, so I want to know if there is a simple way to remove the references to the file. I tried poking around the files, but it doesn't look like there are direct references. Also, I asked before what I need at a minimum to get an application to work, and I found that I need: web2py/app.yaml web2py/gaehandler.py web2py/VERSION web2py/gluon/* (and subfolders, this is web2py) web2py/applications/theoneappyouwanttodeploy/* (and subfolders)

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  • How do I get the application title of a Google AppEngine app from within that app

    - by Noah McIlraith
    Under the application settings page in the Administration console, it is possible to specify a name for the application, AFAIK this is used in the login page when using the users API to login. I would like to be able to use this information within an application, currently, the title is also specified in a separate configuration file, but configuration repetition is something I would like to avoid if at all possible. Is there some way for a GAE application to determine the "Application Title"? Oh, also, I am using python.

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  • Java ORM related question - SQL Vs Google DB (Big Table?) GAE

    - by StackerFlow
    I was wondering about the following two options when one is not using SQL tables but ORM based DBs (Example - when you are using GAE) Would the second option be less efficient? Requirement: There is an object. The object has a collection of similar items. I need to store this object. Example, say the object is a tree and it has a collection of leaves. Option 1: Traditional SQL type structure: Table for the Tree (with TreeId as the identifier for a row in the Table.) Table for the Leaves (where each leaf has a TreeId and to show the leaves of a tree, I query all leaves where the TreeId is the Id of the tree.) Here, the Tree structure DOES NOT have a field with leaves. Option 2: ORM / GAE Tables: Using the same example above, I have an object for Tree where the object has a collection (Set/List in Java/C++) of leaves. I store and retrieve the Tree together with the leaves (as the leaves are implemented as a Set in the Tree object) My question is, will the second one be less efficient that the first option? If so, why? Are there other alternatives? Thank you!

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  • How often does memcache on Google AppEngine lose data?

    - by Freed
    Memcache in general and on AppEngine in specific is unreliable in the sense that my data may be deleted from the cache for whatever reason at any point in time. However, in some cases there might be cases where a small risk may be worth the added performance using memcache could give, such as updating some data in memcache that gets saved periodically to some other, more reliable storage. Are there any numbers from Google that could give me an indication of the actual probability that a memcache entry would be lost from the cache before its expiration time, given that I keep within my quotas? Are there any reasons other than hardware failure and administrative operations such as machines at the data centers being upgraded/moved/replaced that would cause entries to be removed from memcache prematurely?

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  • how do you set a handler for appengine_rpc?

    - by python for ever
    i followed what is said in the article. but still i get these errors: first this warning : No handlers could be found for logger "google.appengine.tools.appengine_rpc" then this error: HTTPError: HTTP Error 500: Internal Server Error anyone has an idea about what i am doing wrong? thanks.

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  • how do I instrospect appengine's datastore models?

    - by python for ever
    in order to dynamically create a form, i have to find the property types of a model's properties at runtime. appengine docs says that Model.properties() will return a dictionary of properties name and their class type. when i use this method in my code, only the name is returned and the classtype value is always empty.

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  • Can prefixing a dash reduce the search engine rating?

    - by LeoMaheo
    Hi anyone! If I prefix a dash to GUIDs in my URLs on my Web site, in this manner: example.com/some/folders/-35x2ne5r579n32/page-name Will my SEO rating be affected? Background: On my site, people can look up pages by GUID, and by path. For example, both example.com/forum/-3v32nirn32/eat-animals-without-friends and example.com/forum/eat-animals-without-friends could map to the same page. To indicate that 3v32nirn32 is a GUID and not a page name, I thought I could prefix a - and then my webapp would understand. But I wouldn't want my search engine rating to drop. And prefixing a dash in this manner seems weird, so perhaps Googlebot lowers my rating. Hence my question: Do you know if my search engine rating might drop? (Today or in the future?) (I could also e.g. prefix id-, so the URL becomes example.com/forum/id-3v32nirn32, but then people cannot create pages that start with the word "id".) (I think I don't want URLs like this one: example.com/id/some-guid.) Kind regards, Magnus

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  • How to do Cross Platform in own Engine? [on hold]

    - by Mineorbit
    At the Moment I finished the first game with my game engine(if I wanna call it like that) which is based in LWJGL. Now i'm worring if I could do crossplattforming in my engine. I build me a tool tool with a batch file to compile my project dir into an .exe . At first i'm looking to do it on Android with an comparable batch file. An link for an tutorial would be awesome! At next place there would be an renderer and audiosystem. If read that theres an OpenGL ES renderer, and I allready played a bit around with the Android SDK. But I use the Texture and Audio class in slick-util. So I thought about creating OOP classes that carry around the data and load it in an platform specific Buffer. A Link for an equaly easy-to-use Texture or Audio class would be awesome! Thats all for now! Answers would be awesome! Thanks, Mineorbit!

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