Group items tagged

Entity groups are a simple concept. Entities in App Engine have ancestors. For e.g. you could model Books and Authors. Author: name->X, and Author: name->Y are two entities in the Author KIND. Book is another KIND (KIND is just a logical grouping of entities). The relationship between Books and Authors can be modeled as a ancestor-child relationship. E.g. Book: name->B1, B2 could have been written by Author: name->X. So you modeled them as: Author: name->X is a parent of both Book: name->B1, B2. Similarly, Book: name->B3 is written by Author: name->Y and so could model that relationship as Author:name->Y is a parent of Book:name->B3. When you try to transact on Books kind, you cannot transact on B1,B3 and B3 together. As they participate in different ancestor-child relationships. Every ancestor child relationship is an Entity group. You can only "lock" on one entity group at a time. Hope this makes things a little clear.

Google app engine uses the concept of static files. This is a performance optimization. Using the file appengine-web.xml you can configure the way google handles static files. You can include and exclude certain files using their extension or name. More information can be found here at google. This all works nice in the online version, however there seems to be a problem with the development server. Some solutions try to configure the local version as well, still that did not work for me. I decided to look for a servlet that serves static files.

That is it, now you can test your stuff locally and all your scripts, images, styles are loaded by your application. Of course you have to remove this servlet before uploading your application. Hope it helps people with their local debugging of jquery scripts or other javascript things.