I consider to use the built in Category class for implementing tags for one of my datastore classes. Something like: . import com.google.appengine.api.datastore.Category; . @Persistent protected List<Category> tags; . My question is how do I filter objects by a tag value, for example I want to get all objects that have a 'pollution' tag. Actually, there are here two questions: 1. How to query by fields that are lists (or collections)? 2. How to use Category class in queries ?
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