google app engine - 3 Models Entity Joins in AppEngine Python -

I have read a lot about how I need to re-apply the institutions for the development of APN Egen and need to be involved, and I still know how to do this:

I have 3 entities, many tweets and users follow the many tags in tags Please.

I would like to receive all those tweets that are tagged with tags that follow a user.

I thought destroying the tag unit and using StringListProperty might work in this form:

  Tweets.all ( ). Filter (â ???? tag INA ????, user.tags)   
 However, the list has been indicated as a priority, it does not work! Because one query can not compare two lists.  
 
 A query can not compare two list values. There is no way to test two lists for equality without having to test each element separately for membership.   
 How to organize institutions with any thought so that I can answer this question:         
 
 
 You have two lists Are not trying to compare - you are investigating the intersection, the query that you write will do this with a major warning: These filters are divided into several sub-questions, which can be found in up to 30 sub-questions With And by independently executed.  
 This, if your user follows 3 tags ['Foo', 'Bar', 'False'], then the unit is equal to the following:  
  tag all (). Filter ('tag =', 'bar'). All (). Filters ('Tag =', 'Falcon')