CiviCRM Community Forums (archive)

Note: I asked this question on the Stack Exchange (http://civicrm.stackexchange.com/questions/10166/civi-ajax-api-search-by-anding-2-tags) But came up empty.

I would like to search the Civi API for Contacts that have both of two tags. I'm at a loss as to how to do this. Right now if you provide multiple tags, the default is to use an OR operation. For example:

CRM.api3('Contact', 'get', {
  "sequential": 1,
  "tag": [5,7]
  "return": ["tag","first_name"]
}).done(function(result) {
  // do something
});
Returns all of the contacts that have either tag with ID=5 OR tag with ID=7. I have also tried using the IN and BETWEEN operations, to no avail.  This piece of functionality is pretty crucial to the tool I'm building, because the workaround I can think of is to fetch all the (several thousand) contacts who have both tags, get them on client side, and parse through it to find all who have both tags.  This is super computationally-intensive on both the server side (large SQL query + constructing huge JSON) and the client side (parsing through a several-thousand element array).  Any leads as to how to work around this, or how to get this functionality working would very much help me out. 

Thank you!