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May 27th, 2015
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  1.  var existFeed = function(database, feedId, cb) {
  2.         r.db('rethinkdb').table('jobs')
  3.             .filter({
  4.                 type: 'query'
  5.             })
  6.             .filter(function(job) {
  7.                 return job('info')('query').match('^r.db\\("' + database + '"\\)');
  8.             })
  9.             .filter(function(job) {
  10.                 return job('info')('query').match(feedId.toString());
  11.             })
  12.             .run()
  13.             .then(function(value) {
  14.                 cb(value.length > 0);
  15.             });
  16.     };
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