rails (3.2.8)
mongo (1.6.4)
moped (1.2.1)
mongoid (3.0.6)

A EOFError occurred:

  end of file reached
  moped (1.2.1) lib/moped/bson/extensions/hash.rb:12:in `readbyte'


  moped (1.2.1) lib/moped/bson/extensions/hash.rb:12:in `readbyte'
  moped (1.2.1) lib/moped/bson/extensions/hash.rb:12:in `__bson_load__'
  moped (1.2.1) lib/moped/bson/document.rb:7:in `deserialize'
  moped (1.2.1) lib/moped/connection.rb:106:in `block (2 levels) in read'
  moped (1.2.1) lib/moped/connection.rb:105:in `times'
  moped (1.2.1) lib/moped/connection.rb:105:in `each'
  moped (1.2.1) lib/moped/connection.rb:105:in `map'
  moped (1.2.1) lib/moped/connection.rb:105:in `block in read'
  moped (1.2.1) lib/moped/connection.rb:169:in `with_connection'
  moped (1.2.1) lib/moped/connection.rb:86:in `read'
  moped (1.2.1) lib/moped/protocol/query.rb:140:in `receive_replies'
  moped (1.2.1) lib/moped/connection.rb:125:in `block in receive_replies'
  moped (1.2.1) lib/moped/connection.rb:124:in `map'
  moped (1.2.1) lib/moped/connection.rb:124:in `receive_replies'
  moped (1.2.1) lib/moped/node.rb:518:in `block (2 levels) in flush'
  moped (1.2.1) lib/moped/node.rb:123:in `ensure_connected'
  moped (1.2.1) lib/moped/node.rb:516:in `block in flush'
  moped (1.2.1) lib/moped/node.rb:531:in `logging'
  moped (1.2.1) lib/moped/node.rb:515:in `flush'
  moped (1.2.1) lib/moped/node.rb:504:in `process'
  moped (1.2.1) lib/moped/node.rb:70:in `command'
  moped (1.2.1) lib/moped/session/context.rb:51:in `block in command'
  moped (1.2.1) lib/moped/session/context.rb:109:in `block in with_node'
  moped (1.2.1) lib/moped/cluster.rb:150:in `block in with_primary'
  moped (1.2.1) lib/moped/node.rb:168:in `ensure_primary'
  moped (1.2.1) lib/moped/cluster.rb:149:in `with_primary'
  moped (1.2.1) lib/moped/session/context.rb:108:in `with_node'
  moped (1.2.1) lib/moped/session/context.rb:50:in `command'
  moped (1.2.1) lib/moped/database.rb:76:in `command'
  moped (1.2.1) lib/moped/query.rb:36:in `count'
  mongoid (3.0.5) lib/mongoid/contextual/mongo.rb:69:in `count'
  mongoid (3.0.5) lib/mongoid/contextual.rb:18:in `count'
  mongoid (3.0.5) lib/mongoid/finders.rb:22:in `count'
  app/models/aaa.rb:8:in `pick'