This code works on mongo-ruby-driver 2.1.2 but fails on 2.2.0-rc0:

<code>
MyModel.class.collection.find({:_id => model.id}).update_one(:$set => {"foo" => {1 => "2"}})
<code>

error:

<code>
ongo::Error::SocketError: end of file reached
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/socket.rb:195:in `rescue in handle_errors'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/socket.rb:190:in `handle_errors'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/socket.rb:122:in `read'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/protocol/message.rb:106:in `deserialize'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/server/connectable.rb:107:in `block in read'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/server/connectable.rb:91:in `ensure_connected'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/server/connectable.rb:106:in `read'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/server/connection.rb:190:in `deliver'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/server/connection.rb:135:in `block in dispatch'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/monitoring/publishable.rb:47:in `publish_command'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/server/connection.rb:134:in `dispatch'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/operation/write/command/writable.rb:38:in `block in execute'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/server/connection_pool.rb:111:in `with_connection'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/server/context.rb:63:in `with_connection'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/operation/write/command/writable.rb:37:in `execute'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/operation/write/write_command_enabled.rb:48:in `execute_write_command'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/operation/write/write_command_enabled.rb:38:in `execute'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/collection/view/writable.rb:209:in `block in update'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/retryable.rb:89:in `call'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/retryable.rb:89:in `write_with_retry'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/collection/view/writable.rb:199:in `update'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongo-ruby-driver-4119e1fb5cf7/lib/mongo/collection/view/writable.rb:182:in `update_one'
from /usr/local/lib/ruby/gems/2.2.0/bundler/gems/mongoid-775da327de64/lib/mongoid/query_cache.rb:168:in `update_one_with_clear_cache'
<code>

Isn't bothering us, this was just in one of our specs. I don't know where the changelog is for this driver, so not sure if it's expected.