moped examples

moped_examples.rb

session = Moped::Session.new(["127.0.0.1:27017"], database: "mongodb")
session[:collection].find.one
# => {
#   "_id"=>"500b7c0d1d41c81647000016",
#   "name"=>"a photo",
#   "updated_at"=>2012-07-22 04:05:33 UTC,
#   "created_at"=>2012-07-22 04:05:33 UTC
# }

session[:collection].find.select(name: false).one
# => {
#   "_id"=>"500b7c0d1d41c81647000016",
#   "updated_at"=>2012-07-22 04:05:33 UTC,
#   "created_at"=>2012-07-22 04:05:33 UTC
# }

session[:collection].find.limit(2).select(name: 0).to_a
# =>
#   [
#     {
#       "_id"=>"500b7c0d1d41c81647000016",
#       "updated_at"=>2012-07-22 04:05:33 UTC,
#       "created_at"=>2012-07-22 04:05:33 UTC
#     },
#     {
#       "_id"=>"500b7c9c1d41c8164700002a",
#       "updated_at"=>2012-07-22 04:07:56 UTC,
#       "created_at"=>2012-07-22 04:07:56 UTC
#     }
#   ]

session[:collection].find.limit(2).select(name: 1).to_a
# =>
#   [
#     {
#       "_id"=>"500b7c0d1d41c81647000016",
#       "name"=>"a photo"
#     },
#     {
#       "_id"=>"500b7c1b1d41c8164700001a",
#       "name"=>"aaaaaaa"
#     }
#   ]