为什么我不能使用Ruby驱动程序获得MongoDB2.6文本搜索分数？

Question

mongoDB v2.6.2

宝石'Mongo'，'~>1.10.2'

require 'mongo'
mongo_client = Mongo::MongoClient.new("localhost", 27017)
db = mongo_client.db("mydb")
coll = db.collection("testCollection")

coll.find({ "$text" => { "$search" => "one two three" } }).to_a

coll.find({ "$text" => { "$search" => "one two three" } }, { "score" => { "$meta" => "textScore" }}).to_a

RuntimeError：未知选项[{“score”=>{“$meta”=>“textscore”}}]

Answer 1

投影的字段选择与ruby驱动程序的工作方式略有不同。您需要将投影指定为:fields:

require 'mongo'
include Mongo

client = MongoClient.new
db = client['test']
coll = db['text']

puts coll.find(
  { "$text" => { "$search" => "one two three" } },
  { :fields => [{ "score" => { "$meta" => "textScore" } }] }
).to_a