如何通过哈希值在哈希内的哈希数组中搜索？

Question

I am new to ruby and Mongo and am looking for an answer to this...

I have a mongo database of records that contains records like this - with hashes embedded within hashes embedded within array

{
  "id =>1",
  "address" =>[
    {
      "number" => 1404,
      "street" =>"jasmine",
      "city" => "NY",
      "state" => "NY",
      "zip" => "02941"
    }, 
    {
      "number" => 2400,
      "street" =>"miner",
      "city" => "Boston",
      "state" => "MA",
      "zip" => "02760"
    },
    {etc..}
  ], 
  "geo" => { "lat" => 33.875, "lon" => -116.301 }     
  "first_name"=> "joe",
  "last_name" =>  "smith"
}

{ 
  "id" =>"2",
  "address" =>[{...},{...}, etc ],
  "geo" => {"lat" => 32.875, "lon" => -115.301 }, 
  "first_name"=> "john",
  "last_name"=>"doe"
} 

and I want to find/return all records that include "street" == "jasmine", how do I reference "street" inside the find criteria?

Answer 1

if you're looping through each object:

objects_on_jasmine_street = []

NameOfObject.find_each do |object|
  if object['address'][0]['street'] # this will return street
     object_on_jasmine_street << object
  end
end

objects_on_jasmine_street

Answer 2

I believe searching array attributes in Mongo is pretty slow - consider converting your hashes for addresses into object instances. Then simply search as usual on your Address object rather than your User object. Also you may consider indexing the street attribute on your Address object so that it becomes faster when searching.