how can I iterate through this json document using ruby? - ruby

Question

I have a ruby code block, as follows:
require "elasticsearch"
require "json"
search_term = "big data"
city = "Hong Kong"
client = Elasticsearch::Client.new log: true
r = client.search index: 'candidates', body:
{
query: {
bool: {
must: [
{
match: {
tags: search_term
}
},
{
match: {
city: city
}
}
]
}
}
}
It produces multiple returns like this one:
{"_index":"candidates","_type":"data",
"_id":"AU3DyAmvtewNSFHuYn88",
"_score":3.889237,
"_source":{"first":"Kota","last":"Okayama","city":"Tokyo","designation":"Systems Engineer","email":"user#hotmail.co.jp","phone":"phone","country":"Japan","industry":"Technology","tags":["remarks","virtualization big data"]}}
I want to iterate through it and extract various elements. I have tried
data = JSON.parse(r)
data.each do |row|
puts row["_source"]["first"]
end
and the error is:
no implicit conversion of Hash into String (TypeError)
What's the best way forward on this chaps?

Answer 1

I have the solution, I hope it helps somebody else. It took me hours of fiddling and experimentation. Here it is:
require "elasticsearch"
require "json"
search_term = "big data"
city = "Tokyo"
client = Elasticsearch::Client.new log: true
h = client.search index: 'swiss_candidates', body:
{
query: {
bool: {
must: [
{
match: {
tags: search_term
}
},
{
match: {
city: city
}
}
]
}
}
}
data = JSON.parse(h.to_json)
data["hits"]["hits"].each do |r|
puts r["_id"]
puts r["_source"]["first"]
puts r["_source"]["tags"][1]
puts r["_source"]["screened"][0]
end
The important thing seems to be to convert the elasticsearch result into something ruby friendly.

Answer 2

JSON.parse expects a String containing a JSON document, but you are passing it the Hash which was returned from client.search.
I'm not entirely sure what you are trying to achieve with that, why you want to parse something which is already a Ruby Hash into a Ruby Hash.