将哈希数组转换为 Ruby 中的一个 hash

Question

I have an array of hashes with arrays that look something like this:

result = [
  {"id_t"=>["1"], "transcript_t"=>["I am a transcript ONE"]},
  {"id_t"=>["2"], "transcript_t"=>["I am a transcript TWO"]},
  {"id_t"=>["3"], "transcript_t"=>["I am a transcript THREE"]}
]

What I would LIKE to do, if possible, is transform it such that it becomes ONE hash where each key=>value pair is taken from the values of each hash. I don't think I'm explaining that well, so here's what I mean:

end_result = {
  "1"=>"I am a transcript ONE",
  "2"=>"I am a transcript TWO",
  "3"=>"I am a transcript THREE"
}

I've been scouring Stack Overflow and Google for various methods, but I've gotten myself confused in the process. Any ideas on how to achieve this?

Answer 1

I think the key to the solution is Hash[] , which will create a Hash based on an array of key/values, ie

Hash[[["key1", "value1"], ["key2", "value2"]]]
#=> {"key1" => "value1", "key2" => "value2"}

Just add a set of map , and you have a solution!

result = [
  {"id_t"=>["1"], "transcript_t"=>["I am a transcript ONE"]},
  {"id_t"=>["2"], "transcript_t"=>["I am a transcript TWO"]},
  {"id_t"=>["3"], "transcript_t"=>["I am a transcript THREE"]}
]
Hash[result.map(&:values).map(&:flatten)]

Answer 2

Try this

result.inject({}){|acc, hash| acc[hash.values[0][0]] = hash.values[1][0]; acc }

=> { "1"=>"I am a transcript ONE", 
     "2"=>"I am a transcript TWO",
     "3"=>"I am a transcript THREE" } 

Answer 3

Another possibility is using a combo of Enumerable#inject and Hash#merge :

result.inject({}) do |acc, hash|
   acc.merge({hash['id_t'].first => hash['transcript_t'].first})
end
=> { "1"=>"I am a transcript ONE",
     "2"=>"I am a transcript TWO",
     "3"=>"I am a transcript THREE" }

This minimizes the need for [] -constructions, and the additional explicit return appendix of ; acc ; acc .