Extracting Data from array of hashes Ruby

Question

Given that I have the following array of hashes

@response =  { "0"=>{"forename_1"=>"John", "surname_1"=>"Smith"}, 
               "1"=>{"forename_1"=>"Chris", "surname_1"=>"Jenkins"}, 
               "2"=>{"forename_1"=>"Billy", "surname_1"=>"Bob"},
               "Status" => 100
             }

I am looking to create an array of the forename_1 and surname_1 values combined, so desired output would be

["John Smith", "Chris Jenkins", "Billy Bob"]

So I can get this far, but need further assistance

# Delete the Status as not needed
@response.delete_if { |k| ["Status"].include? k }

@response.each do |key, value|
  puts key
  #This will print out 0 1 2
  puts value
  # This will print {"forename_1"=>"John", "surname_1"=>"Smith"}, "{"forename_1"=>"Chris", "surname_1"=>"Jenkins"}, "{"forename_1"=>"Billy", "surname_1"=>"Bob"}
  puts value.keys
 # prints ["forename_1", "surname_1"], ["forename_1", "surname_1"], ["forename_1", "surname_1"] 
  puts value.values
  # prints ["John", "Smith"], ["Chris", "Jenkins"], ["Billy", "Bob"] 
  value.map { |v| v["forename_1"] }
  # However i get no implicit conversion of String into Integer error
end

What am i doing wrong here?

Thanks

jon snow · Accepted Answer · 2015-04-16 15:40:45Z

2

Another way :

@response.values.grep(Hash).map { |t| t.values.join(' ')}

answered Apr 16, 2015 at 15:40

jon snow

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1 Comment

hirolau Over a year ago

Only works if he KNOWS that the values of that hash always comes in that order. The order is fixed in ruby but the data might come from other sources.

toro2k · Accepted Answer · 2015-04-16 15:41:00Z

1

What you have to do is to get the values of the @response hash, filter out what is not an instance of Hash, and then join together the forename and the surname, I would do something like this:

@response.values.grep(Hash).map { |h| "#{h['forename_1']} #{h['surname_1']}" }
# => ["John Smith", "Chris Jenkins", "Billy Bob"]

answered Apr 16, 2015 at 15:41

toro2k

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1 Comment

Richlewis Over a year ago

Thanks, that's a neat way of putting it together

Saurabh · Accepted Answer · 2015-04-16 15:26:51Z

1

@response.values.map{ |res| 
   [res["forename_1"] , res["surname_1"]].join(' ')  if res.is_a?(Hash)  
}.compact

answered Apr 16, 2015 at 15:26

Saurabh

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