Getting Specific Value From Nested Hash in Ruby

Question

I have a hash that looks like this:

get_fru = 
  {"default_fru_device"=>
    {:name=>"default_fru_device",
    "chassis_type"=>"Other",
    "board_manufacturer"=>"IBM",
    "product_name"=>"System x3650 M4"
    }
   }

I know that if I wanted to get the value of product_name, I could simply do get_fru["default_fru_device"]["product_name"] which would, in this example, return System x3650 M4.

However, If I wanted to get the values IBM and System x3650 M4 and make them display as a single string that said IBM System x3650 M4, how would I go about achieving that?

You want to concatenate strings in ruby? If so, you can use "#{get_fru["default_fru_device"]["board_manufacturer"]} #{get_fru["default_fru_device"]["product_name"]}" — luiscrjr
– luiscrjr, Commented Jan 27, 2017 at 22:35
You can use + (concatenates when used with String): my_string = get_fru["default_fru_device"]["board_manufacturer"]} + " " + get_fru["default_fru_device"]["product_name"]. But @EricDuminil's answer is great. — luiscrjr
– luiscrjr, Commented Jan 27, 2017 at 22:38
@EricDuminil Sorry, I forgot to include "System". Was a typo. — Wes
– Wes, Commented Jan 27, 2017 at 22:49

Eric Duminil · Accepted Answer · 2017-01-27 22:40:47Z

2

You could use Hash#values_at and Array#join :

get_fru["default_fru_device"].values_at('board_manufacturer', 'product_name').join(' ')
#=> "IBM System x3650 M4"

edited Jan 27, 2017 at 22:40

answered Jan 27, 2017 at 22:37

Eric Duminil

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1 Comment

Wes Over a year ago

Thanks - nice and clean. Was what I was looking for.

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