Dlaw Dlaw - 1 year ago 91
Ruby Question

Ruby arrays and hash multi-dimensional issues

I have created an array of hashes that I want to access. I have actually been able to access the first two items but going through the third is where I couldn't...the code is below. I have tried to get it from related topics but they are as different as a Salmon is different from Fish.

arry =[{"A"=>{"name"=>"B","id"=>1,"sub"=>[{"name"=>"C","id"=>1},{"name"=>"D","id"=>2}]}}]


I have been able to pass through A to B by using this code:

print arry[0]['A']['name']


and I got "B"

now how do I get something like

"A B C" OR "A B D"?

Answer Source

The following returns ["A", "B", "C", "D"]:

#for trying out in `irb` this is fine, but I would recommend refactoring to smaller methods
[].tap do |result|
  result << arry[0].keys
  second_level_hash_names = arry.map {|hash| hash.values.map {|values_hash| values_hash["name"]}}.flatten
  third_level_hash_names = arry.map {|hash| hash.values.map {|values_hash| values_hash["sub"].map {|sub_hash| sub_hash["name"]}}}.flatten
  result << second_level_hash_names << third_level_hash_names
end.flatten

In your question you ask for ""A B C" OR "A B D"?" but I'm not sure which you're looking for and whether "C" or "D" is arbitrary. You can play with this code in irb and modify for your use case.

Recommended from our users: Dynamic Network Monitoring from WhatsUp Gold from IPSwitch. Free Download