How to access a multi dimensional array with a variable string?

Question

Out of the following the last one does not work:

puts node.elasticsearch[:plugin][:jetty][:name]
puts node.elasticsearch[:plugin]['jetty'][:name]
puts node.elasticsearch[:plugin]["'#{entry}'"][:name]

What syntax do I need to follow in order to use a variable's value in the index when accessing a multi dimensional array?

UPDATE: I think entry is a String but I could be wrong so here's the statement that sets it up for you the educated helper to determine what's what:

Dir.entries("/var/plugins/").any? do |entry|
    puts node.elasticsearch[:plugin][:jetty][:name]
    puts node.elasticsearch[:plugin]['jetty'][:name]
    puts node.elasticsearch[:plugin]["'#{entry}'"][:name]
end

philant · Accepted Answer · 2012-05-27 19:14:46Z

1

Your hash is indexed with symbols, so you should convert your string into a symbol, with entry.intern().

puts node.elasticsearch[:plugin][entry.intern][:name]

Edit: to_sym and intern are aliases of the String class. So entry has to be a string, which it seems to be according to your attempts.

edited May 27, 2012 at 19:14

answered May 27, 2012 at 18:54

philant

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thesis · Accepted Answer · 2012-05-27 18:53:12Z

1

You should have a key String in your hash, but it look like you have symoblized keys in hour hash. In this case, convert your string to Symbol, before you use it as a key.

Try this code:

puts node.elasticsearch[:plugin][entry.to_sym][:name]

answered May 27, 2012 at 18:53

thesis

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1 Comment

pulkitsinghal Over a year ago

sorry i didn't scroll down and ended up using the answer from @philant before i ever saw yours ...

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