Retrieve key values from BSON document using Ruby

Question

I'm working with MongoDB using Ruby.

I am able to query a document by doing something like this:

client[:inventory].find({"owner": identity}, projection: {"_id": 0, "group": 1}).each do |doc| 
  #Finds and returns a BSON document matching the query.
  puts doc.to_s
end

However this gives the following key/value pair in String representation:

{"name" => "john"}

How would I retrieve only the value from the returned BSON document, removing the braces and hash rocket, in this case john?

nattfodd · Accepted Answer · 2018-01-30 15:33:03Z

1

Since doc is a simple hash, you can call .values method on it, returning values of the hash. And if you're sure there is only one pair of key-value, or you need only the first one, try this:

- puts doc.to_s
+ puts doc.values.first

answered Jan 30, 2018 at 15:33

nattfodd

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