Group array of hashes by key

Question

I have an array consisting of hashes in the following form:

[
  {:user=>"mike" etc},
  {:user=>"mike" etc},
  {:user=>"peter" etc},
  {:user=>"joe" etc}
]

Are there any convenient ways to split the group according to the value of user key? The final result should be something like this:

[
  [{:user=>"mike" etc}, {:user=>"mike" etc}],
  [{:user=>"peter" etc}],
  [{:user=>"joe" etc}]
]

Answer 1

Use group_by.

array.group_by{|h| h[:user]}.values