Simple, but useful, methods to manipulate an array of hashes.

array.rb

class Array
  def pluck(key)
    map { |h| h[key] }
  end

  # a = [
  #  {id: 1, name: 'John' },
  #  {id: 2, name: 'Doe'  },
  #  {id: 3, name: 'John' },
  #  {       name: 'Doe'  }
  # ]
  #
  # a.select_by(name: 'John', id: 1)
  # => [{:id=>1, :name=>"John"}]
  #
  # a.select_by(id: /\d/)
  # => [{:id=>1, :name=>"John"}, {:id=>2, :name=>"Doe"}, {:id=>3, :name=>"John"}]
  #
  def select_by(args)
    select do |h|
      args.map do |k, v|
        v.is_a?(Regexp) ? v === h[k].to_s : v == h[k]
      end.all?
    end
  end

  # Similar to #select_by, but using #detect logic
  #
  def detect_by(args)
    detect do |h|
      args.map do |k, v|
        v.is_a?(Regexp) ? v === h[k].to_s : v == h[k]
      end.all?
    end
  end
end