convert array of hashes to csv file

Question

How do you convert an array of hashes to a .csv file?

I have tried

    CSV.open("data.csv", "wb") do |csv|
      @data.to_csv
    end

but it is blank

Answer 1

Try this:

CSV.open("data.csv", "wb") do |csv|
  @data.each do |hash|
    csv << hash.values
  end
end

If you want the first line of the CSV to contain the keys of the hash (a header row), simply do:

CSV.open("data.csv", "wb") do |csv|
  csv << @data.first.keys # adds the attributes name on the first line
  @data.each do |hash|
    csv << hash.values
  end
end

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Please read the comment of @cgenco below: He wrote a monkey patch for the Array class.