Convert hash keys to lowercase -- Ruby Beginner

Question

My table field names are lowercase and the field names I get from CSV files are camelcase. Is there anyway I can convert the keys of an array of hashes to lowercase?

Here is the code I have right now:

    CSV.foreach(file, :headers => true) do |row|
      Users.create!(row.to_hash)
    end

This is failing because the keys are camel case (I've verified this by manually editing the file to make the header row all lowercase).

PS. Also I would love to know why the hell rails takes table field names' case sensitivity into play to begin with?

Answer 1

You can simple do

hash.transform_keys(&:downcase)

to change hash keys to lowercase, or you can also transform hash values to lowercase or upper case as per your requirement.

hash.transform_values(&:downcase) or hash.transform_values(&:upcase)

hash = {:A=>"b", :C=>"d", :E=>"f"}
hash.transform_keys(&:downcase)
=> {:a=>"b", :c=>"d", :e=>"f"}