array_in_pg

// migration.rb
class AddTransactionsToRsvp < ActiveRecord::Migration
  def change
    add_column :rsvps, :transactions, :string, array: true, default: []
  end
end


// gig_post_helper.rb
  def duration_tag_collection
    GigPost::DURATION_TAGS.each_with_index.collect { |tag, index| [tag, tag.gsub(" ", "_")] }
  end

// view/new_gig_post.html.erb

<%= select_tag("tags[duration]", options_for_select(duration_tag_collection), :prompt => "-- pick a duration --") %>