RoR Check Missing FK

# Establish connection
conn = ActiveRecord::Base.connection
# Cycle tables
conn.tables.collect do |t|  
  # Gather columns
  columns = c.columns(t).collect(&:name).select {|x| x.ends_with?("_id" || x.ends_with("_type"))}
  # Collect all indexed
  indexed_columns = c.indexes(t).collect(&:columns).flatten.uniq
  # Identify unindexed
  unindexed = columns - indexed_columns
  # Display
  unless unindexed.empty?
    puts "#{t}: #{unindexed.join(", ")}"
  end
end