From Courses controller

Sort_roots.rb

  def sort_roots
    sequence_groups = []
    #turn hash into array
    params[:sequence_groups].each do |k, v|
      sequence_groups << v
    end
    # First, assign the correct group_id 
    root_sequences = []
    sequence_groups.each do |sg|
      group_id = sg.keys[0].to_s.gsub('sequence_group_', '')
      sg.values[0].each do |s|
        sequence_id = s.to_s.gsub("sequence_", "")        
        Sequence.set(sequence_id, :sequence_group_id => group_id )
        root_sequences << sequence_id
      end
    end
  
    #send the array to the method that assigns the position numbers
    root_sequence_array = []
    root_sequences.each do |r|
      root_sequence_array << Sequence.find(r)
    end
    Sequence.reorder_siblings(root_sequence_array)
  end