instantiate.rb

instantiate.rb

module Instantiate
  
  def instantiate(created_by, parent = nil, starting_position = nil, starting_page = 0, root_parent = nil, position = 0)
    attrs = {:created_by => created_by, :position => position + 1, 
      :based_on => self, :display_position => nil,
      :root_parent => root_parent, :uncalculated_state => self.state}
    pages_added = 0
    i = if parent.nil?
      Instance.new(attrs)
    else
      parent.children.build(attrs)
    end
    # The first item (the Assessment) needs to be set at position 1 and set the root_parent
    if root_parent.nil?
      pages_added += 1
      root_parent = i
      i.page = 1
    else
      # start on its own page if it is displayable
      if self.displayable?
        pages_added += 1
        i.page = (starting_page + pages_added)
      end
    end
    
    qs_per_page = i.questions_per_page
    qs_per_page = (qs_per_page == 0 ? 1 : qs_per_page)
    
    items_created = 1 # this instance is the first item
    nodes_added = 0 # only questions count as displayable nodes
    question_count = 0 # count of consecutive child questions
    max_page = (i.page || starting_page)
    
    contents_for_instantiation.each do |c|
      if question_count % qs_per_page == 0 and c.kind_of?(Question)
        # start a new page if this is the first question on the page
        pages_added += 1
        question_count = 0
      end
      
      starting_position ||= 1
      
      child, child_nodes, child_pages, child_max_page, child_items_created = c.instantiate(created_by, i, starting_position + nodes_added, starting_page + pages_added, root_parent, position + items_created)
      # reset counter if its a section, increment if question
      question_count = child.kind_of?(Section) ? 0 : question_count + 1
      
      items_created += child_items_created
      nodes_added += child_nodes
      pages_added += child_pages
      max_page = child_max_page
    end
    i.max_page = max_page
    i.question_count = nodes_added
    
    if i == root_parent
      i.save!
      i.update_attribute(:root_parent, i)
    end
    
    return i, nodes_added, ((self.kind_of?(Section) and self.displayable?) ? pages_added + 1 : pages_added), ((self.kind_of?(Section) and self.displayable?) ? max_page + 1 : max_page), items_created
  end
  
end