Module: TheSortableTreeHelper

Defined in:
app/helpers/the_sortable_tree_helper.rb

Instance Method Summary collapse

Instance Method Details

#define_class_of_elements_of(tree) ⇒ Object

sortable_tree @pages, :new_url => new_page_url, :max_levels => 5

sortable_tree @products, :new_url => new_product_url, :path => ‘products/the_sortable_tree’

sortable_tree @catalogs, :namespace => :admin, :new_url => new_catalog_url, :max_levels => 5



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# File 'app/helpers/the_sortable_tree_helper.rb', line 12

def define_class_of_elements_of tree
  case
    #when tree.is_a?(ActiveRecord::Relation) then tree.name.to_s.downcase
    when tree.empty? then nil
    else tree.first.class.to_s.underscore
  end
end

#sortable_tree(tree, opts = {}) ⇒ Object 



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# File 'app/helpers/the_sortable_tree_helper.rb', line 20

def sortable_tree(tree, opts= {})
  opts.merge!({
    :path  => opts[:path] || :the_sortable_tree,
    :klass => define_class_of_elements_of(tree),
    :title => opts[:title] || :title,
    :max_levels => opts[:max_levels] || 3,
    :namespace => Array.wrap(opts[:namespace])
  })
  render :partial => "#{opts[:path]}/tree", :locals => { :tree => sortable_tree_builder(tree, opts), :opts => opts }
end

#sortable_tree_builder(tree, options = {}) ⇒ Object 



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# File 'app/helpers/the_sortable_tree_helper.rb', line 31

def sortable_tree_builder(tree, options= {})
  result = ''
  opts = {
    :id => :id,           # node id field
    :node => nil,         # node
    :root => false,       # is it root node?
    :level => 0           # recursion level
  }.merge!(options)

  root = opts[:root]
  node = opts[:node]

  unless node
    roots = tree.select{ |elem| elem.parent_id.nil? }

    # TODO: try to remove compact
    # children rendering
    if roots.empty? && !tree.empty?
      min_parent_id = tree.map(&:parent_id).compact.min
      roots = tree.select{ |elem| elem.parent_id == min_parent_id }
    end

    roots.each do |root|
      _opts  =  opts.merge({:node => root, :root => true, :level => opts[:level].next})
      result << sortable_tree_builder(tree, _opts)
    end
  else
    children_res = ''
    children = tree.select{|elem| elem.parent_id == node.id}
    opts.merge!({:has_children => children.blank?})
    children.each do |elem|
      _opts        =  opts.merge({:node => elem, :root => false, :level => opts[:level].next})
      children_res << sortable_tree_builder(tree, _opts)
    end
    result << render(:partial => "#{opts[:path]}/node", :locals => {:opts => opts, :root => root, :node => node, :children => children_res})
  end
  raw result
end