Module: Julik::MakeLikeTree::ClassMethods

Defined in:
lib/make_like_a_tree.rb

Instance Method Summary collapse

Instance Method Details

#make_like_a_tree(options = {}) ⇒ Object

An acts_as_threaded on steroids. Configuration options are:

  • root_column - specifies the column name to use for identifying the root thread, default “root_id”

  • parent_column - specifies the column name to use for keeping the position integer, default “parent_id”

  • left_column - column name for left boundary data, default “lft”

  • right_column - column name for right boundary data, default “rgt”

  • depth - column name used to track the depth in the branch, default “depth”

  • scope - adds an additional contraint on the threads when searching or updating



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# File 'lib/make_like_a_tree.rb', line 26

def make_like_a_tree(options = {})
  configuration = { :root_column => "root_id", :parent_column => "parent_id", :left_column => "lft", :right_column => "rgt", :depth_column => 'depth', :scope => "(1=1)" }
  configuration.update(options) if options.is_a?(Hash)
  configuration[:scope] = "#{configuration[:scope]}_id".intern if configuration[:scope].is_a?(Symbol) && configuration[:scope].to_s !~ /_id$/

  if configuration[:scope].is_a?(Symbol)
    scope_condition_method = %(
      def scope_condition
        if #{configuration[:scope].to_s}.nil?
          "#{configuration[:scope].to_s} IS NULL"
        else
          "#{configuration[:scope].to_s} = \#{#{configuration[:scope].to_s}}"
        end
      end
    )
  else
    scope_condition_method = "def scope_condition() \"#{configuration[:scope]}\" end"
  end
  
  after_create :apply_parenting_after_create
  
  
 # before_update :register_parent_id_before_update, :unless => :new_record?
#  after_update :replant_after_update
  
  # TODO: refactor for class << self
  class_eval <<-EOV
    include Julik::MakeLikeTree::InstanceMethods

    #{scope_condition_method}

    def root_column() "#{configuration[:root_column]}" end
    def parent_column() "#{configuration[:parent_column]}" end
    def left_col_name() "#{configuration[:left_column]}" end
    def right_col_name() "#{configuration[:right_column]}" end
    def depth_column() "#{configuration[:depth_column]}" end

  EOV
end