module Sequel::Plugins::Tree::ClassMethods

  1. lib/sequel/plugins/tree.rb
Parent: Tree

Attributes

parent_column [RW]

The symbol for the column containing the value pointing to the parent of the leaf.
tree_order [RW]

The column symbol or array of column symbols on which to order the tree.

Public Instance methods

inherited (subclass)

Copy the parent_column and order_column to the subclass.

[show source] 
# File lib/sequel/plugins/tree.rb, line 59
def inherited(subclass)
  super
  subclass.parent_column = parent_column
  subclass.tree_order = tree_order 
end
roots ()

Returns list of all root nodes (those with no parent nodes).

TreeClass.roots # => [root1, root2]
[show source] 
# File lib/sequel/plugins/tree.rb, line 68
def roots
  roots_dataset.all
end
roots_dataset ()

Returns the dataset for retrieval of all root nodes

TreeClass.roots_dataset => Sequel#Dataset
[show source] 
# File lib/sequel/plugins/tree.rb, line 75
def roots_dataset
  ds = filter(parent_column => nil)
  ds = ds.order(*tree_order) if tree_order
  ds
end