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Sequel::Plugins::Tree::ClassMethods

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) click to toggle source

Copy the parent_column and order_column to the subclass.

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

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

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

Returns the dataset for retrieval of all root nodes

TreeClass.roots_dataset => Sequel#Dataset
# 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

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