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Contents
module Mongoid::Acts::NestedSet
module Rebuild
# Rebuilds the left & rights if unset or invalid. Also very useful for converting from acts_as_tree.
# Warning: Very expensive!
def rebuild!(options = {})
# Don't rebuild a valid tree.
return true if valid?
scope = lambda{ |node| {} }
if acts_as_nested_set_options[:scope]
scope = lambda { |node| node.nested_set_scope.options.merge(node.nested_set_scope.selector) }
end
indices = {}
set_left_and_rights = lambda do |node|
# set left
left = (indices[scope.call(node)] += 1)
# find
node.nested_set_scope.where(parent_field_name => node.id).asc(left_field_name).asc(right_field_name).each { |n| set_left_and_rights.call(n) }
# set right
right = (indices[scope.call(node)] += 1)
node.class.collection.find(:_id => node.id).update(
{"$set" => {left_field_name => left, right_field_name => right}},
{:safe => true}
)
end
# Find root node(s)
root_nodes = self.where(parent_field_name => nil).asc(left_field_name).asc(right_field_name).asc(:_id).each do |root_node|
# setup index for this scope
indices[scope.call(root_node)] ||= 0
set_left_and_rights.call(root_node)
end
end
end
end
Version data entries
8 entries across 7 versions & 3 rubygems