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# File 'lib/comfortable_mexican_sofa/extensions/acts_as_tree.rb', line 8
def cms_acts_as_tree(options = {})
configuration = {
:foreign_key => 'parent_id',
:order => nil,
:counter_cache => nil,
:dependent => :destroy,
:touch => false }
configuration.update(options) if options.is_a?(Hash)
belongs_to :parent,
:class_name => name,
:foreign_key => configuration[:foreign_key],
:counter_cache => configuration[:counter_cache],
:touch => configuration[:touch]
has_many :children,
-> { order(configuration[:order])},
:class_name => name,
:foreign_key => configuration[:foreign_key],
:dependent => configuration[:dependent]
class_eval <<-EOV
include ComfortableMexicanSofa::ActsAsTree::InstanceMethods
scope :roots, -> {
where("#{configuration[:foreign_key]} IS NULL").
order(#{configuration[:order].nil? ? "nil" : %Q{"#{configuration[:order]}"}})
}
def self.root
roots.first
end
validates_each "#{configuration[:foreign_key]}" do |record, attr, value|
if value
if record.id == value
record.errors.add attr, "cannot be it's own id"
elsif record.descendants.map {|c| c.id}.include?(value)
record.errors.add attr, "cannot be a descendant's id"
end
end
end
EOV
end
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