Module: SnapshotTree::ActsAsTree::ClassMethods

Defined in:
lib/snapshot_tree/acts_as_tree.rb

Instance Method Summary collapse

Instance Method Details

#acts_as_tree(opts = {}) ⇒ Object 



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# File 'lib/snapshot_tree/acts_as_tree.rb', line 43

def acts_as_tree(opts = {})
  options = {
    parent_key:      :parent_id,
    child_key:       :child_id,
    snapshot_field:  :effective_on,
    is_active_field: :is_active,
    node_prefix:     :node,
    dependent:       :nullify
  }.merge(opts)

  options[:model_class] = self.name
  options[:model_table] = options[:model_class].tableize
  options[:join_class]  = "#{self.name}Tree" unless options[:join_class]
  options[:join_class]  = options[:join_class].to_s
  options[:join_table]  = options[:join_class].tableize

  instance_variable_set :@tree_helper, TreeHelper.new(options)

  has_many :parent_tree_nodes,
    -> { where(options[:is_active_field].to_sym => true) if options[:is_active_field] },
    class_name:  options[:join_class],
    foreign_key: options[:child_key],
    autosave:    true,
    dependent:   options[:dependent]

  has_many :child_tree_nodes,
    -> { where(options[:is_active_field].to_sym => true) if options[:is_active_field] },
    class_name:  options[:join_class],
    foreign_key: options[:parent_key],
    autosave:    true,
    dependent:   options[:dependent]

  "#{options[:node_prefix]}_depth".to_sym.tap do |field|
    define_method(field) do
      read_attribute(field).try(:to_i)
    end
  end

  "#{options[:node_prefix]}_path".to_sym.tap do |field|
    define_method(field) do
      read_attribute(field).gsub(/[{}]/, '').split(',').map(&:to_i) if read_attribute(field)
    end
  end
end

#ancestor_nodes(*args) ⇒ Object 



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# File 'lib/snapshot_tree/acts_as_tree.rb', line 120

def ancestor_nodes(*args)
  opts = @tree_helper.parse_args(*args)

  sql = @tree_helper.nodes_query(:ancestor)
  sql = sql.gsub(/__model_id__/, opts[:model_id].to_s)
  sql = sql.gsub(/__snapshot_value__/, opts[:as_of].to_s(format: :db)) if @tree_helper.snapshot_field?

  query = self.unscoped.from(sql)
  query = query.where("#{@tree_helper.node_field(:depth)} <= #{opts[:depth]}") if opts[:depth] > 0
  query = query.order("#{@tree_helper.node_field(:depth)} DESC")
end

#descendent_nodes(*args) ⇒ Object Also known as: descendant_nodes 



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# File 'lib/snapshot_tree/acts_as_tree.rb', line 106

def descendent_nodes(*args)
  opts = @tree_helper.parse_args(*args)

  sql = @tree_helper.nodes_query(:descendent)
  sql = sql.gsub(/__model_id__/, opts[:model_id].to_s)
  sql = sql.gsub(/__snapshot_value__/, opts[:as_of].to_s(format: :db)) if @tree_helper.snapshot_field?

  query = self.unscoped.from(sql)
  query = query.where("#{@tree_helper.node_field(:depth)} <= #{opts[:depth]}") if opts[:depth] > 0
  query = query.order("#{@tree_helper.node_field(:path)}")
end

#leaf_nodes(*args) ⇒ Object 



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# File 'lib/snapshot_tree/acts_as_tree.rb', line 97

def leaf_nodes(*args)
  opts = @tree_helper.parse_args(*args)

  sql = @tree_helper.nodes_query(:leaf)
  sql = sql.gsub(/__snapshot_value__/, opts[:as_of].to_s(format: :db)) if @tree_helper.snapshot_field?

  self.unscoped.from(sql).order('1')
end

#root_nodes(*args) ⇒ Object 



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# File 'lib/snapshot_tree/acts_as_tree.rb', line 88

def root_nodes(*args)
  opts = @tree_helper.parse_args(*args)

  sql = @tree_helper.nodes_query(:root)
  sql = sql.gsub(/__snapshot_value__/, opts[:as_of].to_s(format: :db)) if @tree_helper.snapshot_field?

  self.unscoped.from(sql).order('1')
end