Module: ClosureTree::Finders

Extended by:
ActiveSupport::Concern
Defined in:
lib/closure_tree/finders.rb

Defined Under Namespace

Modules: ClassMethods

Instance Method Summary collapse

Instance Method Details

#find_all_by_generation(generation_level) ⇒ Object 



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# File 'lib/closure_tree/finders.rb', line 36

def find_all_by_generation(generation_level)
  s = _ct.base_class.joins(<<-SQL.strip_heredoc)
    INNER JOIN (
      SELECT descendant_id
      FROM #{_ct.quoted_hierarchy_table_name}
      WHERE ancestor_id = #{_ct.quote(self.id)}
      GROUP BY descendant_id
      HAVING MAX(#{_ct.quoted_hierarchy_table_name}.generations) = #{generation_level.to_i}
    ) AS descendants ON (#{_ct.quoted_table_name}.#{_ct.base_class.primary_key} = descendants.descendant_id)
  SQL
  _ct.scope_with_order(s)
end

#find_by_path(path, attributes = {}) ⇒ Object

Find a descendant node whose ancestry_path will be “‘self.ancestry_path + path“`



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# File 'lib/closure_tree/finders.rb', line 6

def find_by_path(path, attributes = {})
  return self if path.empty?
  self.class.find_by_path(path, attributes, id)
end

#find_or_create_by_path(path, attributes = {}) ⇒ Object

Find or create a descendant node whose ancestry_path will be “‘self.ancestry_path + path“`



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# File 'lib/closure_tree/finders.rb', line 12

def find_or_create_by_path(path, attributes = {})
  subpath = _ct.build_ancestry_attr_path(path, attributes)
  return self if subpath.empty?

  found = find_by_path(subpath, attributes)
  return found if found

  attrs = subpath.shift
  _ct.with_advisory_lock do
    # shenanigans because children.create is bound to the superclass
    # (in the case of polymorphism):
    child = self.children.where(attrs).first || begin
      # Support STI creation by using base_class:
      _ct.create(self.class, attrs).tap do |ea|
        # We know that there isn't a cycle, because we just created it, and
        # cycle detection is expensive when the node is deep.
        ea._ct_skip_cycle_detection!
        self.children << ea
      end
    end
    child.find_or_create_by_path(subpath, attributes)
  end
end

#without_self(scope) ⇒ Object 



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# File 'lib/closure_tree/finders.rb', line 49

def without_self(scope)
  scope.without_instance(self)
end