Method: DTAS::Mlib#root_node

Defined in:
lib/dtas/mlib.rb

#root_node ⇒ Object 



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# File 'lib/dtas/mlib.rb', line 231

def root_node
  q = @root_node and return q
  # root node always has parent_id: 1
  q = {
    parent_id: 1, # self
    name: '',
  }
  node = @db[:nodes][q]
  if node
    node[:dirname] = ''
    @root_node = node
    return node
  end
  begin
    q[:tlen] = DM_DIR
    q[:id] = @db[:nodes].insert(q)
    q
  rescue Sequel::DatabaseError
    # we may conflict on insert if we didn't use a transaction
    raise if @db.in_transaction?
    @root_node = @db[:paths][q] or raise
  end
end