title: Ruby on Rails Layout reading data from Model
body: <p>I am working on a RoR application and I am working on writing the blog component.  I am planning to have a layout file that will display all of the tags from the database on each page within blog component.  I know how to create and use a different layout file other than application.html.erb, but what I don't know is how to read the tags list from the database for each action in the various controllers.  I would not like to create the appropriate instance variable within each action.  What is an appropriate way to approach this?</p>