text: Q:
  
  Displaying attributes of associated models in a datagrid column
  
  I have two models: User and Dog.  I want to be able to show them both in a single Datagrid report. What syntax do I use to refer to a specific attribute of the user model when using the column() method? Right now I am just displaying the User object but I would like to display various columns with :name, :gender and :age attributes of the User model.
  class User < ActiveRecord::Base
    attr_accessible :email, :age, :gender, :name
    has_many :dogs
  
  class Dog < ActiveRecord::Base
    attr_accessible :name, :age
    belongs_to :user
  
  class DogReport
      include Datagrid
  
    #
    # Scope
    #
  
    scope do
      Dog.includes(:user)
    end
  
    #
    # Filters
    #
  
    filter(:dog_id, :integer)
  
    #
    # Columns
    #
  
    column(:id)
    column(:name)
    column(:age)
    column(:user)
  end
  
  A:
  
  column(:user, :header => "user.name") do
    self.user.name
  end
  
  