Module: SuperSTI::Hook

Defined in:
lib/super_sti/hook.rb

Instance Method Summary collapse

Instance Method Details

#has_extra_data(options = {}, &block) ⇒ Object

has_extra_data(options = {})

In it’s most raw form, this method creates an associated Data class, which seamlessly adds attributes and methods to the main class

If passed a block, extra attributes can be set on the data table, methods (e.g. has_many) can be called, and other methods can be defined.

Options:

table_name: The table name of the class



16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
 
# File 'lib/super_sti/hook.rb', line 16

def has_extra_data(options = {}, &block)

  table_name = options[:table_name] || "#{self.name.underscore.gsub("/", "_")}_data"
  klass = Class.new(ActiveRecord::Base) do
    set_table_name(table_name)
  end
  klass.class_eval &block if block_given?
  self.const_set "Data", klass
  
  # Add a reference to a data object that gets created when this is created
  has_one :data, :class_name => "#{self.name}::Data", :foreign_key => options[:foreign_key]
  before_create :get_data
  
  # A helper method which gets the existing data or builds a new object
  define_method :get_data do
    data || build_data
  end
  
  # Override respond_to? to check both this object and its data object.
  define_method "respond_to?" do |sym, include_private = false|
    super(sym, include_private) || get_data.respond_to?(sym, include_private)
  end
  
  # Override method_missing to check both this object and it's data object for any methods or magic functionality.
  # Firstly, try the original method_missing because there may well be 
  # some magic piping that will return a result and then try the data object.
  define_method :method_missing do |sym, *args|
    begin
      super(sym, args)
    rescue
      get_data.send(sym, *args)
    end
  end
end