Class: Og::RefersTo

Inherits:
Relation show all
Defined in:
lib/og/relation/refers_to.rb

Overview

A refers to relation. Stores the foreign key in the object. – TODO: No need to save user (should only call save aspects, for example sweepers)

THINK: Investigate if we should only store the key in the foreign object. ++

Direct Known Subclasses

BelongsTo, HasOne

Instance Attribute Summary

Attributes inherited from Relation

#options

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Relation

#[], #[]=, enchant, #initialize, #method_missing, #polymorphic?, #polymorphic_marker?, resolve, resolve_names, #resolve_polymorphic, resolve_polymorphic_markers, resolve_polymorphic_relations, resolve_targets, symbol_to_class, #to_s

Constructor Details

This class inherits a constructor from Og::Relation

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Og::Relation

Class Method Details

.foreign_key(rel) ⇒ Object 



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# File 'lib/og/relation/refers_to.rb', line 16

def self.foreign_key(rel)
  "#{rel[:foreign_name] || rel[:target_singular_name]}_#{rel[:target_class].primary_key}"
end

Instance Method Details

#enchant ⇒ Object 



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# File 'lib/og/relation/refers_to.rb', line 20

def enchant
  raise "#{target_singular_name} in #{owner_class} refers to an undefined class" if target_class.nil?
  
  self[:foreign_key] = "#{foreign_name || target_singular_name}_#{target_class.primary_key}"

  if self[:field]
    field = ", :field => :#{self[:field]}"
  end 

  target_primary_key_class = target_class.ann(target_class.primary_key).class
  
  join_table_info = owner_class.ogmanager.store.join_table_info(self)
  owner_key = join_table_info[:owner_key]
  
  owner_class.module_eval %{
    attr_accessor :#{target_singular_name}
    attr_accessor :#{foreign_key}, #{target_primary_key_class}#{field}, :relation => true

    def #{target_singular_name}(reload = false)
      return nil if @#{foreign_key}.nil? 

      # will reload if forced or first load or
      if reload or not @#{target_singular_name}
        @#{target_singular_name} = #{target_class}[@#{foreign_key}]
      end
      @#{target_singular_name}
    end

    def #{target_singular_name}=(obj)
      if obj
        @#{foreign_key} = obj.#{target_class.primary_key}
        obj.#{owner_key} = pk if obj.respond_to?(:#{owner_key}=)
        # obj.save
        save unless self.unsaved?
      end
      return obj
    end
  }    
end