Module: ModelX::Associations::ClassMethods

Defined in:
lib/model_x/associations.rb

Instance Method Summary collapse

Instance Method Details

#belongs_to(association, options = {}) ⇒ Object

Define a belongs_to association.

Parameters:

  • association (Symbol|String) —

    The name of the association.

  • options (Hash) (defaults to: {}) —

    a customizable set of options

Options Hash (options):

  • :class_name (String) —

    The class name of the associated object.

  • :foreign_key (#to_s) —

    The foreign key to use.



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# File 'lib/model_x/associations.rb', line 19

def belongs_to(association, options = {})
  class_name = options[:class_name] || association.to_s.camelize
  foreign_key = options[:foreign_key] || "#{association}_id"

  attribute foreign_key

  # Define attribute readers and writers for the ID attribute.
  class_eval "\n    def \#{foreign_key}\n      read_attribute(:\#{foreign_key}) || @\#{association}.try(:id)\n    end\n\n    def \#{foreign_key}=(value)\n      value = nil if value.blank?\n      write_attribute :\#{foreign_key}, value\n      @\#{association} = nil\n    end\n\n    def \#{association}(reload = false)\n      id = \#{foreign_key}\n      if reload\n        @\#{association} = ::\#{class_name}.find_by_id(id) if id\n      else\n        @\#{association} ||= ::\#{class_name}.find_by_id(id) if id\n      end\n    end\n\n    def \#{association}=(value)\n      value = nil if value.blank?\n      @\#{association} = value\n      write_attribute :\#{foreign_key}, nil\n    end\n\n  RUBY\n\nend\n", __FILE__, __LINE__+1

#has_many(association, options = {}) ⇒ Object

Defines a has_many association.



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# File 'lib/model_x/associations.rb', line 58

def has_many(association, options = {})
  attribute association

  class_name = options[:class_name] || association.to_s.singularize.camelize
  foreign_key = options[:foreign_key] || "#{association.to_s.singularize}_id"
  ids_attribute = foreign_key.pluralize

  attribute ids_attribute

  # Define attribute readers and writers for the ID attribute.
  class_eval "\n    def \#{ids_attribute}\n      read_attribute(:\#{ids_attribute}) || read_attribute(:\#{association}).try(:id)\n    end\n\n    def \#{ids_attribute}=(value)\n      value = nil if value.blank?\n      write_attribute :\#{ids_attribute}, value\n      @\#{association} = nil\n    end\n\n    def \#{association}(reload = false)\n      ids = \#{ids_attribute}\n      if reload\n        @\#{association} = ::\#{class_name}.where(:id => ids) if ids\n      else\n        @\#{association} ||= ::\#{class_name}.where(:id => ids) if ids\n      end\n    end\n\n    def \#{association}=(value)\n      value = nil if value.blank?\n      @\#{association} = value\n      write_attribute :\#{ids_attribute}, nil\n    end\n\n  RUBY\n\nend\n", __FILE__, __LINE__+1