Class: ActiveRecord::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/natural_key/base.rb

Class Method Summary collapse

Class Method Details

.create_or_update_by_natural_key(options) ⇒ Object

can’t use method “create_or_update” since there is already a private method with that name in ActiveRecord::Base TODO The following method should only be made available when natural_key is called with proper attributes. (hint: use class_eval?)



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# File 'lib/natural_key/base.rb', line 18

def create_or_update_by_natural_key(options)
  options.symbolize_keys!
  #TODO options should contain all key_attributes, and their values should be non-nil
  key_options = options.reject { |k,v| !key_attributes.include?(k) }
  raise "key_options cannot be empty" if key_options.empty?
  record = find(:first, :conditions => key_options)
  if(record.nil?)
    record = create(options)
  else
    record.update_attributes!(options)
  end
  record
end

.natural_key(*key_attributes) ⇒ Object 



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# File 'lib/natural_key/base.rb', line 7

def natural_key(*key_attributes)
  # TODO validate the supplied key_attributes are subset of all attributes
  # TODO key_attributes should default to primary_key/surrogate_key (:id)
  # TODO if natural_key is composed of non-primary-key, then it should not contain primary_key
  raise "natural key attributes cannot be empty" if key_attributes.empty?
  self.key_attributes = key_attributes
end