Module: LooseTightDictionary::CachedResult::ActiveRecordBaseExtension

Defined in:
lib/loose_tight_dictionary/cached_result.rb

Instance Method Summary collapse

Instance Method Details

#cache_loose_tight_dictionary_matches_with(other_active_record_class, options) ⇒ Object

required options: :primary_key - what to call on this class :foreign_key - what to call on the other class



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# File 'lib/loose_tight_dictionary/cached_result.rb', line 27

def cache_loose_tight_dictionary_matches_with(other_active_record_class, options)
  other = other_active_record_class.to_s.singularize.camelcase
  me = name
  if me < other
    a = me
    b = other
    primary_key = :a
    foreign_key = :b
  else
    a = other
    b = me
    primary_key = :b
    foreign_key = :a
  end

  # def aircraft
  define_method other.underscore.pluralize do
    other.constantize.where options[:foreign_key] => send("#{other.underscore.pluralize}_foreign_keys")
  end
  
  # def flight_segments_foreign_keys
  define_method "#{other.underscore.pluralize}_foreign_keys" do
    fz = ::LooseTightDictionary::CachedResult.arel_table
    sql = fz.project(fz[foreign_key]).where(fz["#{primary_key}_class".to_sym].eq(self.class.name).and(fz["#{foreign_key}_class".to_sym].eq(other)).and(fz[primary_key].eq(send(options[:primary_key])))).to_sql
    connection.select_values sql
  end
  
  # def cache_aircraft!
  define_method "cache_#{other.underscore.pluralize}!" do
    other_class = other.constantize
    primary_key_value = send options[:primary_key]
    other_class.loose_tight_dictionary.find_all(primary_key_value).each do |other_instance|
      attrs = {}
      attrs[primary_key] = primary_key_value
      attrs["#{primary_key}_class"] = self.class.name
      attrs[foreign_key] = other_instance.send options[:foreign_key]
      attrs["#{foreign_key}_class"] = other
      unless ::LooseTightDictionary::CachedResult.exists? attrs
        ::LooseTightDictionary::CachedResult.create! attrs
      end
    end
  end
end