Module: ArLookups::ActiveRecordExt

Defined in:
lib/ar_lookups/activerecord_ext.rb

Instance Method Summary collapse

Instance Method Details

#ar_lookups ⇒ Object 



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# File 'lib/ar_lookups/activerecord_ext.rb', line 3

def ar_lookups
  @ar_lookups ||= superclass.respond_to?(:ar_lookups) ? superclass.ar_lookups.dup : {}
end

#lookup(column, *args) ⇒ Object 



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# File 'lib/ar_lookups/activerecord_ext.rb', line 7

def lookup(column, *args)
  options = args.extract_options!
  lookup_model = args.first

  options.reverse_merge!(key_column: :key, name_column: :name)

  # Directly override accessors and super to the module below
  class_eval <<-RUBY, __FILE__, __LINE__ + 1
    def #{column}; super; end
    def #{column}=(value); super; end
  RUBY

  ar_lookups[column] = lookup_model || implicit_lookup_class(column)

  # Mixin this Module so that we can use super in these functions
  mod = Module.new
  include mod
  mod.class_eval <<-RUBY, __FILE__, __LINE__ + 1
    def #{column}
      keys = read_attribute(:#{column})
      klass = self.class.ar_lookups[:#{column}]
      return klass.none if keys.blank?
      self.class.ar_lookups[:#{column}].where('#{options[:key_column]} IN (?)', keys)#.pluck(:#{options[:key_column]}, :#{options[:name_column]})]
    end

    def #{column}_ids
      read_attribute(:#{column})
    end

    def #{column}=(val)
      write_attribute(:#{column}, val)
    end
  RUBY
end