Module: YiffSpace::Concerns::HasBitFlags::ClassMethods

Defined in:
lib/yiffspace/concerns/has_bit_flags.rb

Instance Method Summary collapse

Instance Method Details

#has_bit_flags(attributes, options = {}) ⇒ Object

NOTE: the ordering of attributes has to be fixed new attributes should be appended to the end.



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# File 'lib/yiffspace/concerns/has_bit_flags.rb', line 11

def has_bit_flags(attributes, options = {})
  field = options[:field] || :bit_flags

  define_singleton_method("flag_value_for") do |key|
    value = attributes[key.to_s]
    return value if value

    raise(ArgumentError, "Invalid flag: #{key}")
  end

  attributes.each do |name, value|
    scope(name.to_sym, -> { where.has_bits(field => value) })
    define_method(name) do
      send(field) & value == value
    end

    define_method("#{name}=") do |val|
      if val.to_s =~ /[t1y]/
        send("#{field}=", send(field) | value)
      else
        send("#{field}=", send(field) & ~value)
      end
    end

    define_method("#{name}_was") do
      send("#{field}_was") & value == value
    end

    define_method("#{name}_before_last_save") do
      send("#{field}_before_last_save") & value == value
    end

    alias_method("#{name}?", name)
    alias_method("#{name}_before_last_save?", "#{name}_before_last_save")
    alias_method("#{name}_was?", "#{name}_was")

    define_method("#{name}_changed?") do
      send("#{name}_was") != send(name)
    end

    define_method("saved_change_to_#{name}?") do
      send("#{name}_before_last_save") != send(name)
    end
  end
end