Module: Degu::HasSet::ClassMethods
- Defined in:
- lib/degu/has_set.rb
Instance Method Summary collapse
-
#has_set(set_name, options = {}) ⇒ Object
Use like this:.
Instance Method Details
#has_set(set_name, options = {}) ⇒ Object
Use like this:
class Person < ActiveRecord::Base
has_set :interests
end
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 |
# File 'lib/degu/has_set.rb', line 16 def has_set(set_name, = {}) set_name_singular = set_name.to_s.singularize set_column = .has_key?(:column_name) ? [:column_name].to_s : "#{set_name}_bitfield" begin enum_class = [:class_name] || [:enum_class] || set_name.to_s.camelcase.constantize rescue NameError => ne raise NameError, "There ist no class to take the set entries from (#{ne.})." end define_method("#{set_name}=") do |argument_value| value = nil unless argument_value.nil? value = 0 has_set_coerce_argument_value(enum_class, argument_value).each do |set_element| value |= 1 << set_element.bitfield_index end end write_set_attribute set_column, value end define_method(set_name) do value = read_set_attribute(set_column) or return set_elements = enum_class.select do |enum_element| mask = 1 << enum_element.bitfield_index value & mask == mask end # special to_s method for element-array class << set_elements def to_s map(&:name) * ', ' end end set_elements end class << self; self; end.instance_eval do define_method("available_#{set_name}") do enum_class.underscored_names.map { |name| "#{set_name_singular}_#{name}" } end end define_method("available_#{set_name}") do enum_class.underscored_names.map { |name| "#{set_name_singular}_#{name}" } end enum_class.each do |enum| define_method("#{set_name_singular}_#{enum.underscored_name}?") do mask = 1 << enum.bitfield_index read_set_attribute(set_column) & mask == mask end alias_method :"#{set_name_singular}_#{enum.underscored_name}", :"#{set_name_singular}_#{enum.underscored_name}?" define_method("#{set_name_singular}_#{enum.underscored_name}=") do |true_or_false| mask = 1 << enum.bitfield_index total_value = read_set_attribute(set_column) current_value = mask & total_value == mask true_or_false = true if true_or_false.to_s == "true" || true_or_false.respond_to?(:to_i) && true_or_false.to_i == 1 true_or_false = false if true_or_false.to_s == "false" || true_or_false.respond_to?(:to_i) && true_or_false.to_i == 0 if current_value != true_or_false write_set_attribute set_column, true_or_false ? total_value | mask : total_value & ~mask end end end end |