Module: Modis::Attribute::ClassMethods

Defined in:
lib/modis/attribute.rb

Instance Method Summary collapse

Instance Method Details

#attribute(name, type, options = {}) ⇒ Object

Raises:



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
 
# File 'lib/modis/attribute.rb', line 32

def attribute(name, type, options = {})
  name = name.to_s
  raise AttributeError, "Attribute with name '#{name}' has already been specified." if attributes.key?(name)

  type_classes = Array(type).map do |t|
    raise UnsupportedAttributeType, t unless TYPES.key?(t)

    TYPES[t]
  end.flatten

  attributes[name] = options.update(type: type)
  attributes_with_defaults[name] = options[:default]
  define_attribute_methods([name])

  value_coercion = type == :timestamp ? 'value = Time.new(*value) if value && value.is_a?(Array) && value.count == 7' : nil
  predicate = type_classes.map { |cls| "value.is_a?(#{cls.name})" }.join(' || ')

  type_check = "  if value && !(\#{predicate})\n    raise Modis::AttributeCoercionError, \"Received value of type '\\\#{value.class}', expected '\#{type_classes.join(\"', '\")}' for attribute '\#{name}'.\"\n  end\n  RUBY\n\n  class_eval <<-RUBY, __FILE__, __LINE__ + 1\n    def \#{name}\n      attributes['\#{name}']\n    end\n\n    def \#{name}=(value)\n      \#{value_coercion}\n\n      # ActiveSupport's Time#<=> does not perform well when comparing with NilClass.\n      if (value.nil? ^ attributes['\#{name}'].nil?) || (value != attributes['\#{name}'])\n        \#{type_check}\n        \#{name}_will_change!\n        attributes['\#{name}'] = value\n      end\n    end\n  RUBY\nend\n"

#bootstrap_attributes(parent = nil) ⇒ Object 



21
22
23
24
25
26
27
28
29
30
 
# File 'lib/modis/attribute.rb', line 21

def bootstrap_attributes(parent = nil)
  class << self
    attr_accessor :attributes, :attributes_with_defaults
  end

  self.attributes = parent ? parent.attributes.dup : {}
  self.attributes_with_defaults = parent ? parent.attributes_with_defaults.dup : {}

  attribute :id, :integer unless parent
end