Module: Valuable::Utils

Defined in:
lib/valuable/utils.rb

Class Method Summary collapse

Class Method Details

.can_be_duplicated?(item) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/valuable/utils.rb', line 121

def can_be_duplicated?( item )
  Marshal.dump(item)
  true
rescue
  false
end

.check_options_validity(class_name, attribute, options) ⇒ Object

this helper raises an exception if the options passed to has_value are wrong. Mostly written because I occasionally used :class instead of :klass and, being a moron, wasted time trying to find the issue.

Raises:

  • (ArgumentError) 


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# File 'lib/valuable/utils.rb', line 131

def check_options_validity( class_name, attribute, options )
  invalid_options = options.keys - known_options

  raise ArgumentError, "#{class_name}##{attribute} has a default value that must be set using a lambda. Use :default => lambda { Thing.new }." if options[:default] && !options[:default].kind_of?(Proc) && !can_be_duplicated?( options[:default] )

  raise ArgumentError, "has_value did not know how to respond to option(s) #{invalid_options.join(', ')}. Valid (optional) arguments are: #{known_options.join(', ')}" unless invalid_options.empty?

  raise ArgumentError, "#{class_name} doesn't know how to format #{attribute} with :klass => #{options[:klass].inspect}" unless klass_options.any?{|klass| klass === options[:klass]}

  raise( ArgumentError, "#{class_name} can't promise to return a(n) #{options[:klass]} when using :parse_with" ) if options[:klass].is_a?( Symbol ) && options[:parse_with]
end

.deep_duplicate_of(value) ⇒ Object 



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# File 'lib/valuable/utils.rb', line 33

def deep_duplicate_of(value)
  Marshal.load(Marshal.dump(value))
end

.find_attribute_for(name, attributes) ⇒ Object 



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# File 'lib/valuable/utils.rb', line 9

def find_attribute_for( name, attributes )
  name = name.to_sym

  if attributes.keys.include?( name )
    name
  elsif found=attributes.find{|n, v| v[:alias].to_sym == name }
    found[0]
  end
end

.format(name, value, attributes, collection_item = false) ⇒ Object 



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# File 'lib/valuable/utils.rb', line 37

def format( name, value, attributes, collection_item = false )
  klass = collection_item ? attributes[name][:item_klass] : attributes[name][:klass]

  case klass
  when *formatters.keys
    formatters[klass].call(value)

  when NilClass

    if Proc === attributes[name][:parse_with]
      attributes[name][:parse_with].call(value)
    else
      value
    end

  when :collection
    value.map do |item|
      Valuable::Utils.format( name, item, attributes, true )
    end

  when :date

    case value.class.to_s
    when "Date"
      value
    when "ActiveSupport::TimeWithZone", "Time", "DateTime"
      value.to_date
    when "String"
      value && begin; Date.parse(value); rescue; end
    else
      value
    end

  when :integer

    value.to_i if value && value != ''

  when :decimal

    case value
    when NilClass
      nil
    when BigDecimal
      value
    else
      BigDecimal.new( value.to_s )
    end

  when :string

    value && value.to_s

  when :boolean

    value == '0' ? false : !!value

  else

    if value.nil?
      nil
    elsif value.is_a? klass
      value
    elsif Proc === attributes[name][:parse_with]
      attributes[name][:parse_with].call(value)
    else
      klass.send( attributes[name][:parse_with] || :new, value)
    end

  end unless value.nil?

end

.formatters ⇒ Object 



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# File 'lib/valuable/utils.rb', line 109

def formatters
  @formatters ||= {}
end

.initial_copy_of_attributes(atts) ⇒ Object 



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# File 'lib/valuable/utils.rb', line 19

def initial_copy_of_attributes(atts)
  out = {}
  atts.each do |name, value|
    case value
    when Proc
      out[name] = value.call
    else
      out[name] = deep_duplicate_of( value )
    end
  end

  out
end

.klass_options ⇒ Object 



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# File 'lib/valuable/utils.rb', line 113

def klass_options
  [NilClass, :integer, Class, :date, :decimal, :string, :boolean] + formatters.keys
end

.known_options ⇒ Object 



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# File 'lib/valuable/utils.rb', line 117

def known_options
  [:klass, :default, :negative, :alias, :parse_with, :extend, :allow_blank]
end