Advanced Rails - Building Industrial-Strength Web Apps in Record Time

Date and Time

Date and Time | 63

The accessors are defined just as with regular class attributes:
class Parent
class_inheritable_array :log
self.log = []

def initialize

super

log << "#{self.inspect} created"

end

end

Parent.new

Parent.log # => ["#<Parent:0x10a07c4> created"]

The attributes and their values are inherited to children. This attribute inheritance only
happens at the time of class inheritance. After the child class has inherited from the parent
class, the attributes are separate and do not interact.

class Child < Parent

end

Parent.log # => ["#<Parent:0x10a07c4> created"]

Child.log # => ["#<Parent:0x10a07c4> created"]

Parent.new

Child.new

Parent.log # => ["#<Parent:0x10a07c4> created", "#<Parent:0x109fd9c> created"]

Child.log # => ["#<Parent:0x10a07c4> created", "#<Child:0x109fd88> created"]

Date and Time

Conversions core_ext/date/conversions.rb,core_ext/time/conversions.rb

• Date#to_time,Date#to_time(:utc),Date#to_date,Time#to_date,Time#to_time: These
  methods allow you to use dates and times in a roughly interchangeable way.


• Date#to_s(format)formats a date in one of several formats (Table 2-1). The:default
  format is used if no format is specified.


• Time#to_s(format) formats a date and time in one of several formats (Table 2-2). The
  :default format is used if no format is specified.

Table 2-1. Date formats

Format Example

:default 2006-12-28

:short 28 Dec

:long December 28, 2006