How to check if instance variable value have changed?
For global variable there is a trace_var method http://apidock.com/ruby/Kernel/trace_var
But I didn't found any information how to do that with instance variables(or class one).
I didn't use Rails.
Ruby 1.9.2.
The best approach might be to avoid accessing and manipulating the instance variable directly and instead go through an attr_accessor style interface.
This gives you the ability to do things like this:
def my_attr=(value)
logger.debug("my_attr changed to #{value.inspect}")
@my_attr = value
end
