On Thu, Feb 21, 2013 at 1:40 PM, Joel Pearson <[email protected]> wrote:
> I thought I could avoid the issue of splitting the data into multiple
> outputs by creating copies of the class, but apparently I was wrong:
>
> irb(main):002:0> m = RubyExcel.new.load [['a','b']]
> => columns: 2, rows: 1, values: 2
>
> irb(main):003:0> a = m.clone
>
> irb(main):004:0> a['A1'] = nil
>
> irb(main):005:0> puts a
> b
>
> irb(main):006:0> puts m
> b
>
> What am I doing wrong? Is @data inside m not being duplicated along with
> the class instance?
#clone and #dup are _always_ shallow copies. If you want to change
that you need to override them, e.g.
class Excel
def dup
super.tap do |copy|
%w{@table foo}.each {|iv| copy.instance_variable_set(iv,
instance_variable_get(iv).dup)}
end
end
end
Kind regards
robert
--
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http://blog.rubybestpractices.com/
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