Re: Template Method Pattern (GoF) without abstract methods in Ruby

I personally do add "abstract" methods that raise errors. It makes things
more explicit than having being thrown NoMethodError in case I forget to
implement it and makes it simple to identify which methods I need to
implement/override in subclasses.

I haven't seen your code but assuming the data structures representing the
report are traversed the same for all formats you have two options:

1. Use the template method pattern as you said.
2. Make a ReportGenerator class that accepts ReportRenderer as an argument.

It's difficult to say more without seeing the code though.

Greg


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