Good way to catch exception in one method among several classes

Question

Currently I have several classes, each of which deals with different sites. They act like the same type, in the sense that they all have crawl_item() method.

class CrawlA def crawl_item ... A.create() end end class CrawlB def crawl_item B.create() end end

Now I want to catch one model validation exception when calling any of these crawl_item methods, and perform the same rescue action. What would be a good way to implement this?

I guess we can assume that the methods crawl_item are different in each class, aren't they? — tokland
– tokland, Commented Aug 1, 2012 at 12:45
@tokland yes they do crawl but the implementations are quite different — lulalala
– lulalala, Commented Aug 3, 2012 at 1:44

tokland · Accepted Answer · 2012-08-01 17:46:17Z

To keep it DRY you can write a wrapper using the classical mix-in structure (module + class include):

module CrawlValidator def with_validations begin yield rescue => exc ... end end end class CrawlA include CrawlValidator def crawl_item with_validations { A.create } end end

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