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def counter(name)
name = name.to_s
@counters ||= {}
return unless name.present?
return @counters[name] if counters.key?(name)
return unless block_given?
relaion = yield
@counters[name.to_s] ||= relation.count if relation.respond_to? :count
# использование
= counter('product') { Product }
= counter('uniq_product') { Product.uniq }
= counter('product') - counter('uniq_product')
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