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原标题:acts_as_taggable_on with a collection

我有一份属于一类的产品清单。 每个产品都有标签。 见以下例子(假体代码)。

Category = transport
Products = car, train, bus

car has tags = small, fast
train has tags = fast, large
bus has tags = slow, large

我如何列出运输类别产品的所有标签? 其结果应当是[“小”、“小”、“小”]。

最佳回答

确定产品标签。 它对属于该类的产品具有吸引力。 我假定,你的关系是固定的。 如有任何重复,从<>中删除。

@tags = [] 
@category.products.each { |p| @tags << p.tags }
@tags.uniq!
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