ruby - Rails 4: ActiveRecord method '_was' for tagging attibutes -

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i'm new rails , found attribute'_was' method convenient track model's attribute before changed.

but when want find before value of tagging attribute, '_was' method not work.

for exemple :

i got 3 models article, articletag, articletagging.

an article has_many article_tags through article_tagging.

i can't use article.article_tags_was article.name_was.

dose rails has method before value of tagging attribute?

article_tags association. _was works on model attributes. may check whether 1 of associated articletag objects changed with

article.article_tags.any? { |tag| tag.changed? }

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