If you come across classifieds websites like craigslist, oodle, kijiji,... everything is a classified, when you are posting a classified, they show different form fields depending upon the category one selects. For example, if you are posting a classified about Car, they show make, model, interiors, etc... How do you think data is handled in the database?If you come across classifieds websites like cr
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Rails：如何处理数据库中的动态属性？
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