[英]Database value is [“”, “5”, “1”, “2”, “8”, “6”, “9”] in Rails Console is showing as “[\”\“, \”5\“, \”1\“, \”2\“, \”8\“, \”6\“, \”9\“]”?
数据库值为
["", "5", "1", "2", "8", "6", "9"]
但是在Rails控制台中,它显示为:
"[\"\", \"5\", \"1\", \"2\", \"8\", \"6\", \"9\"]"
任何解决方案,以显示它与数组相同?
看起来您的列已另存为json
[15] pry(main)> JSON.parse("[\"\", \"5\", \"1\", \"2\", \"8\", \"6\", \"9\"]")
=> ["", "5", "1", "2", "8", "6", "9"]
您可以使用serialize :name_of_that_column, Array
以便从数据库调用时对其进行解析
您可以检查http://api.rubyonrails.org/classes/ActiveRecord/AttributeMethods/Serialization/ClassMethods.html f
如果要从字符串中获取整数数组,请使用scan
和正则表达式。
例如,
pry(main)> str = "[\"\", \"5\", \"1\", \"2\", \"8\", \"6\", \"9\"]"
=> "[\"\", \"5\", \"1\", \"2\", \"8\", \"6\", \"9\"]"
pry(main)> str.scan(/\d+/)
=> ["5", "1", "2", "8", "6", "9"]
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