[英]Database value is [“”, “5”, “1”, “2”, “8”, “6”, “9”] in Rails Console is showing as “[\”\“, \”5\“, \”1\“, \”2\“, \”8\“, \”6\“, \”9\“]”?
數據庫值為
["", "5", "1", "2", "8", "6", "9"]
但是在Rails控制台中,它顯示為:
"[\"\", \"5\", \"1\", \"2\", \"8\", \"6\", \"9\"]"
任何解決方案,以顯示它與數組相同?
看起來您的列已另存為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
以便從數據庫調用時對其進行解析
您可以檢查http://api.rubyonrails.org/classes/ActiveRecord/AttributeMethods/Serialization/ClassMethods.html f
如果要從字符串中獲取整數數組,請使用scan
和正則表達式。
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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