Ruby on Rails Thursday, April 20, 2017

In the snippet below,the last line causes the error; :showdate is whitelisted, it's components appear just in the params list returned by the browser The error's at the plus sign but not sure which of them

    @showday = params["showdate(3i)"]
    showmonth_string = params["showdate(2i)"]
    @showmonth = Date::MONTHNAMES[showmonth_string.to_i]
    @showyear = params["showdate(1i)"]
    @showdate = @showmonth + " " + @showday + ", " + @showyear

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