Ruby on rails 一个被击中的常数赢了'；我不允许创建日历

我正在尝试创建一个日历，并且一直在YouTube

calendar ruby on rails

first video上学习教程。一旦我输入了密码，我就出错了

未初始化的常量CalenderHelper:：Stroked

代码是

module CalenderHelper
def calender(date = Date.today, &block)
    Calender.new(self, date, block).table
end

**class Calender < Struck.new(:view, :date, :callback)**
    HEADER = %w[Sunday Monday Tuesday Wednesday Thursday Friday Saturday]
    START_DAY = :sunday 

    delegate :content_tag, to: :view

def table
    content_tag :table, class: "calender" do
        header + week_rows
    end
end

def header
    content_tag :tr do
    HEADER.map { |day| content_tag :th, day }.join.html_safe
    end
end

def week_rows
    week.map do |week|
        content_tag :tr do
            week.map { |day| day_cell(day) }.join.html_safe
        end
    end.join.html_safe
end

def day_cell(day)
    content_tag :td, view.capture(day, &callback), class: day_classes(day)
end

def day_classes(day)
    classes = []
    classes << "today" if day == Date.today
    classes << "notmonth" if day.month != date.month
    classes.empty? ? nil : classes.join(" ")
end

def weeks 
    first = date.beginning_of_month.beginning_of_week(START_DAY)
    last = date.end_of_month.end_of_week(START_DAY)
    (first..last).to_a.in_groups_of(7)
    end
end
end 

模块压延辅助工具
def日历（日期=date.today和block）
日历。新的（自我，日期，块）。表
结束
**类日历类您有一个小的拼写错误：

你想给班级打电话，而不是打电话

您的线路应该是：

classcalendar

希望有帮助