我是ROR的初学者。我遇到了一个问题,那就是当我在一本书上测试代码时。我跟着它分阶段,但错误显示...在CaculatorController#Ruby on Rails:NoMethodError
NoMethodError计算
undefined method `[]=' for nil:NilClass
Rails.root:/家庭/ toth4321 /计算器
app/controllers/caculator_controller.rb:4:in `set_charset'
控制器
class CaculatorController < ApplicationController
before_filter:set_charset
def set_charset
@headers['Content-Type'] = 'text/html; charset=GB2312'
end
def calculate
if request.post?
arg1 = convert_float(:arg1)
arg2 = convert_float(:arg2)
op = convert_operator(:operator)
@result = op.call(arg1, arg2)
end
end
private
def convert_float(name)
Float (params[name])
end
def convert_operator(name)
case params[name]
when "+" then proc {|a,b| a+b}
when "-" then proc {|a,b| a-b}
when "*" then proc {|a,b| a*b}
when "/" then proc {|a,b| a/b}
end
end
end
V iews
<html>
<head>
<title>簡單的網頁計算器</title>
</head>
<body>
<%= form_tag(:action => :calculate) %>
<%= text_field_tag(:arg1, @params[:arg1], :size =>3) %>
<%= select_tag(:operator, options_for_select(%w{+ - * /})), @params[:operator])) %>
<%= text_field_tag(:arg2, @params[:arg2], :size =>3) %>
<%= submit_tag("送出") %>
<% end_form_tag %>
<b><%= @result %></b>
</body>
</html>
有人可以帮助我吗? 非常感谢!
它显示这个错误 '/home/toth4321/calculator/app/controllers/calculator_controller.rb:4:语法错误,意想不到的 '=',希望keyword_end @headers = ['内容类型'] ='text/html;字符集= GB2312' ' – 2013-04-10 16:13:34
不是'=',而是'=>' – Zippie 2013-04-10 16:14:29