Ruby on Rails - 模型的前 5 个：形式参数不能是常量
我在尝试将教程模型的前 5 个显示在索引页上时遇到一些问题。 我的教程控制器中的索引方法（用于索引操作）中有以下内容：
@TopTutorials = Tutorial.find(:all, :order => "views DESC", :limit => 5)
然后我使用此实例变量并尝试在索引视图中循环遍历前 5 个：
<% @TopTutorials.each do |TopViewedTutorial| %>
<%= link_to TopViewedTutorial.name, show_tutorial_path(TopViewedTutorial.category_id, TopViewedTutorial.to_param) %>
<% end %>
我对循环遍历事物有点陌生像这样，所以我认为我做错了什么。加载索引页时，我在“.each do”行收到以下错误：
formal argument cannot be a constant
有人能帮我解决这个问题吗？
最好的问候，
乔
I'm having some issues trying to get the top 5 of my tutorial model to display on my index page.
I've got the following in the index method (for the index action) in my tutorial controller:
@TopTutorials = Tutorial.find(:all, :order => "views DESC", :limit => 5)
I then use this instance variable and try to loop through the top 5 in my index view:
<% @TopTutorials.each do |TopViewedTutorial| %>
<%= link_to TopViewedTutorial.name, show_tutorial_path(TopViewedTutorial.category_id, TopViewedTutorial.to_param) %>
<% end %>
I'm kind of new to looping through things like this and so I assume I've done something wrong. On loading up the index page I get the following error at the ".each do" line:
formal argument cannot be a constant
Could anyone help me out with this?
Best Regards,
Joe
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您必须将 TopViewedTutorial 更改为以小写字母开头的内容，例如 topViewedTutorials。您可以在此处阅读有关 ruby 名称的更多信息 http://rubylearning.com/satishtalim/ruby_names.html 。
You have to change TopViewedTutorial to something starting with lowercase letter like topViewedTutorials. You could read more about ruby names here http://rubylearning.com/satishtalim/ruby_names.html.