undefined method `model_name' for NilClass:Class
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<%= simple_form_for @user, :url => {:action => :action_name} do |f| %><% end %>页面加载以上代码报错如下：
undefined method `model_name' for NilClass:Class
原因是因为@user为空，改代码如下
<%= simple_form_for @user.blank? ? User.new : @user, :url => {:action => :action_name} do |f| %><% end %>笔记
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