1 ActionView::Template::Error: Missing host to link to! Please provide :host parameter or set default_url_options[:host] 解决:config.action_mailer.default_url_options = { :host => 'mywebsitename.com' } 2 routing: 实例:it "routes to #release" do # post("/admin/pickcontents/1/release").should route_to("admin/pickcontents#release", :id => 1) post("/admin/pickcontents/1/release").should route_to( :action => "release",:controller => "admin/pickcontents", :id => "1") end 错误信息:The recognized options <{"action"=>"release", "controller"=>"admin/pickcontents", "id"=>"1"}> did not match <{"id"=>1, "controller"=>"admin/pickcontents", "action"=>"release"}>, difference: <{"id"=>1}> 路由配置: resources :pickcontents do memeber do post "release" end end 解析:当使用注释处报错,因为项的不匹配,要是使用member匹配的路由要单独制定controller或者anction