关于ruby：Rails路由错误问题

Rails Routing Error Issue

我是新的Rails开发人员，正在创建一个应用程序，该应用程序会产生以下问题：

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Routing Error

No route matches {:action=>"show", :controller=>"recipes", :username=>#<Recipe id: 42, name:"Curried Chicken Sandwich", yield:"4 Servings", description:"Burgers aren't the only grilled things we want to e...", created_at:"2013-06-27 18:49:42", updated_at:"2013-06-27 18:49:42", duration:"", author: nil, url: nil, user: 3, image:"curried-chicken-sandwich-646.jpg", user_recipe_id: nil>}

我的routes.rb看起来像这样：

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match"/:username" =>"recipes#index"
scope ':username' do
resources :recipes
end

我的控制器索引如下：

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def index
if params[:tag]
@recipes = Recipe.tagged_with(params[:tag]).where(:user => current_user.id).paginate(:page => params[:page], :per_page => 45)
else
@user = User.find_by_username params[:username]
@search = Recipe.search do |query|
query.fulltext params[:search]
query.with(:user, @user.id)
query.paginate(:page => params[:page] || 1, :per_page => 20)
end
@recipes = @search.results
respond_to do |format|
format.html # index.html.erb
format.json { render json: @recipes }
end
end
end

我的控制器显示如下：

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def show
@user = User.find_by_username params[:username]
@recipe = Recipe.where(:user_recipe_id => params[:id])

respond_to do |format|
format.html # show.html.erb
format.json { render json: @recipe }
end
end

我的索引视图：

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<% if not @recipes.any? %>
No Recipes
<% else%>

<% @recipes.each do |recipe| %>

<%= link_to recipe.name, recipe %>
<% end %>

为什么会这样？显示动作在那里，但是在错误中指出它没有。

感谢所有帮助