Question

我正在使用rails教程并遇到错误。

$ bundle exec rspec spec

Failure/Error: expect { click_link "delete" }.should change(Micropost, :count).by(-1)
   NoMethodError:
   undefined method `destroy' for nil:NilClass

有两个错误，由nil的未定义方法'destory'的同一问题引起：NilClass

Micropost控制器

class MicropostsController < ApplicationController
before_filter   :signed_in_user,    only: [:create, :destory]
before_filter   :correct_user,      only: :destory
def create
    @micropost = current_user.microposts.build(params[:micropost]) 
    if @micropost.save
        flash[:success] = "Micropost created!"
        redirect_to root_path
    else
        @feed_items = []
        render 'static_pages/home'
    end
end
def destroy
    @micropost.destroy
    redirect_to root_path
end
private
    def correct_user
        @micropost = current_user.microposts.find_by_id(params[:id])
        redirect_to root_path if @micropost.nil?
    end
end

我认为这是帮助我弄清楚这个问题所需的所有信息。不管怎样，还有一些。

相关问题：Rails request spec not working - noMethodError

我尝试了他们的解决方案，但没有任何区别。

_feed_item.html.erb

<li id="<%= feed_item.id %>">
<%= link_to gravatar_for(feed_item.user), feed_item.user %>
<span class="user">
    <%= link_to feed_item.user.name, feed_item.user %> 
</span>
<span class="content"><%= feed_item.content %></span> 
<span class="timestamp">
    Posted <%= time_ago_in_words(feed_item.created_at) %> ago. 
</span>
<% if current_user?(feed_item.user) %>
<%= link_to "delete", feed_item, method: :delete,
    confirm: "You sure?",
    title:   feed_item.content %>
<% end %>
</li>

由于

Answer 1

你有一个错字：

before_filter :correct_user, only: :destory

:destory应为:destroy，这会导致@micropost为零。你在另一个before_filter btw。

中犯了同样的拼写错误

undefined方法destroy for nil：NilClass - 在Rails教程中

1 个答案: