我的 Ruby on Rails 应用程序遇到了一些问题。我是新手,所以我想问题并不太复杂
基本上我正在尝试创建一个讨论板。/discussions 页面有许多由用户创建的讨论,这些用户可以发布微博对其进行评论。但是,当我单击微发布表单的发布按钮时,我收到一条错误消息
微博中的 NoMethodError#create
显示 /home/nick/Documents/RailsProjects/buon/app/views/shared/_discussion_form.html.erb 其中第 1 行提出:
NilClass:Class 的未定义方法“model_name”
有任何想法吗?这是一些代码
微博.rb
class Micropost < ActiveRecord::Base
attr_accessible :break_votes, :content, :not_votes
belongs_to :user
belongs_to :discussion
validates :content, presence: true, length: { maximum: 200 }
validates :user_id, presence: true
validates :discussion_id, presence: true
default_scope order: 'microposts.created_at DESC'
结尾
_discussions.html.erb
<% content_for :script do %>
<%= javascript_include_tag 'hover_content' %>
<% end %>
<li>
<div class = "intro-bar"><span class = "intro"><%=discussion.intro %></span></div>
<div class = "content-bar">
<span class = "content"><%= discussion.content %>
<div class = "vote-plus"><%= link_to "Stay Together", signup_path,class: "btn btn-large btn-primary" %></div>
<div class = "vote-neg"><%= link_to "Break Up", signup_path,class: "btn btn-large btn-primary" %></div>
</span>
</div>
<span class = "timestamp">
Posted <%= time_ago_in_words(discussion.created_at) %> ago.
</span>
</li>
<div class = "comments">
<% discussion.microposts.each do |micropost| %>
<li>
<div class = "post-comment"><%= micropost.content%></div>
</li>
<% end %>
</div>
<% if signed_in? %>
<div class = "row">
<aside class = "span4">
<section>
<%= render 'shared/micropost_form', :locals => {:discussion => discussion }%>
</section>
</aside>
</div>
<% end %>
微柱控制器
class MicropostsController < ApplicationController
before_filter :signed_in_user, only: [:create, :destroy]
def index
end
def create
@micropost = current_user.microposts.build(params[:micropost])
if @micropost.save
flash[:success] = "Posted!"
redirect_to root_url
else
render 'static_pages/home'
end
end
def destroy
end
end
讨论控制器
class DiscussionsController < ApplicationController
before_filter :signed_in_user, only: [:index, :edit, :update]
def show
@user = User.find(params[:id])
@discussions = @user.discussion.paginate(page: params[:page])
@microposts = @user.micropost.paginate(page: params[:page])
end
def index
@discussions = Discussion.all
end
def create
@discussion = current_user.discussions.build(params[:discussion])
if @discussion.save
flash[:success] = "Discussion Started!"
redirect_to root_url
else
render 'static_pages/home'
end
end
def destroy
end
def edit
end
def update
end
def new
end
结尾
更新:micropost_form
<% @micropost = Micropost.new %>
<% @micropost.discussion = nil %>
<%= form_for(@micropost) do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<div class="field">
<%= f.text_area :content, placeholder: "Compose new micropost..." %>
</div>
<%= f.submit "Post", class: "btn btn-large btn-primary" %>
<% end %>