我的问题与前一个问题有些相似，但就我而言，我更像是一个初学者，而且我的服务器在Ruby-on-Rails 入门指南的第一页上出现故障。
基本上，该指南将引导我创建一个带有评论表单的简单博客文章应用程序。按照指南，我可以创建博客文章，并呈现评论表单。评论“显示”区域甚至呈现，它显示正确数量的评论，但存储在数据库中的值对于“评论者”和“正文”字段都是“nil”。
我直接从指南中复制了代码，因此发布它可能不会增加任何价值。这是我development.log为有趣的事件添加的空间，因此您可以看到我所看到的：
Started POST "/posts/1/comments" for 127.0.0.1 at 2012-12-17 06:50:32 -0600
Processing by CommentsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>
"YuuqmOYgsUHoHTYKBDjeE+zkYSAfWbsB4LcUz6btUkU=",
"comment"=>{"commenter"=>"just me", "body"=>"Yes"},
"commit"=>"Create Comment", "post_id"=>"1"}
[1m[35mPost Load (0.1ms)[0m SELECT "posts".* FROM "posts" WHERE "posts"."id" = ? LIMIT 1 [["id", "1"]]
[1m[36m (0.0ms)[0m [1mbegin transaction[0m
[1m[35mSQL (0.5ms)[0m INSERT INTO "comments" ("body", "commenter", "created_at",
"post_id", "updated_at") VALUES (?, ?, ?, ?, ?)
[["body", nil], ["commenter", nil],
["created_at", Mon, 17 Dec 2012 12:50:32 UTC +00:00], ["post_id", 1],
["updated_at", Mon, 17 Dec 2012 12:50:32 UTC +00:00]]
[1m[36m (5.8ms)[0m [1mcommit transaction[0m
Redirected to http://localhost:3000/posts/1
Completed 302 Found in 26ms (ActiveRecord: 7.0ms)
更新
这是comment模型：
class Comment < ActiveRecord::Base
belongs_to :post
attr_accessible :body, :commenter
attr_accessor :body, :commenter
end
和post控制器：
class PostsController < ApplicationController
# GET /posts
# GET /posts.json
def index
@posts = Post.all
respond_to do |format|
format.html # index.html.erb
format.json { render json: @posts }
end
end
# GET /posts/1
# GET /posts/1.json
def show
begin
@post = Post.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.json { render json: @post }
end
rescue ActiveRecord::RecordNotFound
redirect_to posts_path
end
end
# GET /posts/new
# GET /posts/new.json
def new
@post = Post.new
respond_to do |format|
format.html # new.html.erb
format.json { render json: @post }
end
end
# GET /posts/1/edit
def edit
@post = Post.find(params[:id])
end
# POST /posts
# POST /posts.json
def create
@post = Post.new(params[:post])
respond_to do |format|
if @post.save
format.html { redirect_to @post, notice: 'Post was successfully created.' }
format.json { render json: @post, status: :created, location: @post }
else
format.html { render action: "new" }
format.json { render json: @post.errors, status: :unprocessable_entity }
end
end
end
# PUT /posts/1
# PUT /posts/1.json
def update
@post = Post.find(params[:id])
respond_to do |format|
if @post.update_attributes(params[:post])
format.html { redirect_to @post, notice: 'Post was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: @post.errors, status: :unprocessable_entity }
end
end
end
# DELETE /posts/1
# DELETE /posts/1.json
def destroy
@post = Post.find(params[:id])
@post.destroy
respond_to do |format|
format.html { redirect_to posts_url }
format.json { head :no_content }
end
end
end
最后是.erb：
<p id="notice"><%= notice %></p>
<p>
<b>Name:</b>
<%= @post.name %>
</p>
<p>
<b>Title:</b>
<%= @post.title %>
</p>
<p>
<b>Content:</b>
<%= @post.content %>
</p>
<h2>Comments</h2>
<% @post.comments.each do |comment| %>
<p>
<b>Commenter:</b>
<%= comment.commenter %>
</p>
<p>
<b>Comment:</b>
<%= comment.body %>
</p>
<% end %>
<h2>Add a comment:</h2>
<%= form_for([@post, @post.comments.build]) do |f| %>
<div class="field">
<%= f.label :commenter %><br />
<%= f.text_field :commenter %>
</div>
<div class="field">
<%= f.label :body %><br />
<%= f.text_area :body %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
<%= link_to 'Edit', edit_post_path(@post) %> |
<%= link_to 'Back', posts_path %>
一定有一些明显的东西我在这里失踪了。