我有一个在本地运行 SQLite 的 Rails 4 应用程序和在 Heroku 上运行 PostgreSQL 的 Rails 4 应用程序。
我的 PostController 的索引操作遇到问题。我收到上述错误,但仅限于 Heroku。
我已经仔细检查了所有代码并运行了所有迁移并重新启动了 Heroku 服务器。我还仔细检查了本地和 Heroku 上的迁移是否相同。该问题似乎与通过 Post 模型访问 User 模型中的数据特别相关。例如,我尝试通过 Heroku 上的 Rails 控制台访问其他属性,例如电子邮件,但我得到了相同的未定义方法错误。所以我很确定这与表连接有关。
另外要澄清的是,我在生产数据库中确实有数据
这是我的 PostsController 操作:
class PostsController < ApplicationController
before_filter :authenticate_user!, except: [:index, :show]
before_action :set_post, only: [:show, :edit, :update, :destroy]
# GET /posts
# GET /posts.json
def index
@posts = Post.all
end
end
我的帖子模型:
class Post < ActiveRecord::Base
belongs_to :user
end
我在用户模型中的代码:
class User < ActiveRecord::Base
rolify
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable, :confirmable
belongs_to :qualification
has_many :posts
validates :phone, presence: true, format: { with: /\d{3}.\d{3}.\d{4}/, message: "Must be in 555.555.5555 format" }
validates :name, presence: true
validates :email, presence: true
validates :acknowledgement, presence: true
# new function to set the password without knowing the current password used in our confirmation controller.
def attempt_set_password(params)
p = {}
p[:password] = params[:password]
p[:password_confirmation] = params[:password_confirmation]
update_attributes(p)
end
# new function to return whether a password has been set
def has_no_password?
self.encrypted_password.blank?
end
# new function to provide access to protected method unless_confirmed
def only_if_unconfirmed
pending_any_confirmation {yield}
end
def password_required?
# Password is required if it is being set, but not for new records
if !persisted?
false
else
!password.nil? || !password_confirmation.nil?
end
end
end
我的index.html.erb 文件:
<% @posts.each do |post| %>
<h2 class='subheader'><%= link_to post.title, post %></h2>
<h6>written by <%= post.user.name %> on <%= post.created_at.to_s(:long) %></h6>
<div><%= post.body.html_safe %></div>
<% if user_signed_in? %>
<% if current_user.has_role? :admin %>
<div><%= link_to 'Edit', edit_post_path(post) %></div>
<div><%= link_to 'Destroy', post, method: :delete, data: { confirm: 'Are you sure?' } %> </div>
<% end %>
<% end %>
<% end %>
<br>
<%= link_to 'New Post', new_post_path %>
我的 Heroku 日志的输出:
2013-12-19T06:31:13.280899+00:00 app[web.1]: Started GET "/posts" for 64.114.175.126 at 2013-12-19 06:31:13 +0000
2013-12-19T06:31:13.280899+00:00 app[web.1]: Started GET "/posts" for 64.114.175.126 at 2013-12-19 06:31:13 +0000
2013-12-19T06:31:13.283663+00:00 app[web.1]: Processing by PostsController#index as HTML
2013-12-19T06:31:13.283663+00:00 app[web.1]: Processing by PostsController#index as HTML
2013-12-19T06:31:13.292344+00:00 app[web.1]: Rendered posts/index.html.erb within layouts/application (6.9ms)
2013-12-19T06:31:13.292553+00:00 app[web.1]: Completed 500 Internal Server Error in 9ms
2013-12-19T06:31:13.292344+00:00 app[web.1]: Rendered posts/index.html.erb within layouts/application (6.9ms)
2013-12-19T06:31:13.292553+00:00 app[web.1]: Completed 500 Internal Server Error in 9ms
2013-12-19T06:31:13.295581+00:00 app[web.1]:
2013-12-19T06:31:13.295581+00:00 app[web.1]: 6: <div><%= post.body.html_safe %></div>
2013-12-19T06:31:13.295581+00:00 app[web.1]: 3: <% @posts.each do |post| %>
2013-12-19T06:31:13.295581+00:00 app[web.1]: 7: <% if user_signed_in? %>
2013-12-19T06:31:13.295581+00:00 app[web.1]: 2:
2013-12-19T06:31:13.295581+00:00 app[web.1]: 4: <h2 class='subheader'><%= link_to post.title, post %></h2>
2013-12-19T06:31:13.295581+00:00 app[web.1]: ActionView::Template::Error (undefined method `name' for nil:NilClass):
2013-12-19T06:31:13.295581+00:00 app[web.1]: 5: <h6>written by <%= post.user.name %> on <%= post.created_at.to_s(:long) %></h6>
2013-12-19T06:31:13.295778+00:00 app[web.1]: app/views/posts/index.html.erb:3:in `_app_views_posts_index_html_erb__338969566965495969_70155247178440'
2013-12-19T06:31:13.295778+00:00 app[web.1]: 2:
2013-12-19T06:31:13.295778+00:00 app[web.1]:
2013-12-19T06:31:13.295778+00:00 app[web.1]: ActionView::Template::Error (undefined method `name' for nil:NilClass):
2013-12-19T06:31:13.295778+00:00 app[web.1]:
2013-12-19T06:31:13.295778+00:00 app[web.1]: 3: <% @posts.each do |post| %>
2013-12-19T06:31:13.295778+00:00 app[web.1]:
2013-12-19T06:31:13.295581+00:00 app[web.1]: 8: <% if current_user.has_role? :admin %>
2013-12-19T06:31:13.295581+00:00 app[web.1]: app/views/posts/index.html.erb:5:in `block in _app_views_posts_index_html_erb__338969566965495969_70155247178440'
2013-12-19T06:31:13.295778+00:00 app[web.1]: 5: <h6>written by <%= post.user.name %> on <%= post.created_at.to_s(:long) %></h6>
2013-12-19T06:31:13.295778+00:00 app[web.1]: 6: <div><%= post.body.html_safe %></div>
2013-12-19T06:31:13.295947+00:00 app[web.1]: 7: <% if user_signed_in? %>
2013-12-19T06:31:13.295947+00:00 app[web.1]: 8: <% if current_user.has_role? :admin %>
2013-12-19T06:31:13.295947+00:00 app[web.1]: app/views/posts/index.html.erb:5:in `block in _app_views_posts_index_html_erb__338969566965495969_70155247178440'
2013-12-19T06:31:13.295947+00:00 app[web.1]: app/views/posts/index.html.erb:3:in `_app_views_posts_index_html_erb__338969566965495969_70155247178440'
2013-12-19T06:31:13.295778+00:00 app[web.1]: 4: <h2 class='subheader'><%= link_to post.title, post %></h2>
2013-12-19T06:31:13.295947+00:00 app[web.1]:
2013-12-19T06:31:13.295947+00:00 app[web.1]:
2013-12-19T06:31:13.303637+00:00 heroku[router]: at=info method=GET path=/posts host=www.kettlecreekventure.com fwd="64.114.175.126" dyno=web.1 connect=8ms service=25ms status=500 bytes=1266
2013-12-19T06:31:14.630725+00:00 heroku[router]: at=info method=GET path=/favicon.ico host=www.kettlecreekventure.com fwd="64.114.175.126" dyno=web.1 connect=1ms service=4ms status=200 bytes=0
2013-12-19T06:31:22.445573+00:00 heroku[run.7634]: Process exited with status 0
2013-12-19T06:31:22.459444+00:00 heroku[run.7634]: State changed from up to complete
同样,代码在我的本地计算机上完美运行,但在部署到 Heroku 后失败并出现上述错误。当应用程序尝试引用 post.user.name 时,index.html.erb 文件中出现错误。我正在拔头发试图弄清楚。
如果有人能看到我的问题出在哪里,我将不胜感激。我究竟做错了什么?