[英]Rails with Devise, works fine on localhost, fails on Heroku
[英]Works fine on localhost, but not on heroku
嘗試訪問我的帖子時,heroku出現問題。 日志說:
Rendered posts/index.html.erb within layouts/application (920.6ms)
2015-11-06T09:39:41.716328+00:00 app[web.1]: Completed 500 Internal Server Error in 936ms (ActiveRecord: 42.1ms)
2015-11-06T09:39:41.720223+00:00 app[web.1]:
2015-11-06T09:39:41.720226+00:00 app[web.1]: ActionView::Template::Error (undefined method `email' for nil:NilClass):
2015-11-06T09:39:41.720227+00:00 app[web.1]: 22: <dt> <%= post.body %> </dt>
2015-11-06T09:39:41.720227+00:00 app[web.1]: 23: <dd><%= post.tags %> </dd>
2015-11-06T09:39:41.720228+00:00 app[web.1]: 24: </dl>
2015-11-06T09:39:41.720229+00:00 app[web.1]: 25: <%= gravatar_for post.user, size: 40%> Created by <b><%= post.user.name if post.user %></b>
2015-11-06T09:39:41.720229+00:00 app[web.1]: 26: </td>
2015-11-06T09:39:41.720230+00:00 app[web.1]: 27:
2015-11-06T09:39:41.720231+00:00 app[web.1]: 28: <div>
2015-11-06T09:39:41.720231+00:00 app[web.1]: app/helpers/users_helper.rb:3:in `gravatar_for'
在localhos:3000/posts
上運行良好,該錯誤僅出現在heroku上。 我在開發和生產中都使用PostgreSQL。
這是我的routes.rb:
resources :users
resources :sessions, only: [:new, :create, :destroy]
resources :posts
root 'posts#index'
match '/signup', to: 'users#new', via: 'get'
match '/signin', to: 'sessions#new', via: 'get'
match '/signout', to: 'sessions#destroy', via: 'delete'
我的帖子的一部分#index:
<div class="show_posts">
<table>
<% @posts.each do |post| %>
<td>
<dl> <%= post.title %>
<dt> <%= post.body %> </dt>
<dd><%= post.tags %> </dd>
</dl>
<%= gravatar_for post.user, size: 40%> Created by <b><%= post.user.name if post.user %></b>
</td>
users_helper.rb:
module UsersHelper
def gravatar_for(user, options = { size: 50 })
gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
size = options[:size]
gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}?s=#{size}"
image_tag(gravatar_url, alt: user.name, class: "gravatar")
end
end
任何想法如何解決問題?
問題出在gravatar_for
內部,您在此處調用...
Digest::MD5::hexdigest(user.email.downcase)
所需的user
對象不存在。
當您引用以下內容時,這是由您的posts#index
模型引起的 :
<%= gravatar_for post.user, size: 40%> Created by <b><%= post.user.name if post.user %>
如評論中所建議,這可能是由於您沒有與post
相關的user
對象。
立即修復將使用一些條件邏輯來確定user
是否存在(您已經在執行此操作,但僅用於post.user.name
輸出):
<% if post.user %>
<%= gravatar_for post.user, size: 40 %> Created by <b><%= post.user.name %>
<% end %>
或者,您可能希望通過驗證來確定是否設置了關聯的對象,以使所有帖子都擁有一個用戶:
#app/models/user.rb
class User < ActiveRecord::Base
has_many :posts, inverse_of: :user
end
#app/models/post.rb
class Post < ActiveRecord::Base
belongs_to :user, inverse_of: :posts
validates :user, present: true
end
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