推向Heroku时出错 - ...出现在组中 - Ruby on Rails [英] Error when pushing to Heroku - ...appear in group - Ruby on Rails
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问题描述
我正在尝试将我的第一个Rails应用程序部署到Heroku，并且似乎遇到了问题。在> git push heroku master 和 heroku rake db：migrate 后出现错误消息：
I am trying to deploy my first rails app to Heroku and seem to be having a problem. After git push heroku master, and heroku rake db:migrate I get an error saying:
SELECT posts.*, count(*) as vote_total FROM "posts" INNER JOIN "votes" ON votes.post_id = posts.id GROUP BY votes.post_id ORDER BY created_at DESC LIMIT 5 OFFSET 0):
我已经在下面列出了完整的错误， PostControll＃索引，因为它似乎是我在做分组的地方。最后我包含了我的routes.rb文件。我是ruby，rails和heroku的新手，对于简单/明显的问题感到抱歉。
I have included the full error below and also included the PostControll#index as it seems that is where I am doing the grouping. Lastly I included my routes.rb file. I am new to ruby, rails, and heroku so sorry for simple/obvious questions.
Processing PostsController#index (for 99.7.50.140 at 2010-04-21 12:50:47) [GET]
ActiveRecord::StatementInvalid (PGError: ERROR: column "posts.id" must appear in the GROUP BY clause or be used in an aggregate function
: SELECT posts.*, count(*) as vote_total FROM "posts" INNER JOIN "votes" ON votes.post_id = posts.id GROUP BY votes.post_id ORDER BY created_at DESC LIMIT 5 OFFSET 0):
vendor/gems/will_paginate-2.3.12/lib/will_paginate/finder.rb:82:in `send'
vendor/gems/will_paginate-2.3.12/lib/will_paginate/finder.rb:82:in `paginate'
vendor/gems/will_paginate-2.3.12/lib/will_paginate/collection.rb:87:in `create'
vendor/gems/will_paginate-2.3.12/lib/will_paginate/finder.rb:76:in `paginate'
app/controllers/posts_controller.rb:28:in `index'
/home/heroku_rack/lib/static_assets.rb:9:in `call'
/home/heroku_rack/lib/last_access.rb:25:in `call'
/home/heroku_rack/lib/date_header.rb:14:in `call'
thin (1.0.1) lib/thin/connection.rb:80:in `pre_process'
thin (1.0.1) lib/thin/connection.rb:78:in `catch'
thin (1.0.1) lib/thin/connection.rb:78:in `pre_process'
thin (1.0.1) lib/thin/connection.rb:57:in `process'
thin (1.0.1) lib/thin/connection.rb:42:in `receive_data'
eventmachine (0.12.6) lib/eventmachine.rb:240:in `run_machine'
eventmachine (0.12.6) lib/eventmachine.rb:240:in `run'
thin (1.0.1) lib/thin/backends/base.rb:57:in `start'
thin (1.0.1) lib/thin/server.rb:150:in `start'
thin (1.0.1) lib/thin/controllers/controller.rb:80:in `start'
thin (1.0.1) lib/thin/runner.rb:173:in `send'
thin (1.0.1) lib/thin/runner.rb:173:in `run_command'
thin (1.0.1) lib/thin/runner.rb:139:in `run!'
thin (1.0.1) bin/thin:6
/usr/local/bin/thin:20:in `load'
/usr/local/bin/thin:20
PostsController
PostsController
def index
@tag_counts = Tag.count(:group => :tag_name,
:order => 'count_all DESC', :limit => 20)
conditions, joins = {}, :votes
@ugtag_counts = Ugtag.count(:group => :ugctag_name,
:order => 'count_all DESC', :limit => 20)
conditions, joins = {}, :votes
@vote_counts = Vote.count(:group => :post_title,
:order => 'count_all DESC', :limit => 20)
conditions, joins = {}, :votes
unless(params[:tag_name] || "").empty?
conditions = ["tags.tag_name = ? ", params[:tag_name]]
joins = [:tags, :votes]
end
@posts=Post.paginate(
:select => "posts.*, count(*) as vote_total",
:joins => joins,
:conditions=> conditions,
:group => "votes.post_id",
:order => "created_at DESC",
:page => params[:page], :per_page => 5)
@popular_posts=Post.paginate(
:select => "posts.*, count(*) as vote_total",
:joins => joins,
:conditions=> conditions,
:group => "votes.post_id",
:order => "vote_total DESC",
:page => params[:page], :per_page => 3)
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @posts }
format.json { render :json => @posts }
format.atom
end
end
路线.rb
ActionController::Routing::Routes.draw do |map|
map.resources :ugtags
map.resources :wysihat_files
map.resources :users
map.resources :votes
map.resources :votes, :belongs_to => :user
map.resources :tags, :belongs_to => :user
map.resources :ugtags, :belongs_to => :user
map.resources :posts, :collection => {:auto_complete_for_tag_tag_name => :get }
map.resources :posts, :sessions
map.resources :posts, :has_many => :comments
map.resources :posts, :has_many => :tags
map.resources :posts, :has_many => :ugtags
map.resources :posts, :has_many => :votes
map.resources :posts, :belongs_to => :user
map.resources :tags, :collection => {:auto_complete_for_tag_tag_name => :get }
map.resources :ugtags, :collection => {:auto_complete_for_ugtag_ugctag_name => :get }
map.login 'login', :controller => 'sessions', :action => 'new'
map.logout 'logout', :controller => 'sessions', :action => 'destroy'
map.root :controller => "posts"
map.connect ':controller/:action/:id'
map.connect ':controller/:action/:id.:format'
end
更新后显示模型和迁移
class Post < ActiveRecord::Base
has_attached_file :photo
validates_presence_of :body, :title
has_many :comments, :dependent => :destroy
has_many :tags, :dependent => :destroy
has_many :ugtags, :dependent => :destroy
has_many :votes, :dependent => :destroy
belongs_to :user
after_create :self_vote
def self_vote
# I am assuming you have a user_id field in `posts` and `votes` table.
self.votes.create(:user => self.user)
end
cattr_reader :per_page
@@per_page = 10
end
迁移过帐
class CreatePosts < ActiveRecord::Migration
def self.up
create_table :posts do |t|
t.string :title
t.text :body
t.timestamps
end
end
def self.down
drop_table :posts
end
end
_
_
class AddUserIdToPost < ActiveRecord::Migration
def self.up
add_column :posts, :user_id, :string
end
def self.down
remove_column :posts, :user_id
end
end
推荐答案
问题是查询本身。
Postgresql在SQL查询中使用聚合函数有更严格的规则 - 您需要将列添加到您的group by子句中。
Postgresql has much stricter rules for the use of aggregate functions in SQL Queries - you need to add the columns to your group by clause.
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