Mysql 到 PostgreSql Rails 3 heroku 应用程序 true/false

【问题标题】：Mysql to PostgreSql Rails 3 heroku app true/falseMysql 到 PostgreSql Rails 3 heroku 应用程序 true/false
【发布时间】：2012-04-18 02:58:17
【问题描述】：

在我推送到 heroku 之前一切正常，我认为这与 mysql 和 postgres 显示布尔值的不同方式有关？

我在 Max OSX 上使用 Ruby 1.9.2p318 和 Rails 3.2.2 和 Mysql 5.2.35 >

这是我要运行的查询

@special_offers = Wine.find(:all, :include => [:inventories], :conditions => ["inventories.special = ? AND inventories.warehouse_id IN (?)", "true", @wharehouses_array], :order => "inventories.updated_at DESC", :limit => 3)

看来问题出在inventories.special = ?, "true" 这在 mysql 上运行良好，但当我推送到使用 postgres 的 heroku 时却不行

我尝试将“true”替换为 1 和“1”和“t”以及 t 和 true，但似乎没有任何效果？

更新：
Heroku 日志文件 
2012-04-04T14:06:58+00:00 app[web.1]: [2012-04-04 14:06:58] INFO  WEBrick 1.3.1
2012-04-04T14:06:58+00:00 app[web.1]: [2012-04-04 14:06:58] INFO  WEBrick::HTTPServer#start: pid=1 port=54181
2012-04-04T14:06:58+00:00 app[web.1]: [2012-04-04 14:06:58] INFO  ruby 1.9.2 (2011-07-09) [x86_64-linux]
2012-04-04T14:06:59+00:00 heroku[web.1]: State changed from starting to up
2012-04-04T14:07:01+00:00 app[web.1]: => Booting WEBrick
2012-04-04T14:07:01+00:00 app[web.1]: => Call with -d to detach
2012-04-04T14:07:01+00:00 app[web.1]: => Ctrl-C to shutdown server
2012-04-04T14:07:01+00:00 app[web.1]: 
2012-04-04T14:07:01+00:00 app[web.1]: => Rails 3.2.2 application starting in production on http://0.0.0.0:54181
2012-04-04T14:07:01+00:00 app[web.1]: 
2012-04-04T14:07:01+00:00 app[web.1]: Started GET "/" for 41.119.121.138 at 2012-04-04 14:07:01 +0000
2012-04-04T14:07:02+00:00 app[web.1]: Processing by HomeController#index as HTML
2012-04-04T14:07:03+00:00 app[web.1]:   Rendered partials/_display_wines.html.erb (169.1ms)
2012-04-04T14:07:03+00:00 app[web.1]:   Rendered partials/_display_wines.html.erb (0.0ms)
2012-04-04T14:07:03+00:00 app[web.1]:   Rendered partials/_display_wines.html.erb (8.1ms)
2012-04-04T14:07:03+00:00 app[web.1]:   Rendered home/index.html.erb within layouts/application (259.9ms)
2012-04-04T14:07:03+00:00 app[web.1]:   Rendered partials/_header_bar.html.erb (6.5ms)
2012-04-04T14:07:03+00:00 app[web.1]:   Rendered partials/_main_links.html.erb (0.3ms)
2012-04-04T14:07:03+00:00 app[web.1]:   Rendered partials/_footer.html.erb (4.9ms)
2012-04-04T14:07:03+00:00 app[web.1]: Completed 200 OK in 1081ms (Views: 345.8ms | ActiveRecord: 175.7ms | Solr: 0.0ms)
2012-04-04T14:07:03+00:00 app[web.1]: cache: [GET /] miss
2012-04-04T14:07:03+00:00 heroku[router]: GET stormy-fog-6888.herokuapp.com/ dyno=web.1 queue=0 wait=0ms service=1350ms status=200 bytes=36808
2012-04-04T14:07:04+00:00 heroku[router]: GET stormy-fog-6888.herokuapp.com/javascripts/jquery.js dyno=web.1 queue=0 wait=0ms service=137ms status=304 bytes=0
2012-04-04T14:07:04+00:00 heroku[router]: GET stormy-fog-6888.herokuapp.com/stylesheets/style1.css dyno=web.1 queue=0 wait=0ms service=179ms status=304 bytes=0
2012-04-04T14:07:04+00:00 app[web.1]: cache: [GET /stylesheets/style1.css] miss
2012-04-04T14:07:04+00:00 app[web.1]: cache: [GET /javascripts/jquery.js] miss

+00:00 app[web.1]: cache: [GET /javascripts/script1.js] miss
2012-04-04T14:07:04+00:00 heroku[router]: GET stormy-fog-6888.herokuapp.com/javascripts/script1.js dyno=web.1 queue=0 wait=0ms service=187ms status=304 bytes=0
2012-04-04T14:07:04+00:00 heroku[router]: GET stormy-fog-6888.herokuapp.com/javascripts/PIE.js dyno=web.1 queue=0 wait=0ms service=185ms status=304 bytes=0
2012-04-04T14:07:04+00:00 heroku[router]: GET stormy-fog-6888.herokuapp.com/javascripts/rails.js dyno=web.1 queue=0 wait=0ms service=189ms status=304 bytes=0
2012-04-04T14:07:04+00:00 app[web.1]: cache: [GET /javascripts/PIE.js] miss
2012-04-04T14:07:04+00:00 app[web.1]: cache: [GET /javascripts/rails.js] miss
2012-04-04T14:07:04+00:00 app[web.1]: cache: [GET /images/header_tile.png] miss
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2012-04-04T14:07:04+00:00 app[web.1]: cache: [GET /images/none.png] miss
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2012-04-04T14:07:04+00:00 app[web.1]: cache: [GET /images/cybercellar_logo.jpg] miss
2012-04-04T14:07:04+00:00 app[web.1]: cache: [GET /images/flags.png] miss
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2012-04-04T14:07:04+00:00 heroku[router]: GET stormy-fog-6888.herokuapp.com/images/cybercellar_logo.jpg dyno=web.1 queue=0 wait=0ms service=84ms status=304 bytes=0
2012-04-04T14:07:04+00:00 app[web.1]: cache: [GET /images/header_login.png] miss
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2012-04-04T14:07:05+00:00 app[web.1]: cache: [GET /images/no_wine.png] miss
2012-04-04T14:07:05+00:00 heroku[router]: GET stormy-fog-6888.herokuapp.com/images/no_wine.png dyno=web.1 queue=0 wait=0ms service=22ms status=304 bytes=0
2012-04-04T14:07:05+00:00 app[web.1]: cache: [GET /images/buttons2.png] miss
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2012-04-04T14:07:05+00:00 app[web.1]: cache: [GET /images/find_wine_wrap.png] miss
2012-04-04T14:07:05+00:00 heroku[router]: GET stormy-fog-6888.herokuapp.com/images/find_wine_wrap.png dyno=web.1 queue=0 wait=0ms service=22ms status=304 bytes=0
2012-04-04T14:07:05+00:00 app[web.1]: cache: [GET /images/comment.png] miss
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2012-04-04T14:07:05+00:00 app[web.1]: cache: [GET /images/bullet.png] miss

4:07:05+00:00 heroku[router]: GET stormy-fog-6888.herokuapp.com/images/bullet.png dyno=web.1 queue=0 wait=0ms service=13ms status=304 bytes=0
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2012-04-04T14:07:05+00:00 app[web.1]: cache: [GET /images/links_bar.png] miss
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2012-04-04T14:07:05+00:00 app[web.1]: cache: [GET /images/cart_background.png] miss
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2012-04-04T14:07:05+00:00 app[web.1]: cache: [GET /images/home_page_image.png] miss
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2012-04-04T14:07:05+00:00 app[web.1]: cache: [GET /images/find_wine.png] miss
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2012-04-04T14:07:06+00:00 app[web.1]: cache: [GET /images/credit_cards.png] miss
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2012-04-04T14:07:06+00:00 app[web.1]: cache: [GET /images/money_back.png] miss
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架构文件：用于库存表
create_table "inventories", :force => true do |t|
    t.integer   "wine_id"
    t.integer   "warehouse_id"
    t.integer   "stock"
    t.float     "price"
    t.integer   "quantity_id"
    t.timestamp "created_at"
    t.timestamp "updated_at"
    t.boolean   "available",                        :default => false
    t.boolean   "discount",                         :default => false
    t.string    "markupprofile_id",   :limit => 45
    t.string    "discountprofile_id", :limit => 45
    t.float     "discount_price"
    t.boolean   "special",                          :default => false
  end

【问题讨论】：

  • 生成的 SQL 和来自 PostgreSQL 的错误会有所帮助。一旦你得到了这些，有人可以马上告诉你。实际上，一旦你有了这些，你可能就不需要问了。
  • 似乎没有任何效果 不是有效的错误消息。
  • 我查看了heroku日志文件，它没有显示任何错误消息，它只是在使用Wine.find(:all, :include => [:inventories], :conditions => ["inventories.special = ? ", "true"])时不查询字段，因为postgresql中的“true”值不一样?

标签： mysql ruby ruby-on-rails-3 postgresql


【解决方案1】：

使用实际的 TrueClass，而不是字符串，Rails 会为您翻译成正确的查询。

正确：

"inventories.special = ?", true

不正确：

"inventories.special = ?", "true"

它不会抛出错误，因为第二个仍然会产生一个有效的查询，它只是在寻找其中 special 是包含实际 t-r-u-e 字符的字符串的记录。

【讨论】：

  • 好的，我将"inventories.special = ?", "true" 更改为"inventories.special = ?", true，但现在它没有显示任何结果？让我快速看一下架构文件
  • 看起来该列实际上是布尔值，或者在mysql中显示为tinyint，这是正确的吗？
  • 是的，因为您的特殊字段是布尔值，请使用 true/false。假设您确实有 special 为真的记录并且您没有看到任何结果，那么它与您的查询的另一部分有关。
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