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我有一个 Rails 2 应用程序，在开发中一切正常，但在生产中，我的一个观点被打破了，我很难找出原因。

开发和生产之间的唯一区别是，出于某种原因，开发使用mysql2gem 而生产使用原始mysqlgem。

首先，如果我跟踪日志，我得到的错误是：

ActionView::TemplateError (undefined method 'map' for #<Mysql::Result:0xb5ce7844>) on line #15 of app/views/logical_interface/create.rhtml:

第 15 行是

<%= select_tag 'logical_interface[vlan_id]', options_for_select(@vlan_numbers.map(&:reverse)) %>

在控制器中定义为

@pop_id = session[:pop_id]

@vlan_numbers = ActiveRecord::Base.connection.execute("SELECT pop_vlans.id, vlan_number FROM pop_vlans WHERE (pop_id = '" + @pop_id.to_s + "' AND vlan_number = 'Untagged') OR pop_vlans.id NOT IN (SELECT logical_interfaces.vlan_id FROM logical_interfaces) AND pop_id = " + @pop_id.to_s)

我检查了@pop_id它是否失败，因为它是 nil 等，但打印出来显示正确的值。

如果我删除第 15 行并添加<%= @vlan_numbers.inspect %>所有我得到的是#，如果我这样做了，debug @vlan_numbers我#<Mysql::Result:0xb5db1298>真的很难过。

我看了看是否有任何东西mysql2不在，mysql但我能找到的mysql2只是总体上更好。

有任何想法吗？

更新

@vlan_numbers = ActiveRecord::Base.connection.select_all("SELECT pop_vlans.id, vlan_number FROM pop_vlans WHERE (pop_id = '" + @pop_id.to_s + "' AND vlan_number = 'Untagged') OR pop_vlans.id NOT IN (SELECT logical_interfaces.vlan_id FROM logical_interfaces) AND pop_id = " + @pop_id.to_s).collect { |r| r['vlan_number'] }

我尝试按照上面的建议使用我的 mbratch （答案现在已被删除），但这有点奇怪，因为Untagged添加到列表中的选项有它的文本，因此它是deggatnU. 我认为选择值也会发生同样的情况（看起来它们只是文本而不是id表中的实际值）。

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2 回答 2

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在@Vimsha 给出的基础上，您可以尝试这个将创建一个数组（列表）[id, vlan_number]对：

@vlan_numbers = ActiveRecord::Base.connection.select_all("SELECT vlan_number, pop_vlans.id FROM pop_vlans WHERE (pop_id = '" + @pop_id.to_s + "' AND vlan_number = 'Untagged') OR pop_vlans.id NOT IN (SELECT logical_interfaces.vlan_id FROM logical_interfaces) AND pop_id = " + @pop_id.to_s).map(&:values)

并摆脱.map(&:reverse)在线15。

如果你想让它真正独立于SELECT产生的顺序，那么稍微长一点：

@vlan_numbers = ActiveRecord::Base.connection.select_all("SELECT vlan_number, pop_vlans.id FROM pop_vlans WHERE (pop_id = '" + @pop_id.to_s + "' AND vlan_number = 'Untagged') OR pop_vlans.id NOT IN (SELECT logical_interfaces.vlan_id FROM logical_interfaces) AND pop_id = " + @pop_id.to_s).map { |r| [r["vlan_number"], r["id"]] }
于 2013-09-05T14:17:29.653 回答
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您收到此错误是因为 @vlan_numbers 是 Mysql::Result 对象而不是数组。如果要获取数组，请执行此操作

@vlan_numbers = ActiveRecord::Base.connection.select_all("SELECT pop_vlans.id, vlan_number FROM pop_vlans WHERE (pop_id = '" + @pop_id.to_s + "' AND vlan_number = 'Untagged') OR pop_vlans.id NOT IN (SELECT logical_interfaces.vlan_id FROM logical_interfaces) AND pop_id = " + @pop_id.to_s)
于 2013-09-05T14:01:54.660 回答