无法更新 Rails 数据库迁移中的记录
例如，我有以下迁移
class AddStatusField < ActiveRecord::Migration
def self.up
add_column :tasks, :status, :string
Task.update_all "status='complete'", "completed = 't'"
remove_column :tasks, :completed
end
end
当我运行此命令（使用 rake db:migrate）时，我收到以下消息
== AddStatusField: migrating =================================================
-- add_column(:tasks, :status, :string)
-> 0.0010s
-- update_all("status='complete'", "completed = 't'")
rake aborted!
An error has occurred, this and all later migrations canceled:
undefined method `update_all' for #<ActiveRecord::ConnectionAdapters::SQLite3Adapter:0xd3d34a8>
如果我立即运行迁移，它会再次出现 update_all 调用工作。
我正在使用 Rails 2.3.5 和 sqlite3。
什么给？
For example I have the following migration
class AddStatusField < ActiveRecord::Migration
def self.up
add_column :tasks, :status, :string
Task.update_all "status='complete'", "completed = 't'"
remove_column :tasks, :completed
end
end
When I run this (using rake db:migrate) I get the following message
== AddStatusField: migrating =================================================
-- add_column(:tasks, :status, :string)
-> 0.0010s
-- update_all("status='complete'", "completed = 't'")
rake aborted!
An error has occurred, this and all later migrations canceled:
undefined method `update_all' for #<ActiveRecord::ConnectionAdapters::SQLite3Adapter:0xd3d34a8>
If I immediately run the migration it again the update_all calls appear to work.
I'm using Rails 2.3.5 and sqlite3.
What gives?
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看起来可能与
Task命名冲突。应用程序中的任何其他类都会失败，还是只是Task会失败？您可以使用
::Task来调用它，以表明您希望在根命名空间中使用Task类。例如，Rake 定义了自己的Task类，并且迁移过程中的某些操作可能会执行相同的操作。It looks like it might be a naming conflict with
Task. Does it fail with any other class in your application or justTask?You might be able to call it using
::Taskto indicate that you want theTaskclass in the root namespace. Rake, for example, defines its ownTaskclass and it's possible that something in the migration process is doing the same.尝试
在 update_all 之前添加
Try adding
right before your update_all