Can't update records in my Rails database migrations

Question

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?

Answer 1

It looks like it might be a naming conflict with Task. Does it fail with any other class in your application or just Task?

You might be able to call it using ::Task to indicate that you want the Task class in the root namespace. Rake, for example, defines its own Task class and it's possible that something in the migration process is doing the same.

Answer 2

Try adding

Task.reset_column_information

right before your update_all