ActiveRecord :: StatementInvalid：PG :: UndefinedColumn：错误

Question

I'm getting an error when trying to run rake db:migrate :

ActiveRecord::StatementInvalid: PG::UndefinedColumn: ERROR:  column "plus_ids" of relation "comments" does not exist

I guess I did do some funky stuff when trying to remove the attribute plus_ids from my comment model. I'm not sure what is going on.

If I do a rake db:reset and then fetch the live database it all works locally again, but if I try to do a rake db:migrate it throws an error again.

How can I get rid of plus_ids properly so I can migrate?

Edit 1: Here's the migration files when I added (and removed) the attribute:

class RemovePlusIdsFromComments < ActiveRecord::Migration
  def change
    remove_column :comments, :plus_ids, :integer
  end
end

And then

class AddPlusIdsToComments < ActiveRecord::Migration
  def change
    add_column :comments, :plus_ids, :integer
  end
end

They're in the wrong order in the migration list, not sure why.

Edit 2: I think there is something wrong with the Up/Down, if I run rake db:migrate:status I get this:

down    20150305203336  Remove plus ids from comments
down    20150305204404  Add plus ids to comments

Any way around this?

Answer 1

The answer was to run

rake db:migrate:up VERSION=20150305204404

On both live and local, and then

rake db:migrate

On both again. Now the live and local database is in sync again, and migrating the database throws no errors.