Database Migration Can't Assign/Update Newly Created Columns

I wrote a database migration today that I ran in to some problems with.  The migration simply adds a column to a table, and then assigns a value to the new column.  All appeared to work when the migration ran.  But, when I checked the database afterwards, the column was added to the table but the value that I assigned was not set.  Here is my example:

class AddAndSetColumn < ActiveRecord::Migration

def self.up    
add_column :nodes, :new_column_1, :boolean, :null => false, :default => false

Node.find(:all).each do |n|
n.new_column_1 = true
n.save!
end

end

def self.down
remove_column :nodes, :new_column_1
end
end

After running the migration, and looking at the database, all nodes had new_column_1 set to false, even though I explicitly set it to true in the migration.

After searching around to see why this happens, I found a posting that described this problem at http://groups.google.com/group/rubyonrails-talk/browse_thread/thread/573cbb96b84f3306/a0d6a3c7dddbbbcb?lnk=raot. The solution for this is to call reset_column_information on the model for the table that you added the column to before you assign values. So I changed my migration to:

class AddAndSetColumn < ActiveRecord::Migration

def self.up    
add_column :nodes, :new_column_1, :boolean, :null => false, :default => false
Node.reset_column_information    

Node.find(:all).each do |n|
n.new_column_1 = true
n.save!
end

end

def self.down
remove_column :nodes, :new_column_1
end
end

And it works!