Question

—–UPDATE—–

Well, seems that the problem was in last.id. When database is created works OK, but when not fails. Now the question is different: How can I create a field using the id from the same row?

——–ORIGINAL——

I’m working with active record in pure ruby (without Rails), and I’m literally getting crazy with this.
This is my code

class Enviroment < ActiveRecord::Base
    #self.table_name = 'enviroments'
    self.connection.create_table(:enviroments, :force=>true) do |t|
        t.column :name, :string, :default=>'env-'+ (last.id-1).to_s
        t.column :ssh, :string, :default=>nil
    end
end

and here the error:

ActiveRecord::StatementInvalid: Could not find table 'enviroments'
from /usr/lib/ruby/gems/1.8/gems/activerecord-3.2.3/lib/active_record/connection_adapters/sqlite_adapter.rb:465:in `table_structure'

if I useself.table_name = 'enviroments' still not working. I’ve updated the gems and neither.
I’m newbie with ruby and databases, but I can’t understand this problem, I think this same code worked in the past :S

Answer 1

Finally, this was my solution:

class Enviroment < ActiveRecord::Base
after_create :create_default

private
def create_default
    if name == nil
        s = 'env-' + self.id.to_s
        self.name = s
        self.save
    end
end

end

class CreateSchema < ActiveRecord::Migration
create_table(:enviroments, :force=>true) do |t|
    t.column :name, :string, :default=>nil
    t.column :ssh, :string, :default=>nil
end