Problem
When you get the above error you cannot login to your application.
Solution
You will need to delete the cookies for the authentication, so in Firefox (Linux) go to Preferences, remove individual cookies for the specific domain.
Problem
You want to deploy to a shared host (dreamhost) that has a later version of rails from the one you have developed your application.
You also have a later version installed in your development pc,and using rake rails:freeze:gems uses the latest one and not the one you want.
Solution
Use the following to freeze the specific version you want, and by using your gems you have installed:
rake rails:freeze:gems VERSION=2.3.2
Problem
Your host (ie dreamhost) for deploying applications doesn’t have the gems you are using in your development.
Solution
After freezing your rails gems with rake rails:freeze:gems, freeze the rest of your gems, not with rake gems:freeze gem=GEM_NAME, as used in previous versions of rails, but with:
rake gems:unpack
Problem
There was a warning about an XSS vulnerability in Ruby on Rails. More details can be found here.
Solution
Upgrade to the most recent (fixed) Rails version (2.3.4):
sudo gem install rails
Problem
You have recently installed Mandriva 2009 and you want to install phusion passenger.
Solution
urpmi apache
On the selection question about the dependencies select option 1 (apache-prefork)
gem install passenger
passenger-install-apache2-module
urpmi gcc_c++
urpmi apache-devel
<VirtualHost *:80> ServerName www.yourhost.com DocumentRoot /somewhere/public </VirtualHost>
Problem
Trying to use the assert_difference with Rails 2.1.0 produces errors if trying to use it with the syntax of another rails version.
Solution
The correct syntax for using assert_difference with rails 2.1.0 is:
def test_should_create_user
assert_difference(User, :count, 1) do
user = create_user
assert !user.new_record?, "#{user.errors.full_messages.to_sentence}"
end
end
Problem
To get used to the new ways of working with Rails 2.
Solution
Here are some of the new ways of doing things in Rails 2.
./script/generate scaffold product fied1_name:string field2_name:string field3_name:float
Make sure that you don’t have any previous migration(ie manually created) for the same model, as the generator will stop and won’t overwrite the previous migration.