Testing rails without fixtures

vosechu@create-on.com (Chuck Vose) — Wed, 25 Apr 2007 16:21:00 -0500

At On & On Creative we have a lot of sites on a common rails backend. It’s incredibly flexible so we can offer a lot of support to customers but because there are so many customers with different needs testing has become a huge pain. Not only does it let us run tests custom to each client, it provides a way to import the data to the test db really easily and it’s way faster than loading the fixtures each time you start a test. Yay!

After googling around I happened upon this caboo.se article about how to run without fixtures at all. It’s a very indepth article with lots of good things in it; far be it for me to try to compete.

Instead, here’s the low down on how we prepare each of our sites for testing.

Add the following to the end of your rails_root Rakefile:


class Rake::Task
  def detract(prerequisite)
    @prerequisites.delete(prerequisite)
  end
end

%w(units functionals integration recent uncommitted).each do |task|
  Rake::Task["test:#{task}"].detract('db:test:prepare')
  Rake::Task["test:#{task}"].enhance(['environment'])
end

Add the following to lib/tasks/fixtures.rake. Make sure to look at the two commented lines:


# This code courtesy of the "Rails Recipe's book":http://www.pragmaticprogrammer.com/titles/fr_rr/ I believe. 
namespace :db do
  namespace :fixtures do

    desc 'Create YAML test fixtures from data in an existing database. Defaults to development database. Set RAILS_ENV to override.'
    task :dump => :environment do
      # Remove the limit if you want to. It's a timesaver mostly
      sql  = "SELECT * FROM %s LIMIT 0,1000" 
      # Add tables you don't want dumped. 
      skip_tables = ["schema_info", "plugin_schema_info", "engine_schema_info", "sessions"]
      ActiveRecord::Base.establish_connection(:development)
      (ActiveRecord::Base.connection.tables - skip_tables).each do |table_name|
        i = "000" 
        File.open("#{RAILS_ROOT}/test/fixtures/#{table_name}.yml", 'w') do |file|
          data = ActiveRecord::Base.connection.select_all(sql % table_name)
          file.write data.inject({}) { |hash, record|
            hash["#{table_name}_#{i.succ!}"] = record
            hash
          }.to_yaml
        end
      end
    end
  end
end

Then the fun easy stuff happens:


rake db:fixtures:dump RAILS_ENV=production
rake db:fixtures:load RAILS_ENV=test
rake test:plugins PLUGIN=your_plugin

If you want to commit the fixtures to the repo you can but it seems a waste to me since you might be regenerating them often.

Also, check the two comments in the fixtures.rake, it could be doing things you don’t expect.

The Vose Way: Tag testing

Testing rails without fixtures