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Fix for nil object error in Rails test fixtures

If you're seeing errors like this when you run Rails tests:

# NoMethodError: You have a nil object when you didn't expect it!


You might need to edit test/test_helper.rb to make sure use_instantiated_fixtures is true:

self.use_instantiated_fixtures = true


Prior to 1.0, Rails automatically created instance variables out of fixtures. So if you had a fixture record named "foo", you could access it in your test as "@foo". As of 1.0, the default is to disable that feature, which breaks a lot of existing code. Mike Clark explains the change.
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