RSpec 1 (Rails 2)

With the most recent spec_candy.rb helpers you can say:

User.stub_any_instance(:foo => :bar)
user = User.new
user.foo
# => :bar

RSpec 2 (Rails 3)

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RSpec 2 comes with this feature built in:

User.any_instance.stub(:foo => :bar)
user = User.new
user.foo
# => :bar

RSpec 3

RSpec Mocks 3.3: any_instance Show archive.org snapshot

allow_any_instance_of(User).to receive(:foo).and_return(:bar)
user = User.new
user.foo
# => :bar