railstutorial, This is deprecated behavior that will not be supported in RSpec 3

Question

I'm doing railstutorial, now chapter 11.

why this error?

WARNING: let declaration another_user accessed in a before(:all) hook at:
/Users/xxx/Documents/rails_projects/sample_app_2/spec/requests/micropost_pages_spec.rb:49:in `block (4 levels) in '

This is deprecated behavior that will not be supported in RSpec 3.

let and subject declarations are not intended to be called in a before(:all) hook, as they exist to define state that is reset between each example, while before(:all) exists to define state that is shared across examples in an example group. WARNING: let declaration another_user accessed in a before(:all) hook at:
/Users/xxx/Documents/rails_projects/sample_app_2/spec/requests/micropost_pages_spec.rb:49:in `block (4 levels) in '

my file is here. enter link description here

Answer 1

You're getting the error because you have the following code:

let(:another_user) { FactoryGirl.create(:user) }
before(:all) do
  10.times { FactoryGirl.create(:micropost, user: another_user, content: "Foooo") }
end

in which your before(:all) code makes use of the another_user variable, defined by let.

You can eliminate the warning by changing your before(:all) call to:

before(:all) do
  user = FactoryGirl.create(:user)
  10.times { FactoryGirl.create(:micropost, user: user, content: "Foooo") }
end

Note that the tutorial as currently defined at railstutorial.org does not include any code which violates the restriction.