rspec：“在示例组中不可用例如，“ describe”或“ context”块

如何解决rspec：“在示例组中不可用例如，“ describe”或“ context”块

下面提到的代码已成功为1个用户使用，我想为许多用户实现以下工作代码，因此我尝试使用迭代。

##### Below is the working code for 1 user #######

  # user
  let!(:pi_user) { FactoryBot.create(:read_only) }
  
  # PI oauth
  let!(:oauth_app_02) { FactoryBot.create(:oauth_application,owner: pi_user) }
  let!(:oauth_access_token_02) do
    FactoryBot.create(:oauth_access_token,application: oauth_app_02,resource_owner_id: pi_user.id)
  end

    describe 'GET /api/proposals return all proposals for PI user' do
      before(:each) { @headers = set_api_headers_with_user_auth(pi_user,oauth_access_token_02) }
      it 'INDEX GET /api/proposals (return all) - successful' do
        get api_proposals_path,params: {},headers: @headers
        get_all_proposals(prop_01,prop_02,prop_03)
        expect(response).to be_successful
      end
    end 

##### I tried for many users #######

  let!(:pi_user) { FactoryBot.create(:read_only) }  
  let!(:beamline_expert_user) { FactoryBot.create(:read_only) }

  # BE oauth
  let!(:oauth_app_01) { FactoryBot.create(:oauth_application,owner: beamline_expert_user) }
  let!(:oauth_access_token_01) do
    FactoryBot.create(:oauth_access_token,application: oauth_app_01,resource_owner_id: beamline_expert_user.id)
  end

  # PI oauth
  let!(:oauth_app_02) { FactoryBot.create(:oauth_application,resource_owner_id: pi_user.id)
  end


  describe 'GET (INDEX) /api/proposals return all proposals for all users' do
    abc = [beamline_expert_user,pi_user]
    xyz = [oauth_access_token_01,oauth_access_token_02]
    abc.zip(xyz).each do |user,token|
      describe "GET /api/proposals return all proposals for #{user} user" do
        before(:each) { @headers = set_api_headers_with_user_auth(user,token) }
        it 'INDEX GET /api/proposals (return all) - successful' do
          get api_proposals_path,headers: @headers
          get_all_proposals(prop_01,prop_03)
          expect(response).to be_successful
        end
      end
    end
  end  

但是在执行以上规范时会出现错误

Failure/Error: abc = [beamline_expert_user,pi_user]
  `beamline_expert_user` is not available on an example group (e.g. a `describe` or `context` block). It is only available from within individual examples (e.g. `it` blocks) or from constructs that run in the scope of an example (e.g. `before`,`let`,etc).

所以不是

“描述”

我尝试了“

它

”，但仍然无法实现所需的输出。您能否建议我如何通过对许多用户使用迭代来使其工作。

预先感谢