Rspec is considering an attribute as a method

I am trying to post an authenticate method:

post :authenticate, params: 
  { 'email' => @user.email, 'password' => @user.password }

This user is created on before(:each) but Rspec is considering email and password as methods and I get this error

NoMethodError:
       undefined method `email' for #<Array:0x00559ddd541d18>

if I change @user.email and @user.password to string the test pass.

I would like to know if I can say to Rspec to consider .email and .password as attributes of user and not methods.