No method error - save from rubystutorial.org - ruby-on-rails

Question

I've been following along Hartl's book at rubystutorial.org and stuck on this error
When I run rspec tests it tells me that the method (save) does not exist for user
Here's my code and test. I can't find what's wrong with it and why the method doesn't exist within #user
user_spec.rb
require 'spec_helper'
describe User do
before do
#user = User.new(name: "Example User", email: "user#example.com")
end
subject { #user }
it { should respond_to(:name) }
it { should respond_to(:email) }
it { should be_valid }
describe "when name is not present" do
before { #user.name = " " }
it { should_not be_valid }
end
describe "when email is not present" do
before { #user.email = " " }
it { should_not be_valid }
end
describe "when name is too long" do
before { #user.name = "a" * 51 }
it { should_not be_valid }
end
describe "when email format is invalid" do
it "shoud be invalid" do
addresses = %w[user#foo,com user_at_foo.org example.user#foo. foo#bar_baz.com foo#bar+baz.com]
addresses.each do |invalid_address|
#user.email = invalid_address
expect(#user).not_to be_valid
end
end
end
describe "when email format is valid" do
it "should be valid" do
addresses = %w[user#foo.COM A_US-ER#f.b.org frst.lst#foo.jp a+b#baz.cn]
addresses.each do |valid_address|
#user.email = valid_address
expect(#user).to be_valid
end
end
end
describe "when email address is already taken" do
before do
user_with_same_email = #user.dup
user_with_same_email = #user.email.upcase
user_with_same_email.save
end
it { should_not be_valid }
end
end
And my user.rb
class User < ActiveRecord::Base
before_save { self.email = email.downcase }
validates(:name, presence: true, length: { maximum: 50 } )
VALID_EMAIL_REGEX = /\A[\w+\-.]+#[a-z\d\-.]+\.[a-z]+\z/i
validates(:email, presence: true, format: { with: VALID_EMAIL_REGEX },
uniqueness: { case_sensitive: false } )
end
Exact error is
Failures:
1) User when email address is already taken
Failure/Error: user_with_same_email.save
NoMethodError:
undefined method `save' for "USER#EXAMPLE.COM":String
# ./spec/models/user_spec.rb:55:in `block (3 levels) in <top (required)>'
Finished in 0.411 seconds
24 examples, 1 failure
Failed examples:
rspec ./spec/models/user_spec.rb:58 # User when email address is already take

Answer 1

You are defining a user and then change it on string (email, so email has no save method) in the next lines:
user_with_same_email = #user.dup
user_with_same_email = #user.email.upcase
user_with_same_email.save
You should change it for this:
user_with_same_email = #user.dup
user_with_same_email.email = #user.email.upcase
user_with_same_email.save

Answer 2

Object
The problem here can be seen with the error itself:
undefined method `save' for "USER#EXAMPLE.COM":String
The problem you have is not that .save is unavailable, but that the object you're trying to call it on is unable to process it.
The problem is specifically to do with this line:
user_with_same_email = #user.email.upcase
--
Fix
The issue is you're setting the user_with_same_email variable as #user.email.upcase. You can do what zishe suggested (to set the email attribute of the new variable)
I don't really understand what you're trying to achieve - as your User model sets the email to downcase on the before_save callback.