Rails/SaveBang does not work with instance variables

[markokajzer]

Expected behavior

Local variable

@user = User.create(create_params)
if @user.persisted?
  do_work
end

and instance variable

user = User.create(create_params)
if user.persisted?
  do_work
end

behave the same.

Actual behavior

They do not 👇

Local variable

class UsersController < ApplicationController
  def create
    user = User.create(create_params)

    if user.persisted?
      redirect_to root_path
    else
      redirect_to other_path
    end
  end
end

Inspecting 1 file
.

1 file inspected, no offenses detected

Instance variable

class UsersController < ApplicationController
  def create
    @user = User.create(create_params)

    if @user.persisted?
      redirect_to root_path
    else
      redirect_to other_path
    end
  end
end

Inspecting 1 file
C

Offenses:

app/controllers/users_controller.rb:3:18: C: [Correctable] Rails/SaveBang: Use create! instead of create if the return value is not checked.
    @user = User.create(create_params)
                 ^^^^^^

Steps to reproduce the problem

See above.

RuboCop version

$ [bundle exec] rubocop -V
1.59.0 (using Parser 3.2.2.4, rubocop-ast 1.30.0, running on ruby 3.2.0) [arm64-darwin21]
  - rubocop-rails 2.23.1

[markokajzer]

Seems like one can workaround this issue by using .new + #save instead of .create + .persisted? 🤔