Rails enum

enum.rb

begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do
  source "https://rubygems.org"
  gem "activerecord"
  gem "sqlite3"
end

require "active_record"
require "minitest/autorun"
require "logger"

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :users do |t|
    t.integer :access_type, default: 0
    t.datetime :blocked_at
  end
end

class User < ActiveRecord::Base
  enum access_type: [:authorized, :blocked]
end

user = User.new
p user.access_type
user.save!
user.reload

def block(user)
  user.blocked! # This will update the database record
  user.blocked_at = Time.now # This wont update the database record
end

block(user)

puts "access_type value is"
p User.first.access_type # The access_type as been updated even though save was not called
puts "blocked_at value is"
p User.first.blocked_at # The blocked_at is not set.

# If in the block method we call save, such as below, it will update the record twice in the database.
# One call to set the access_type another to set the blocked_at
def block(user)
  user.blocked! # This will perform one update query
  user.blocked_at = Time.now
  user.save # This will perform one update query
end

# If we want to perform only one query, we have to use the enum string value to the access_type value.
# the function would be
def block(user)
  user.access_type = "blocked" # This will just set the access_type value to blocked
  user.blocked_at = Time.now
  user.save # This will perform one update query
end

My question is, How to set an enum to a specific value without saving it to db, so that it is possible to update other attributes and then call the save method to perform the db update.