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Help us understand the problem. What is going on with this article?
@YumaInaura

#Rails ActiveRecord / detect updated DB records on instance / saved_changes?

More than 1 year has passed since last update.
# Model Instance
user = User.first

user.saved_changes?
# => false

user.update!(name: "Alice")
# User Update (0.8ms)  UPDATE `users` SET `name` = 'Alice', `updated_at` = '2020-01-26 05:35:18' WHERE `users`.`id` = 1

user.saved_changes?
# => true

user.reload
user.saved_changes?
# => false

# When nothing commit on DB
user.update!(name: "Alice")
# (0.6ms)  BEGIN
# (0.5ms)  COMMIT

user.saved_changes?
# => false
# Then saved_changess?

user.update!(name: "Bob")
user.saved_changes?
# => true


user.reload
user.saved_changes?
# => false

user.name = "Carol"
user.saved_changes?
# => false

user.user.has_changes_to_save?
# => true

user.save!
user.saved_changes?
# => true

Original by Github issue

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YumaInaura
Ruby on Rails 業務経験 約5年 / Perl PHP Python Golang Linux Apache MySQL BigQuery Jenkins ansible AWS など / いなうらゆうま / YumaInaura / 稲浦悠馬

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Help us understand the problem. What is going on with this article?