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#Rails ActiveRecord / detect updated DB records on instance / saved_ch
# 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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公開日時
2020-01-27
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