I use Devise for authentication in my Rails API app. Sometimes I see following error in the logs:
ActiveRecord::StatementInvalid: PGError: ERROR: prepared statement "a3926" already exists: UPDATE "users" SET "current_sign_in_at" = $1, "last_sign_in_at" = $2, "sign_in_count" = $3, "updated_at" = $4 WHERE "users"."id" = 12345
The error is coming out of Devise:
def update_tracked_fields!(request)
old_current, new_current = self.current_sign_in_at, Time.now.utc
self.last_sign_in_at = old_current || new_current
self.current_sign_in_at = new_current
old_current, new_current = self.current_sign_in_ip, request.remote_ip
self.last_sign_in_ip = old_current || new_current
self.current_sign_in_ip = new_current
self.sign_in_count ||= 0
self.sign_in_count += 1
# error happens below
save(validate: false) or raise "Devise trackable could not save #{inspect}." \
"Please make sure a model using trackable can be saved at sign in."
end
As I understand this error usually happens when there is something wrong with how database connections are used. Is there something I should be looking for?
If you are using a server which forks your process (like unicorn) you need to create a connection for every forked process.
In case of unicorn add this:
#config/unicorn.rb
before_fork do |server, worker|
Signal.trap 'TERM' do
puts 'Unicorn master intercepting TERM and sending myself QUIT instead'
Process.kill 'QUIT', Process.pid
end
defined?(ActiveRecord::Base) and
ActiveRecord::Base.connection.disconnect!
end
after_fork do |server, worker|
Signal.trap 'TERM' do
puts 'Unicorn worker intercepting TERM and doing nothing. Wait for master to sent QUIT'
end
defined?(ActiveRecord::Base) and
ActiveRecord::Base.establish_connection(
Rails.application.config.database_configuration[Rails.env]
)
end
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