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Ruby ActiveRecord Basics Callbacks Using Callbacks

Posted by Geoffrey Emerson
Geoffrey Emerson
18,726 Points

My amount got truncated! What's going on?

I was following along with adding "calculate_amount!" into the program, but I received an odd result.

My first time entry was 1.2 hours, resulting in 1.2 * 34 = 40.8. But for some reason only 40 was saved.

>> t = TimeEntry.first
  TimeEntry Load (0.4ms)  SELECT  `account_entries`.* FROM `account_entries` WHERE `account_entries`.`type` IN ('TimeEntry')  ORDER BY `account_entries`.`id` ASC LIMIT 1
=> # TimeEntry id: 1, time: 1.2, customer_id: 1, employee_id: 2, created_at: "2015-09-22 05:38:50", updated_at: "2015-09-23 01:49:05", account_id: 1, type: "TimeEntry", amount: nil
>> t.calculate_amount!
=> 40.8
>> t
=> # TimeEntry id: 1, time: 1.2, customer_id: 1, employee_id: 2, created_at: "2015-09-22 05:38:50", updated_at: "2015-09-23 01:49:05", account_id: 1, type: "TimeEntry", amount: 40
>> t.save
   (0.2ms)  BEGIN
  Account Load (1.2ms)  SELECT  `accounts`.* FROM `accounts` WHERE `accounts`.`id` = 1 LIMIT 1
  Account Exists (10.0ms)  SELECT  1 AS one FROM `accounts` WHERE (`accounts`.`name` = BINARY 'Bob\'s Emporium' AND `accounts`.`id` != 1) LIMIT 1
  SQL (5.6ms)  UPDATE `account_entries` SET `amount` = 40, `updated_at` = '2015-09-25 22:33:39' WHERE `account_entries`.`id` = 1
   (10.7ms)  COMMIT
=> true

For some reason this is not displaying properly. I had to remove the angle brackets. Anyway...

Only 40 was saved in the variable after the calculation returned 40.8, and then again only 40 was added to the database.

1 Answer

Paul Ogawa
Paul Ogawa
6,570 Points
Paul Ogawa
Paul Ogawa
6,570 Points

The only thing I can see if if you are saving the amount as an int or a float. Perhaps see if it is an int and change it to a float?

Geoffrey Emerson
Geoffrey Emerson
18,726 Points

It is a decimal. I'm following the video. In the schema it is listed as t.decimal "amount", precision: 10.