Increasing counter in database

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rails increment

I have field called ads_counter in my database, and I need to increase its value each time when this ad is rendered.

I tried to write a custom method and use it in the controller responsible for this data, but that didn't work. Are there any built-in methods to increase the value of a field in the database?

Yes, there is the increment method that you can call in your ActiveRecord.

For reference: increment

Edit:

To make it save directly use the increment!

You may use it this way:

instance.increment!(:ads_counter)

It automatically increments by 1

instance.increment!(:ads_counter, <number>)

It increments by number provided

Incrementing counters in database – select * from depesz;, Incrementing counters in database. Some time ago It might also do something else, before, or after, the update, and it might even be not in database. And these are not transactional, so you can't rollback seq increase. Increasing Database Process Count Run the ALTER SYSTEM SET processes=300 SCOPE=SPFILE; command on the Oracle Database and restart the Oracle Database Service . If you are using the Oracle Linux operating system, run the shutdown immediate; command and then run the STARTUP pfile=init.ora; command to restart the service.

You have the method increment! that increments an attribute and saves the record

your_object.increment!(:ads_counter)

Put this code in the show method of your controller.

How to query-and-increase a value (counter) in a thread-safe way , BEGIN; SELECT `counter` FROM `table` WHERE `id` = 123 FOR UPDATE; UPDATE `table` SET `counter` = `counter`+1 WHERE `id` = 123; COMMIT; This starts a new transaction, then selects the rows you want to update and locks them exclusively. There are several tables with such counters in the database. It doesn't matter if all of them use the single global sequence for their numbers, or each table has its own individual sequence. I don't want to use a column with a datetime stamp instead of an integer counter, because:

You can try increment! method

object.increment!(:method_name)

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Firestore Increment - Counters that Scale, Firestore Increment - Counters that Scale. Fireship. Loading. Database Transactions https Duration: 3:51 Posted: Apr 8, 2019 So I was a little bored and decided to play around with Javascript. The idea was to create something like the counter on this page using javascript, HTML and a little CSS; using a different layout.

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Comments
  • If you share your structure we may help you with more information! Thank you!
  • Already found another way, using update_attributes.Thanks
  • The best way to do it is calling increment since update_attributes call validations and stuff. The increment comand does exactly and exclusivelly what you asked for.
  • Great, full answer: reverence to docs + real example + little more about + nice formatted. Thanks.
  • this method increment only by 1, or there are additional params ?
  • You can use your_object.increment!(:ads_counter, 42) ; There's a link to the doc of the method in my answer
  • Please provide details answer. Thanks