How can the user view the post, i.e. the value of last_read_post_number is changed through which interface
You may need to elaborate a little more as I’m not sure your issue is properly explained.
(If you could also give your topic a more descriptive title that would be great 
)
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I want to know how users can count to read this post, how to update
The user views the post when they view it in the browser?
When the post is displayed in their browser it’s updated and, I think, posted back to Rails.
Is there a problem that you are trying to solve with the last_read_post_number?