Rails: Special classes based on params in views

Question

What is the best way to add classes to table cells in rails based on differing criteria for each cell?

For example...I have a date cell: If the date is coming up on 10 days from that date, need to add a "upcoming-due" class. Or if the date is past today, add a "past-due" class.

On another cell, based on a string, it needs to have a class "on" or "off".

I'm not sure how to do this, but I do know I probably shouldn't have a bunch of logic in the views...

Please advise.

Answer 1

You could accomplish it with something like this:

class="#{(@date - Time.now <= 10.days) ? upcoming_due : '' %>"

However, as you mentioned, it's not good to have a lot of logic in the view. If you find yourself repeating the same code, you can add helper methods which look like this:

def upcoming(date)
  (date - Time.now <= 10.days) ? 'upcoming_due' : ''
end

def past(date)
  (date - Time.now <= 10.days) ? 'past_due' : ''
end

In your view, you'd have something like this:

class="#{ upcoming(@date).presence || past(@date).presence || '' }"