Question

I am working on a Rails 3 application and need to display some test results in the following format:

TestLower     TestResult    TestUpper
1.1           1.5           2.0

What I would like to do, is give the result one css class if the value is within the Lower and Upper limit and then give it a different css class if the value falls outside of the range.

I have used if and unless statements before but this is a little more complicated because I need to compare one value against two others, rather than one value against one other.

The only way I can think of doing it would involve quite a few if statements and fallbacks. Such as ‘if @lab.TestResult > @lab.TestLower’ and then have another one the same that checks it’s lower than the TestUpper.

Is there a simple way of doing this? Maybe a rails number helper of some form?

Any help would be appreciated!

Answer 1

Ruby also has between?:

if (value.between?(lower, higher)) 
   ...

You could use this in combination with the content_tag helper in rails:

content_tag(:span, value, :class => value.between?(lower, higher) ? "between" : "not-between")