IF me like Ruby does

[Sven Schwyn]

Hi there

When fiddling together CSS classes in html_options of my form helpers, I
sometimes have code looking something like the following:

html_options.merge!class => "list_item" + ((options[:class_method])?("
list_item_#{object.send(options[:class_method])}")'')))

The "('')" is pretty ugly, so I'm wondering if there's a more rubyish
way to write this.

Thanks for your hints, -sven

 

[Sven Schwyn]

Here's a version that's easier to read. Assume you want to concat A and
B with a space in between provided the method add_B? returns true.

'A' + ((add_B?)?(' B')''))

The closest alternative I came up with:

['A', (' B' if add_B?)].join

The more generic form, however, will not do the trick:

['A', ('B' if add_B?)].join(' ')

However, this adds a tailing space if add_B? returns false.

 

[Bira]

Here's a version that's easier to read. Assume you want to concat A and
B with a space in between provided the method add_B? returns true.

How about "A#{add_B? ' B' :''}"?

If you use double-quoted strings, you can interpolate Ruby code into
them by using #{}.

Ruby will replace the code between #{} with a string containing the
result of the expression inside.

 

[Austin Ziegler]

How about "A#{add_B? ' B' :''}"?

"A#{"B" if add_B}"

-austin

 

[Bira]

"A#{"B" if add_B}"

Yeah, what he said .