Is there a Rails equivalent to PHP's isset()?

Question

Basically just a check to make sure a url param was set. How I'd do it in PHP:

if(isset($_POST['foo']) && isset($_POST['bar'])){} 

Is this the rough/best equivalent to isset() in RoR?

if(!params['foo'].nil? && !params['bar'].nil?) end 

Answer 1

The closer match is probably #present?

# returns true if not nil and not blank params['foo'].present? 

There are also a few other methods

# returns true if nil params['foo'].nil?  # returns true if nil or empty params['foo'].blank? 

Answer 2

You can also use defined?

See example from: http://www.tutorialspoint.com/ruby/ruby_operators.htm

foo = 42 defined? foo    # => "local-variable" defined? $_     # => "global-variable" defined? bar    # => nil (undefined) 

Many more examples at the linked page.