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

ruby-on-rails ruby

The closer match is probably #present?

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

There are also a few other methods

# returns true if nilparams['foo'].nil?# returns true if nil or emptyparams['foo'].blank?

ruby-on-rails ruby

You can also use defined?

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

Many more examples at the linked page.

ruby-on-rails ruby

Yes. .nil? is the equivalent of isset() in that case when checking the existence of a key in a Hash.

You should use Hash's key? method, which returns true if the given key is present in the receiver:

if(params.key?('foo') && params.key?('bar')) end

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