instance method `try`

Ruby on Rails 3.1.12

Since v2.3.18

Available in: v2.3.18 v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

try(*a, &b)

Invokes the method identified by the symbol method, passing it any arguments and/or the block specified, just like the regular Ruby Object#send does.

Unlike that method however, a NoMethodError exception will not be raised and nil will be returned instead, if the receiving object is a nil object or NilClass.

If try is called without a method to call, it will yield any given block with the object.

Examples

Without try

@person && @person.name

@person ? @person.name : nil

With try

@person.try(:name)

try also accepts arguments and/or a block, for the method it is trying

Person.try(:find, 1)
@people.try(:collect) {|p| p.name}

Without a method argument try will yield to the block unless the receiver is nil.

@person.try { |p| "#{p.first_name} #{p.last_name}" }

Parameters

a rest
b block

Source

# File activesupport/lib/active_support/core_ext/object/try.rb, line 28
  def try(*a, &b)
    if a.empty? && block_given?
      yield self
    else
      __send__(*a, &b)
    end
  end

Defined in activesupport/lib/active_support/core_ext/object/try.rb line 28 · View on GitHub · Improve this page · Find usages on GitHub

Defined in Object

Signature

Examples

Parameters