Fyi, using Rails.
Given user = User.find(1)
This case statement returns nil when it should return the result of self.do_something_with_user.
def case_method case self.class when User self.do_something_with_user # assume does not return nil when SomeOtherClass self.do_something_else else nil end end user.case_method # => nil What am I missing? Using pry, self.class == User returns true.
Ruby's case statement is much more flexible than most other switch statements. It uses the === operator, not the == operator. Classes define the === operator along the lines of
def ===(other) other.is_a? self #self is the class end
So, what you actually want here is:
def case_method case self when User do_something_with_user when SomeOtherClass do_something_else end # else is un-needed as it will return nil by default end Ruby's case uses === (the case equality operator) to check equality.
While 0.class == Fixnum results in true, 0.class === Fixnum results in false.
do_something_with_userreturn? Is it possible that it returnsnil? Try debug printing to determine exactly which branch gets executed.