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rubyobjectcomparison

ruby: check if two variables are the same instance

I have a class Issue in which each class has a key field. Because keys are meant to be unique, I overrode the comparison operator such that two Issue objects are compared based on key like so:

def ==(other_issue)
  other_issue.key == @key
end

However, I am dealing with a case in which two there may be two variables referring to the same instance of an Issue, and thus a comparison by key would not distinguish between them. Is there any way I could check if the two variables refer to the same place?

Solution

  • According to the source, the Object#equal? method should do what you're trying to do:

    // From object.c
rb_obj_equal(VALUE obj1, VALUE obj2)
{
    if (obj1 == obj2) return Qtrue;
    return Qfalse;
}

    So the ruby code you would write is:

    obj1.equal?(obj2)