How do I list all objects created from a class in Ruby? [duplicate]
You can use the ObjectSpace module to do this, specifically the each_object method.
ObjectSpace.each_object(Project).countFor completeness, here's how you would use that in your class (hat tip to sawa)
class Project # ... def self.all ObjectSpace.each_object(self).to_a end def self.count all.count endend
One way to do is to keep track of it as and when you create new instances.
class Project @@count = 0 @@instances = [] def initialize(options) @@count += 1 @@instances << self end def self.all @@instances.inspect end def self.count @@count endendIf you want to use ObjectSpace, then its
def self.count ObjectSpace.each_object(self).countenddef self.all ObjectSpace.each_object(self).to_aend
class Project def self.all; ObjectSpace.each_object(self).to_a end def self.count; all.length endend