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Say I have a class called Post that has many initiated instances (i.e. Post.new(:name => 'foo')).
Is there a way to retrieve all the instances of that class by calling something on it?
I'm looking for something along the lines of Post.instances.all
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Ruby | Numeric dup() function The dup() is an inbuilt method in Ruby returns the number itself. Syntax: num1.dup() Parameters: The function needs a number. Return Value: It returns itself only.
Use #is_a? to Determine the Instance's Class Name in Ruby If the object given is an instance of a class , it returns true ; otherwise, it returns false .
Class Instances and Instance Methods In Ruby, a class is an object that defines a blueprint to create other objects. Classes define which methods are available on any instance of that class. Defining a method inside a class creates an instance method on that class.
Ruby uses the super keyword to call the superclass implementation of the current method. Within the body of a method, calls to super acts just like a call to that original method. The search for a method body starts in the superclass of the object that was found to contain the original method.
You can use ObjectSpace to retrieve all instantiated objects of a given class:
posts = []
ObjectSpace.each_object Post do |post|
posts << post
end
This is almost certainly a bad idea, though - for example, it will also load Post instances that are still in memory from earlier requests that haven't been garbage-collected. There's probably a much better way to get at the posts you care about, but we'll need more information about what you're trying to do.
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