从红宝石AWS instanceCollection对象获取instance_id数组

Question

I'm new to ruby (also to AWS) and trying to create and populate ELB after creating EC2 instances

instances = ec2.instances.create(...)

I now need an array of theirs ID I need something like this (in c# )

list<string> ids = new list<string>

    Foreach (instance in instances)
    {
      ids.add(instance.id);
    }
    string [] id_Array = ids.toarray();

what is the fastest way to do it in Ruby

Answer 1

You can call map on your instances collection to use the .id method to create an array of instance ids .

instances = ec2.instances.create(...)
ids = instances.map(&:id)

References:

AWS::EC2::Instance#id

Array#map

Hope this helps