[Rails] Access block scope from AR object

[andreacfm]

I need to create a sort of transaction around some Active Record objects 
that perform many insert/updates.
Example:

class MyObject
    def transaction &block
        @my_var = value         
        self.instance_eval block 
    end
end

MyObject.new.transaction do
    Model.create
    Model.collection.create 
    etc......
end

I have a gem that add a method into AR::Base and I need to read the 
variables setted by the transaction inside the method at runtime.
Any way I can access the block scope from there inside?

Thanks

Andrea

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