[Rails] Access block scope from AR object

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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