NoMethodError results from calling a non-Prawn method inside group block

[serra-allgood]

This particular use case involves a class inheriting from Prawn::Document. Because prawn-grouping creates a shallow copy of the document to test if the block spills over to a new context, the subclass's methods are not available in the group block, resulting in a NoMethodError if they're called inside of it.

[serra-allgood]

The solution for this issue is to use the Prawn::Document.extensions API as much as possible. In my own use case, I was able to extract much of the subclass to a module that's loaded with Prawn::Document.extensions << MyModule inside an initializer for my Rails project. Due to the particularities of my use case, I still needed the subclass to inherit from Prawn::Document, but the group block no longer gets upset about those custom methods.

[ddengler]

@corwinkelly Thanks for the update on this.