Question 1

How to handle XML namespaces with HappyMapper?

Accepted Answer

Use the `namespace` method at the class level or specify `namespace: 'prefix'` on individual elements. For multiple namespaces, register them with `register_namespace` and define mappings accordingly, as shown in the address example.

Question 2

HappyMapper vs Nokogiri direct parsing: which is better?

Accepted Answer

HappyMapper is better for structured object mapping when you have a fixed XML schema and want clean Ruby objects. For raw XML manipulation or performance-critical tasks, direct Nokogiri parsing might be more efficient.

Question 3

How to parse large XML files without memory issues?

Accepted Answer

Use the `:in_groups_of` parameter in the parse method to process XML in chunks. For example, `Address.parse(large_xml, in_groups_of: 5)` processes five addresses at a time, as described in the large datasets section.

Question 4

Can HappyMapper map XML attributes to Ruby objects?

Accepted Answer

Yes, use the `attribute` declaration similar to `element`. For attributes on empty elements, you can use the `attributes` option in element definitions, as shown in the atom feed example.

Question 5

How to save a Ruby object back to XML using HappyMapper?

Accepted Answer

Call `#to_xml` on the mapped object. Customize output with options like `:on_save` lambdas for formatting and `:state_when_nil` to control element inclusion, detailed in the saving to XML section.

Question 6

Is HappyMapper still maintained since it's a fork?

Accepted Answer

Yes, it's actively maintained as the 'nokogiri-happymapper' gem, with updates and fixes indicated by GitHub badges and recent commits. The fork includes Nokogiri support and various improvements over the original.

HappyMapper

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