Replace OpenStruct with a lightweight Paddle::Object

[d34ndev]

OpenStruct is no longer a default gem, and it's slow to build because it defines singleton methods on every instance. Paddle responses are deeply nested, so every response created many OpenStructs.

This replaces it with a small Paddle::Object that stores attributes in a hash and reads them through method_missing.

What stays the same

• Dot access (obj.id), hash access (obj[:id], obj["id"]) and setters (obj.foo = )
• nil for missing attributes
• each_pair, respond_to?, == and the instance update method

What's new

• to_h now converts nested objects too, so it returns plain hashes all the way down
• to_json returns real JSON. Before, it returned an inspect string
• as_json, dig and key?
• Calling update on a model without an update method now raises NoMethodError rather than a confusing NameError
• The ostruct dependency has been removed

Performance

Benchmarked on a real transaction response from the test cassettes, Ruby 4.0.7, best of 5 runs:

Benchmark	OpenStruct	New	Speed-up
Build one transaction (2,000×)	901ms	46ms	19.5×
Build a 50-item page (50×)	1,711ms	62ms	27.8×
Build and read 5 fields (2,000×)	941ms	58ms	16.2×
Dot-access read (500k×)	30ms	150ms	0.2×
Hash-style read (500k×)	34ms	34ms	1.0×

Memory per transaction dropped from 134 KB to 6.8 KB, and allocations to build one went from 2,744 to 56. Dot-access reads are slower because they go through method_missing, but that's around 0.3µs per read.

Compatibility

Nested objects are now Paddle::Object rather than OpenStruct. Code that checks is_a?(OpenStruct) or uses OpenStruct-only methods, such as delete_field or to_h with a block, will break. A field named after a built-in public method, such as hash or class, now returns the method's result, so use obj[:hash] for those. This probably warrants a minor version bump and a changelog note.

Testing

Added 10 tests for the new object. The full suite passes (188 runs), and RuboCop is clean.

🤖 Generated with Claude Code