Question 1

How to use ExConstructor with nested JSON data?

Accepted Answer

ExConstructor primarily handles flat key conversions; for nested data, you'll need to manually define structs for each level or use recursive functions, as it doesn't automatically instantiate nested structs. Check the documentation for advanced patterns, but it's not built-in.

Question 2

ExConstructor vs Ecto Changesets for ingesting external data?

Accepted Answer

ExConstructor is lighter and focuses solely on key format conversion for struct instantiation, while Ecto Changesets offer validation, casting, and database integration. Use ExConstructor for simple, quick struct creation from APIs; choose Ecto for full-featured data handling with validation.

Question 3

Does ExConstructor support custom key transformations beyond camelCase?

Accepted Answer

The README mentions automatic camelCase to snake_case conversion, but for other transformations like date formatting or custom mappings, you'd need to pre-process data or extend the library, as it's not customizable out of the box.

Question 4

How to add validation when using ExConstructor?

Accepted Answer

After instantiating a struct with ExConstructor, implement separate validation logic using Elixir's pattern matching, guards, or libraries like Ecto, since ExConstructor doesn't include validation features. This keeps concerns separated but adds extra steps.

Question 5

Is ExConstructor suitable for high-performance Elixir applications?

Accepted Answer

It adds minimal overhead through macros, but for ultra-high-performance scenarios where every microsecond counts, manual struct instantiation might be preferred to avoid any abstraction costs. Benchmarking is recommended for critical paths.

Question 6

Can ExConstructor work with Phoenix frameworks or LiveView?

Accepted Answer

Yes, it integrates seamlessly with Phoenix for handling API data or form inputs, as it's just an Elixir library. However, for LiveView, you might need to combine it with other tools for real-time validation or state management.

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