hdkcrud

What is hdkcrud and what is it for?

hdkcrud is a Rust library for people building applications on Holochain. It generates a consistent set of create-read-update-delete functions, signalling, and time-based indexing and queries for an entry type defined in a zome, so a developer describes the entry once instead of writing every data operation by hand.

hdkcrud is a Rust library published by Lightning Rod Labs for developers building Holochain applications. It is distributed as a crate on crates.io, with documentation hosted on docs.rs, and it is meant to be used inside a zome rather than run as an application on its own.

Defining a data type in a Holochain application usually means writing each create, read, update and delete operation by hand. hdkcrud folds that work into a macro: the developer supplies the entry definition, and the library supplies the matching set of functions, along with signalling options and time-based indexing so records can be queried by when they were written.

The documented entry point is the crud macro, described in the crate's documentation as taking an entry definition to a full create-read-update-delete set of functionality in a zome, including signals (events) and time-based queries; that documentation points to a worked example. hAppRadar's census records this project's activity as stalled — the last push it observed was in December 2024 and the HDK requirement it recorded is an early release candidate — so the details here describe the repository as last seen rather than a current guarantee.

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