Build guide: zome functions and lifecycle callbacks #512
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…pages into feat/guide/app-structure
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Converting to draft cuz I discovered a code example that got left unwritten 😬 |
Co-authored-by: ThetaSinner <[email protected]> Co-authored-by: Eric Harris-Braun <[email protected]>
…ucture-zome-functions
pdaoust
commented
Jan 20, 2025
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| Here's an `init` callback that [links](/build/links-paths-and-anchors/) the [agent's ID](/build/identifiers/#agent) to the [DNA hash](/build/identifiers/#dna) as a sort of "I'm here" note. (It depends on a couple things being defined in your integrity zome; we'll show the integrity zome after this sample for completeness.) | ||
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| ```rust |
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I struggled to find a meaningful init callback example; this is about as minimal as I can think of for the "link agent ID to well-known hash" use case.
pdaoust
commented
Jan 20, 2025
| // You don't need to tell Holochain about it with the `hdk_entry_types` macro, | ||
| // because it never gets stored -- we only use it to calculate a hash. | ||
| #[hdk_entry_helper] | ||
| pub struct Anchor(pub Vec<u8>); |
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I'm trying to avoid paths and anchors here, to reduce complexity, but maybe they're not as complex as all that. I'll go check the API and consider it.
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Two pages here, with some cleanup/extra examples on the CRUD pages now that we've described the call-zome lifecycle and relaxed chain top ordering in detail. Depends on #511 and shouldn't be merged until that one is merged.