docs: update INVOCATION_API.md

Add blurb about `WithMetadata` and `WithBoard` mixins.
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psychedelicious 2024-03-12 19:58:31 +11:00
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@ -22,6 +22,24 @@ class MyInvocation(BaseInvocation):
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```
The full API is documented below.
## Invocation Mixins
Two important mixins are provided to facilitate working with metadata and gallery boards.
### `WithMetadata`
Inherit from this class (in addition to `BaseInvocation`) to add a `metadata` input to your node. When you do this, you can access the metadata dict from `self.metadata` in the `invoke()` function.
The dict will be populated via the node's input, and you can add any metadata you'd like to it. When you call `context.images.save()`, if the metadata dict has any data, it be automatically embedded in the image.
### `WithBoard`
Inherit from this class (in addition to `BaseInvocation`) to add a `board` input to your node. This renders as a drop-down to select a board. The user's selection will be accessible from `self.board` in the `invoke()` function.
When you call `context.images.save()`, if a board was selected, the image will added to that board as it is saved.
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::: invokeai.app.services.shared.invocation_context.InvocationContext
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