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FAQ
Common gotchas and how-tos
I try to run Hydra Indexer for my node but see Registry: ERROR: createType errors
Registry: ERROR: createType errorsThis error indicates that the indexer type definitions are not properly set. Hydra Indexer v3 takes the default types from
@polkadot/[email protected] which is compatible with runtimes built on Substrate 3.x but may cause errors when run against older versions of SubstrateMake sure that
- All the custom types are properly defined in the type definition json and the indexer has picked them up
How do I access extrinsic data in an event handler?
EventContext has an extrinsic field containing all the relevant extrinsic data if the event was emitted by an extrinsic. Further, one can create a type-safe extrinsic class using the constructor method generated by typegen.I want to bootstrap some external data not available via events or extrinsics
Export the data into a json file and load into the database via a one-off preBlockHook at the desired height. See mapping filters for more details.
How do I deal with runtime upgrades?
To inject some new data, define a one-off block hook triggered at the block height with the upgrade. In order to have different versions of event/extrinsic handlers for pre- and post- upgrade, use
specVersion filter.
Last modified 7mo ago