Indexing Bigmap Update
The @indexBigMapChange decorator can be used to mark an indexer method that will be listening for when a value in a bigmap stored with the contract changes.
When a bigmap change is detected on an indexed contract, the method will be invoked with detailed information about the change.
The following parameters will be passed to the indexing method:
Name | Description |
|---|---|
key | The changed key in the bigmap. The exact type will depend on the code of the contract. |
value | The new value (or null, if the item was removed). The exact type will depend on the code of the contract. |
dbContext | |
indexingContext |
The following code will print the value of the property
bar every time the contract's bigmap called foo is updated:interface FooValue {
bar: string;
}
export class MyContractIndexer {
@indexBigMapUpdate({ name: 'foo' })
async indexTokenLambdasUpdate(
key: string,
value: FooValue | undefined, // Undefined represents a removal.
dbContext: DbContext,
indexingContext: BigMapUpdateIndexingContext,
): Promise<void> {
console.log(value.bar);
}
}
Last modified 1yr ago