Flow•2y ago

joshua | Flow (2024-05-06)

I updated to the latest preview of flow-go-sdk, cadence, and emulator and I am getting this error in my Go tests now:

./nft_test_helpers.go:37:19: evt.Value.Fields undefined (type cadence.Event has no field or method Fields)

./nft_test_helpers.go:37:19: evt.Value.Fields undefined (type cadence.Event has no field or method Fields)

This is my code:

type Withdrawn struct {
    nftType      string
    id           uint64
    uuid         uint64
    from         string
    providerUuid uint64
}

type WithdrawnEvent flow.Event

func (evt WithdrawnEvent) NftType() cadence.String {
    return evt.Value.Fields[0].(cadence.String)
}

type Withdrawn struct {
    nftType      string
    id           uint64
    uuid         uint64
    from         string
    providerUuid uint64
}

type WithdrawnEvent flow.Event

func (evt WithdrawnEvent) NftType() cadence.String {
    return evt.Value.Fields[0].(cadence.String)
}

I checked the cadence value code for events and tried

fields

fields

, and

getFieldValues()

getFieldValues()

but those aren't found either.

    github.com/onflow/cadence v1.0.0-preview.25
    github.com/onflow/flow-emulator v1.0.0-preview.22
    github.com/onflow/flow-go-sdk v1.0.0-preview.25

    github.com/onflow/cadence v1.0.0-preview.25
    github.com/onflow/flow-emulator v1.0.0-preview.22
    github.com/onflow/flow-go-sdk v1.0.0-preview.25

Any idea what I should be using there to get a field from an event?

Needle•5/6/24, 4:18 PM

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If this is a technical question that others may benefit from, considering also asking it on Stackoverflow: https://stackoverflow.com/questions/ask?tags=onflow-cadence

turbolent•5/6/24, 4:24 PM

This is one of the Go API breaking changes in one of the last releases: https://github.com/onflow/cadence/releases/tag/v1.0.0-preview.24. As discussed in the office hours, we'll need to document this better

joshuaOP•5/6/24, 4:38 PM

So what do I change it to in order to access it? It looks like the things in the events section of values.go didn't work

turbolent•5/6/24, 5:04 PM

I'm working on writing this up, I'll ping you once it's done

turbolent•5/6/24, 5:20 PM

@joshua | Flow see https://www.notion.so/flowfoundation/Cadence-Forum-Post-Update-3d1ed5be20684c1dacecc1392ae4ffe4?pvs=4#63212bd012474eafba216a166d04e2f0 for the draft of what is going to get published soon. please leave feedback

turbolent•5/6/24, 8:16 PM

@joshua | Flow Thanks for the feedback! Could you please have another look? If the examples look OK, I'll post