TypeError: vrfCoordinatorV2Mock.addSubscription is not a function

[vaasanthk]

This error is caused by the following line. await vrfCoordinatorV2Mock.addSubscription(subscriptionId, raffle.address) . Please change it to await vrfCoordinatorV2Mock.addConsumer(subscriptionId, raffle.address)

[RamanSB]

What is the issue here? VRFCoordinatorV2Interface is implemented by VRFCoordinatorV2Mock, look at the interface do you see addSubscription as a function, I don't, but what I do see is createSubscription and addConsumer.

Now if we take a look at the VRFCoordinatorV2Mock contract I can see an implementation of where we override the following methods:

• createSubscription
• addConsumer

There is no addSubscription method, when you add your consumer (addConsumer) there is an additional parameter to specify your subscriptionId, that is what you would use if you want to add your Raffle as a consumer to the result generated by the VRFCoordinatorV2.

All you need to do is replace addSubscription with addConsumer and you should be good, I don't know where you are writing this code in the wider context so it may not work depending on the context.

[vaasanthk]

I apologize for not specifying the problem more explicitly. When I run the deploy script from the 01-deploy-raffle.js file after cloning the repository, this error appears, and when I run the test script, I get InvalidConsumer(). Upon researching the discussion group, I discovered that I should use addConsumer() instead of addSubscription(), which I thought might have been a mistake. Therefore, I created an issue ticket for this.

[RamanSB]

I believe addConsumer is correct, in my code I have used that method.

[PatrickAlphaC]

Thanks! Can you make a pull request to fix?

[YoexRep]

Thanks, i was having the same issue.