Returning custom value from rule

[dai4]

Question about GraphQL Shield

Is it possible to return a custom value when a rule fails? For example, I have:

type Entity {
  primaryImage: Image
  images: [Image]
}

const Permissions = {
  Entity: {
    primaryImage: isAllowed,
    images: isAllowed
  }
};

I would like the images to return [] rather than null.

[open-collective-bot]

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[maticzav]

@dai4 thank you for opening the issue. Currently, I hold a strong opinion of the effects in graphql-shield. One of the primary concerns while building it was making sure no data would lack due to mistakes to secure smooth sailing while developing the permission layer. Because of that, you cannot alter the return value of the business logic functions (i.e. the underlying function) using rules.

Despite my opinion, I see a growing number of requests for such functionality. I believe I'll introduce it with a rule named effect in the upcoming version of graphql-shield as it requires a complete rewrite of the core.