Tips for configuring GraphQL Apollo Server to interpret an empty string as null in a field registration

In dealing with a nullable field called 'language', I have observed that it is never actually null. It always contains either a locale code or an empty string ''. This has been causing complications on my client side as it expects only a locale code or nothing at all.

While I could address this issue on the client side or make changes in the database, my preference is to handle it within my GQL server.

One approach I am considering involves checking the data received in my datasources and making any necessary mutations. However, I am concerned about potential performance implications, particularly since this query is critical and I do not want to introduce unnecessary checks every time someone accesses a page on my website.

typescriptgraphqlapollo-server

Answer №1

To solve the issue, you need to create a specialized resolver for the specific field:

const newResolvers = {
  SpecificType: {
    category (data) => {
      return data.category || null
    }
  }
}

Answer №2

Specialized scalars and enums allow for individualized adjustments, such as validation or automatic conversion of input data (from "" to null).

FrameworkXYZ offers a robust system of hooks to handle these tasks.

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