What is the Amplify backend best practice for adding calculated fields to GraphQL?
I am using Amplify's GraphQL backend, which works perfectly for generating standard CRUD operations.
However, what if I want to add a calculated field to the model?
For instance, I want to make a query that fetches a set of prices, and some of those prices are in my DynamoDB table, while others will come from an API call to a third party.
I can see two options from the Amplify docs:
- Modify the existing query resolver lambda pipeline, which entails writing a bunch of VTL boilerplate - exactly the kind of work I think Amplify is designed to automate
- Make the query with the @function directive, but then we don't get all the nice benefits of Amplify's generated pipeline, including auth and so on
Neither of these is ideal, or makes for a great developer experience. Let me know if you have a better way!
Thank you for reaching out to us
'@function' directive can be used in combination with field level authorization to get auth, the other components you would build yourself.
Is there a specific feature request you have in mind?
Apart from customizing resolvers we don't currently have a way to make something like this work.
I think we didn't realize that we could use field level authorization with @function.
We will try this for our use case and come back if we have any other questions.
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