grand-stack-starter | Simple starter project for GRANDstack full stack apps | GraphQL library

As noted in the docs

NOTE: Only use augmentSchema if you are working with an existing GraphQLSchema object. In most cases you should use makeAugmentedSchema which can construct the GraphQLSchema object from type definitions.

The error is occurring because you're attempting to use makeExecutableSchema to create your schema. The @relation and @cypher directives are used exclusively by neo4j-graphql. Since they're not actually defined as part of your schema, building your schema with makeExecutableSchema will result in an error just like using any other undefined directive.

You should just use makeAugmentedSchema instead:

Looks like there is something wrong with your package.json.

When you start the api I see this command:

You can use GraphQL Playground to inspect the GraphQL API (in the "Docs" tab):

to ensure the mutations you are calling have the correct name and arguments. From inspecting the schema, it looks like instead of AddUserReviews, you want AddPatientReviews?

The error is a Cypher syntax error. The query used in your @cypher directive on Ingredient.quantity in your GraphQL schema definition is incorrect, it is referring to a variable q that has not been defined. Since quantity is a property on the Contains relationship and your query is binding c to that relationship your @cypher directive query should be