Generate FieldValidationInstrumentation

graphql-java has recently implemented field level validation that is tested after the query is parsed, but before it is executed. https://github.com/graphql-java/graphql-java/issues/162

It would be really handy if this could be automatically generated using javax.validation annotations!

I’m only just starting my own implementation so I haven’t thought it through fully, but I can see it working as follows:

1. In the method that generates a GraphQLSchema, also generate a FieldValidationInstrumentation
2. This generate would, for each GraphQL query or mutation, check the arguments
3. For each argument and fields of each argument get any javax.validation annotations
4. Create a rule for each annotation. Add each rule to a SimpleFieldValidation
5. The programmer could then add the FieldValidationInstrumentation to the GraphQL builder GraphQL.newGraphQL(...).instrumentation(instrumentation).build()

It would also be nice to have a custom org.springframework.validation.Validator bean that could check business logic (e.g. the email already exists in the database) but I haven’t thought about how that could be implemented yet.

There’s an example of the graphql-java validation in the method fieldValidation(), Line 161, shows an example.

https://github.com/graphql-java/graphql-java/blob/2f8f3de1d722ec0128b960c5e565405057fa76ff/src/test/groovy/readme/InstrumentationExamples.java#L161

[kdotzenrod517]

Sorry if this is an old thread…I’m using JavaX validation constraints in my Spring app, how should I get SPQR to pick these up? Currently I have the below Object and am trying to validate this in my Graph query:

public class Example {
    @NotBlank
    @Pattern(regexp = ".{3,}")
    private String query;
}

  @GraphQLQuery(name = "exampleSearch")
  public List<String> searchList(@GraphQLArgument(name = "query") @RequestBody @Valid Example query) {
    return searchService.exampleSearch(query);
  }

[kaqqao]

@Matthias-Walter-Innio Answered your SO question as well.