Graphql-go: Error message missing value

[MrMatten]

I am actually not entirely sure this is the right place to post it, so let me know if it needs to go elsewhere.

I ran into a problem where I had

func (r *Resolver) ResolverName(args *struct {
    SomeVar SomeType
}) *ResolverNameResolver {

type SomeType struct {
    UserID int32
    SomeOtherVar int32
}

The mutation struct was

type LifeBalance {
    UserID: ID!
    SomeOtherVar: Int
}

I called ResolverName with

{
  "UserID": "2",
  "SomeVar": 4
}

And instead of getting something like UserID should be int instead of string
I got Error while fetching query: Error at path "ResolverName": missingValue

I kept looking for a missing value, so it took me a while to spot the difference in type.

[vetcher]

The problem is in UserID int32. By graphql spec ID is a string. Changing type to graphql.ID should fix your problem

Or change the schema to

type LifeBalance {
    UserID: Int!
    SomeOtherVar: Int
}

[MrMatten]

Didn't think the graphql.ID type was Postgres friendly, but if it translates to string I guess it is fine.
I will close this

[vetcher]

You should not use graphql.ID as your primary key in db. Just extract string from this type and use it as your wish (as uuid or convert to int, idk)

[MrMatten]

But then I still consider it a problem that the error message is confusing. If I provide an Int and it is supposed to be a String, I shouldn't get Missing Value as an error message

[vetcher]

yea, error messages are disgusting

[pavelnikolov]

Thanks for reporting. PRs are welcome for fixing this issue. I'll mark it as "Help wanted".