Extending a GraphQL Filter Definition

Question

I have extended my graphql schema to add a totals resolver, but I can't seem to extend the filter to filter on this field. I can't figure out what can be wrong as it seems very simple, so maybe it's not supported? I am using Postgraphile with the makeExtendSchemaPlugin, but I believe the question is basic graphql syntax.

return {
  typeDefs: gql`
    extend type Note {
      lines: Int
    }
    extend type NoteFilter {
      lines: IntFilter
    }
  `,
  resolvers: {
    Note: {
      resolve: async(parent, args, ctx, info) => {
        // logic here
        return parent['@lines'].data.length;
      }
    }
  }
}

This seems so simple. The count resolver works, and gives me how many lines are in the note, yet I am not able to filter on it. I don't want to put the filter logic in the lines property itself. If I define a new query and give it a NoteFilter, the filter exists but doesn't include my extended property (lines). Anyone know what I'm doing wrong? This is the end goal I would like for a query:

gql`
  {
    allNotes(filter: {
      lines: {
        greaterThan: 10
      }
    }) {
      id
      lines
      line {
        content   
      }
    }
  }
`

Answer 1

If you are extending an input object type, the correct syntax is:

extend input NoteFilter {
  lines: IntFilter
}

In SDL, input object types are denoted as input, not type.