Custom arguments on tables

[simonw]

Relates to #16. How about if you could define custom arguments on tables which worked something like this:

trees(radius: {"lat": 37.78, "lng": -122.43, "km": 10}) {
  nodes {
    id
    name
  }
}

The radius here would be a custom argument defined in the plugin configuration.

Maybe it can be defined in terms of the where SQL clauses it adds?

[simonw]

Syntax something like:

plugins:
  datasette-graph-ql:
    databases:
      sf-trees:
        tables:
          arguments:
            radius:
              inputs:
                lat: float
                lng: float
                km: float
              where_sql: |-
                PtDistWithin(geometry, MakePoint(:lat ,:lng, 4326), :km * 1000)=TRUE

[simonw]

I think this is too similar to #16 - I'm going to solve this with custom queries instead, by making it so custom queries can state "I return the equivalent of an Entry" so nested GraphQL for foreign keys can work correctly.