Expose the GraphQL schema somewhere

[simonw]

From this Twitter conversation I learned how to output a GraphQL schema: https://twitter.com/simonw/status/1292193658700144640

Example output here: https://gist.github.com/simonw/21b2f0878d4e4e20d514b8544b296393 - a snippet:

schema {
  query: Query
}

input IntegerOperations {
  eq: Int
  not: Int
  gt: Int
  gte: Int
  lt: Int
  lte: Int
  in: [Int]
  notin: [Int]
  arraycontains: Int
  isnull: Boolean
  notnull: Boolean
  isblank: Boolean
  notblank: Boolean
}

type PageInfo {
  endCursor: String
  hasNextPage: Boolean
}

type Query {
  users(filter: [usersFilter], where: String, first: Int, after: String, sort: usersSort, sort_desc: usersSortDesc, search: String): usersCollection
  users_get(id: Int, filter: [usersFilter], where: String, after: String, sort: usersSort, sort_desc: usersSortDesc, search: String): users
  repos(filter: [reposFilter], where: String, first: Int, after: String, sort: reposSort, sort_desc: reposSortDesc, search: String): reposCollection
  repos_get(id: Int, filter: [reposFilter], where: String, after: String, sort: reposSort, sort_desc: reposSortDesc, search: String): repos
  licenses(filter: [licensesFilter], where: String, first: Int, after: String, sort: licensesSort, sort_desc: licensesSortDesc, search: String): licensesCollection

[simonw]

Here's partial code for outputting it:

from graphql import print_schema

    schema = await schema_for_database(datasette, database=database)

    if request.args.get("schema"):
        return Response.text(print_schema(schema))

[simonw]

According to graphql/graphql-spec#203 (comment) the internal standard file extension for these at Facebook is .graphql.

I'm going to use the URL to the database-specific endpoint with graphql on the end for this, e.g.

https://datasette-graphql-demo.datasette.io/graphql/github.graphql

[simonw]

Demo: https://datasette-graphql-demo.datasette.io/graphql/github.graphql