initial commit

app/Controllers/Http/Api/AuthorsController.ts

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+import type { HttpContextContract } from '@ioc:Adonis/Core/HttpContext';
+import Person from 'App/Models/Person';
+// import Dataset from 'App/Models/Dataset';
+
+// node ace make:controller Author
+export default class AuthorsController {
+
+	public async index({}: HttpContextContract) {        	
+	// select * from gba.persons
+	// where exists (select * from gba.documents inner join gba.link_documents_persons on "documents"."id" = "link_documents_persons"."document_id" 
+	// 			  where ("link_documents_persons"."role" = 'author') and ("persons"."id" = "link_documents_persons"."person_id"));
+		const authors =  await Person.query()
+		.whereHas('datasets', (dQuery) => {
+            dQuery.wherePivot('role', 'author')
+        })
+		.withCount('datasets', (query) => {
+			query.as('datasets_count')
+		  });
+        
+		return authors;
+	}
+
+}