Work on field query validation a bit

src/utils/has-fields.ts

@@ -0,0 +1,43 @@
+import database, { schemaInspector } from '../database';
+import { FIELD_SPECIAL_ALIAS_TYPES } from '../constants';
+import { uniq } from 'lodash';
+
+export default async function hasFields(fields: { collection: string; field: string }[]) {
+	const fieldsObject: { [collection: string]: string[] } = {};
+
+	fields.forEach(({ field, collection }) => {
+		if (fieldsObject.hasOwnProperty(collection) === false) {
+			fieldsObject[collection] = [];
+		}
+
+		fieldsObject[collection].push(field);
+	});
+
+	await Promise.all(
+		Object.entries(fieldsObject).map(([collection, fields]) =>
+			collectionHasFields(collection, fields)
+		)
+	);
+	return true;
+}
+
+export async function collectionHasFields(collection: string, fieldKeys: string[]) {
+	const [columns, fields] = await Promise.all([
+		schemaInspector.columns(collection),
+		database
+			.select('field')
+			.from('directus_fields')
+			.where({ collection })
+			.whereIn('field', fieldKeys)
+			.whereIn('special', FIELD_SPECIAL_ALIAS_TYPES),
+	]);
+
+	const existingFields = uniq([
+		...columns.map(({ column }) => column),
+		...fields.map(({ field }) => field),
+	]);
+
+	for (const key of fieldKeys) {
+		if (existingFields.includes(key) === false) throw new Error(key);
+	}
+}