cafy 5.xに移行

src/cafy-id.ts

@@ -0,0 +1,29 @@
+import * as mongo from 'mongodb';
+import { Query } from 'cafy';
+
+export const isAnId = x => mongo.ObjectID.isValid(x);
+export const isNotAnId = x => !isAnId(x);
+
+/**
+ * ID
+ */
+export default class ID extends Query<mongo.ObjectID> {
+	constructor(...args) {
+		super(...args);
+
+		this.transform = v => {
+			if (isAnId(v) && !mongo.ObjectID.prototype.isPrototypeOf(v)) {
+				return new mongo.ObjectID(v);
+			} else {
+				return v;
+			}
+		};
+
+		this.pushFirstTimeValidator(v => {
+			if (!mongo.ObjectID.prototype.isPrototypeOf(v) && isNotAnId(v)) {
+				return new Error('must-be-an-id');
+			}
+			return true;
+		});
+	}
+}