User blocking (Following part) (#3035)

* block wip

* UndoBlock

* UnBlock

* wip

* follow

* UI

* fix

src/models/blocking.ts

@@ -0,0 +1,41 @@
+import * as mongo from 'mongodb';
+import db from '../db/mongodb';
+import isObjectId from '../misc/is-objectid';
+
+const Blocking = db.get<IBlocking>('blocking');
+Blocking.createIndex(['blockerId', 'blockeeId'], { unique: true });
+export default Blocking;
+
+export type IBlocking = {
+	_id: mongo.ObjectID;
+	createdAt: Date;
+	blockeeId: mongo.ObjectID;
+	blockerId: mongo.ObjectID;
+};
+
+/**
+ * Blockingを物理削除します
+ */
+export async function deleteBlocking(blocking: string | mongo.ObjectID | IBlocking) {
+	let f: IBlocking;
+
+	// Populate
+	if (isObjectId(blocking)) {
+		f = await Blocking.findOne({
+			_id: blocking
+		});
+	} else if (typeof blocking === 'string') {
+		f = await Blocking.findOne({
+			_id: new mongo.ObjectID(blocking)
+		});
+	} else {
+		f = blocking as IBlocking;
+	}
+
+	if (f == null) return;
+
+	// このBlockingを削除
+	await Blocking.remove({
+		_id: f._id
+	});
+}