fix: update post cache clearing logic to call helper function

regression from 8cf9617630

src/api/posts.js

@@ -239,7 +239,7 @@ postsAPI.purge = async function (caller, data) {
 	if (!canPurge) {
 		throw new Error('[[error:no-privileges]]');
 	}
-	require('../posts/cache').del(data.pid);
+	posts.clearCachedPost(data.pid);
 	await Promise.all([
 		posts.purge(data.pid, caller.uid),
 		require('.').activitypub.delete.note(caller, { pid: data.pid }),

src/posts/edit.js

@@ -15,9 +15,7 @@ const slugify = require('../slugify');
 const translator = require('../translator');
 
 module.exports = function (Posts) {
-	pubsub.on('post:edit', (pid) => {
-		require('./cache').del(pid);
-	});
+	pubsub.on('post:edit', pid => Posts.clearCachedPost(pid));
 
 	Posts.edit = async function (data) {
 		const { _activitypub } = data;
@@ -92,7 +90,7 @@ module.exports = function (Posts) {
 
 		plugins.hooks.fire('action:post.edit', { post: { ...returnPostData, _activitypub }, data: data, uid: data.uid });
 
-		require('./cache').del(String(postData.pid));
+		Posts.clearCachedPost(String(postData.pid));
 		pubsub.publish('post:edit', String(postData.pid));
 
 		await Posts.parsePost(returnPostData);

src/posts/tools.js

@@ -33,7 +33,7 @@ module.exports = function (Posts) {
 		}
 		let post;
 		if (isDelete) {
-			require('./cache').del(pid);
+			Posts.clearCachedPost(pid);
 			post = await Posts.delete(pid, uid);
 		} else {
 			post = await Posts.restore(pid, uid);