fix: proposal to keep before.find sync

Author: vparpoil

README.md

@@ -195,7 +195,9 @@ test.before.find(function (userId, selector, options) {
 });
 ```
 
-__Important:__ This hook does not get called for `after.update` hooks (see https://github.com/Meteor-Community-Packages/meteor-collection-hooks/pull/297).
+__Important:__ 
+- The function used as `before.find` hook cannot be async
+- This hook does not get called for `after.update` hooks (see https://github.com/Meteor-Community-Packages/meteor-collection-hooks/pull/297).
 
 --------------------------------------------------------------------------------
 

find.js

@@ -17,6 +17,8 @@ CollectionHooks.defineWrapper('find', function (userId, _super, instance, hooks,
   hooks.before.forEach(hook => {
     if (!hook.hook.constructor.name.includes('Async')) {
       hook.hook.call(this, userId, selector, options)
+    } else {
+      throw new Error('Cannot use async function as before.find hook')
     }
   })
 
@@ -27,13 +29,7 @@ CollectionHooks.defineWrapper('find', function (userId, _super, instance, hooks,
     if (cursor[method]) {
       const originalMethod = cursor[method]
       cursor[method] = async function (...args) {
-        // Apply asynchronous before hooks
-        for (const hook of hooks.before) {
-          if (hook.hook.constructor.name.includes('Async')) {
-            await hook.hook.call(this, userId, selector, options)
-          }
-        }
-
+        // Do not try to apply asynchronous before hooks here because they act on the cursor which is already defined
         const result = await originalMethod.apply(this, args)
 
         // Apply after hooks

tests/find.js

@@ -6,8 +6,9 @@ Tinytest.addAsync('find - selector should be {} when called without arguments',
   const collection = new Mongo.Collection(null)
 
   let findSelector = null
-  collection.before.find(async function (userId, selector, options) {
+  collection.before.find(function (userId, selector, options) {
     findSelector = selector
+    return true
   })
 
   // hooks won't be triggered on find() alone, we must call fetchAsync()

tests/find_after_hooks.js

@@ -53,7 +53,7 @@ Tinytest.addAsync('issue #296 - after insert hook always finds all inserted', as
   test.equal(afterCalled, true)
 })
 
-Tinytest.addAsync('async find hook - after insert hook always finds all inserted', async function (test, next) {
+Tinytest.addAsync('find hook - after insert hook always finds all inserted', async function (test, next) {
   const collection = new Mongo.Collection(null)
 
   collection.before.find((userId, selector) => {