From 3c4646bff6e8f527150d3d47cb76e11f032241cd Mon Sep 17 00:00:00 2001
From: Christian Cueni <christian.cueni@iterativ.ch>
Date: Thu, 18 Nov 2021 13:29:42 +0100
Subject: [PATCH] Delete ModuleNode caches on class change

---
 .../graphql/gql/local/mutations/deleteModuleNodes.gql  |  3 +++
 client/src/graphql/resolvers.js                        |  6 ++++++
 client/src/mixins/update-selected-class.js             | 10 ++++++++++
 3 files changed, 19 insertions(+)
 create mode 100644 client/src/graphql/gql/local/mutations/deleteModuleNodes.gql

diff --git a/client/src/graphql/gql/local/mutations/deleteModuleNodes.gql b/client/src/graphql/gql/local/mutations/deleteModuleNodes.gql
new file mode 100644
index 00000000..bc0c1939
--- /dev/null
+++ b/client/src/graphql/gql/local/mutations/deleteModuleNodes.gql
@@ -0,0 +1,3 @@
+mutation {
+  deleteModuleNodes @client
+}
diff --git a/client/src/graphql/resolvers.js b/client/src/graphql/resolvers.js
index 2d0c2620..8dafbd5a 100644
--- a/client/src/graphql/resolvers.js
+++ b/client/src/graphql/resolvers.js
@@ -34,5 +34,11 @@ export const resolvers = {
       cache.writeQuery({query: SIDEBAR, data});
       return data.sidebar;
     },
+    deleteModuleNodes: (_, _query, {cache}) => {
+      Object.keys(cache.data.data)
+        .filter(prop => prop.indexOf('ModuleNode:') === 0)
+        .map(moduleName => cache.data.delete(moduleName));  // v3 uses .evict{id, fieldname}
+      return {success: true}
+    },
   },
 };
diff --git a/client/src/mixins/update-selected-class.js b/client/src/mixins/update-selected-class.js
index 62b2bf7d..fc4a6b98 100644
--- a/client/src/mixins/update-selected-class.js
+++ b/client/src/mixins/update-selected-class.js
@@ -1,10 +1,12 @@
 import ME_QUERY from '@/graphql/gql/queries/meQuery.gql';
 import UPDATE_USER_SETTING from '@/graphql/gql/mutations/updateUserSetting.gql';
 import MY_SCHOOL_CLASS_QUERY from '@/graphql/gql/queries/mySchoolClass.gql';
+import DELETE_MODULE_NODES from '@/graphql/gql/local/mutations/deleteModuleNodes.gql';
 
 export default {
   methods: {
     updateSelectedClass(selectedClass) {
+      const innerApollo = this.$apollo;
       return this.$apollo.mutate({
         mutation: UPDATE_USER_SETTING,
         variables: {
@@ -18,6 +20,14 @@ export default {
           meData.me.selectedClass = selectedClass;
 
           store.writeQuery({query: ME_QUERY, data: meData});
+
+          innerApollo.mutate({
+            mutation: DELETE_MODULE_NODES,
+            variables: {
+              test: '',
+            }
+        })
+
         },
         refetchQueries: [{
           query: MY_SCHOOL_CLASS_QUERY