Simplify MR meta editor state management

Simplifies the data flow of the modal that
contains a form to edit the Merge Request
description and title in the Static Site Editor

app/assets/javascripts/static_site_editor/components/edit_meta_controls.vue

 <script>
 import { GlForm, GlFormGroup, GlFormInput, GlFormTextarea } from '@gitlab/ui';
-import AccessorUtilities from '~/lib/utils/accessor';
 
 export default {
   components: {
@@ -19,55 +18,25 @@ export default {
       required: true,
     },
   },
-  data() {
-    return {
-      editable: {
-        title: this.title,
-        description: this.description,
-      },
-    };
-  },
-  computed: {
-    editableStorageKey() {
-      return this.getId('local-storage', 'editable');
-    },
-    hasLocalStorage() {
-      return AccessorUtilities.isLocalStorageAccessSafe();
-    },
-  },
   mounted() {
-    this.initCachedEditable();
     this.preSelect();
   },
   methods: {
     getId(type, key) {
       return `sse-merge-request-meta-${type}-${key}`;
     },
-    initCachedEditable() {
-      if (this.hasLocalStorage) {
-        const cachedEditable = JSON.parse(localStorage.getItem(this.editableStorageKey));
-        if (cachedEditable) {
-          this.editable = cachedEditable;
-        }
-      }
-    },
     preSelect() {
       this.$nextTick(() => {
         this.$refs.title.$el.select();
       });
     },
-    resetCachedEditable() {
-      if (this.hasLocalStorage) {
-        window.localStorage.removeItem(this.editableStorageKey);
-      }
-    },
-    onUpdate() {
-      const payload = { ...this.editable };
+    onUpdate(field, value) {
+      const payload = {
+        title: this.title,
+        description: this.description,
+        [field]: value,
+      };
       this.$emit('updateSettings', payload);
-
-      if (this.hasLocalStorage) {
-        window.localStorage.setItem(this.editableStorageKey, JSON.stringify(payload));
-      }
     },
   },
 };
@@ -83,9 +52,9 @@ export default {
       <gl-form-input
         :id="getId('control', 'title')"
         ref="title"
-        v-model.lazy="editable.title"
+        :value="title"
         type="text"
-        @input="onUpdate"
+        @input="onUpdate('title', $event)"
       />
     </gl-form-group>
 
@@ -96,8 +65,8 @@ export default {
     >
       <gl-form-textarea
         :id="getId('control', 'description')"
-        v-model.lazy="editable.description"
-        @input="onUpdate"
+        :value="description"
+        @input="onUpdate('description', $event)"
       />
     </gl-form-group>
   </gl-form>

app/assets/javascripts/static_site_editor/components/edit_meta_modal.vue

 <script>
 import { GlModal } from '@gitlab/ui';
 import { __, s__, sprintf } from '~/locale';
+import LocalStorageSync from '~/vue_shared/components/local_storage_sync.vue';
 
 import EditMetaControls from './edit_meta_controls.vue';
 
+import { MR_META_LOCAL_STORAGE_KEY } from '../constants';
+
 export default {
   components: {
     GlModal,
     EditMetaControls,
+    LocalStorageSync,
   },
   props: {
     sourcePath: {
@@ -17,6 +21,7 @@ export default {
   },
   data() {
     return {
+      clearStorage: false,
       mergeRequestMeta: {
         title: sprintf(s__(`StaticSiteEditor|Update %{sourcePath} file`), {
           sourcePath: this.sourcePath,
@@ -51,7 +56,7 @@ export default {
     },
     onPrimary() {
       this.$emit('primary', this.mergeRequestMeta);
-      this.$refs.editMetaControls.resetCachedEditable();
+      this.clearStorage = true;
     },
     onSecondary() {
       this.hide();
@@ -60,6 +65,7 @@ export default {
       this.mergeRequestMeta = { ...mergeRequestMeta };
     },
   },
+  storageKey: MR_META_LOCAL_STORAGE_KEY,
 };
 </script>
 
@@ -75,6 +81,12 @@ export default {
     @secondary="onSecondary"
     @hide="() => $emit('hide')"
   >
+    <local-storage-sync
+      v-model="mergeRequestMeta"
+      :storage-key="$options.storageKey"
+      :clear="clearStorage"
+      as-json
+    />
     <edit-meta-controls
       ref="editMetaControls"
       :title="mergeRequestMeta.title"

app/assets/javascripts/static_site_editor/constants.js

@@ -21,3 +21,5 @@ export const TRACKING_ACTION_CREATE_MERGE_REQUEST = 'create_merge_request';
 export const TRACKING_ACTION_INITIALIZE_EDITOR = 'initialize_editor';
 
 export const DEFAULT_IMAGE_UPLOAD_PATH = 'source/images/uploads/';
+
+export const MR_META_LOCAL_STORAGE_KEY = 'sse-merge-request-meta-storage-key';

app/assets/javascripts/vue_shared/components/local_storage_sync.vue

@@ -22,11 +22,21 @@ export default {
       required: false,
       default: true,
     },
+    clear: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
   },
   watch: {
     value(newVal) {
       this.saveValue(this.serialize(newVal));
     },
+    clear(newVal) {
+      if (newVal) {
+        localStorage.removeItem(this.storageKey);
+      }
+    },
   },
   mounted() {
     // On mount, trigger update if we actually have a localStorageValue

spec/frontend/static_site_editor/components/edit_meta_controls_spec.js

 import { shallowMount } from '@vue/test-utils';
 
-import { useLocalStorageSpy } from 'helpers/local_storage_helper';
 import { GlFormInput, GlFormTextarea } from '@gitlab/ui';
 
 import EditMetaControls from '~/static_site_editor/components/edit_meta_controls.vue';
@@ -8,8 +7,6 @@ import EditMetaControls from '~/static_site_editor/components/edit_meta_controls
 import { mergeRequestMeta } from '../mock_data';
 
 describe('~/static_site_editor/components/edit_meta_controls.vue', () => {
-  useLocalStorageSpy();
-
   let wrapper;
   let mockSelect;
   let mockGlFormInputTitleInstance;
@@ -86,14 +83,5 @@ describe('~/static_site_editor/components/edit_meta_controls.vue', () => {
 
       expect(wrapper.emitted('updateSettings')[0][0]).toMatchObject(newSettings);
     });
-
-    it('should remember the input changes', () => {
-      findGlFormInputTitle().vm.$emit('input', newTitle);
-      findGlFormTextAreaDescription().vm.$emit('input', newDescription);
-
-      const newSettings = { title: newTitle, description: newDescription };
-
-      expect(localStorage.setItem).toHaveBeenCalledWith(storageKey, JSON.stringify(newSettings));
-    });
   });
 });

spec/frontend/static_site_editor/components/edit_meta_modal_spec.js

 import { shallowMount } from '@vue/test-utils';
-
 import { GlModal } from '@gitlab/ui';
-
+import { useLocalStorageSpy } from 'helpers/local_storage_helper';
+import LocalStorageSync from '~/vue_shared/components/local_storage_sync.vue';
 import EditMetaModal from '~/static_site_editor/components/edit_meta_modal.vue';
 import EditMetaControls from '~/static_site_editor/components/edit_meta_controls.vue';
-
+import { MR_META_LOCAL_STORAGE_KEY } from '~/static_site_editor/constants';
 import { sourcePath, mergeRequestMeta } from '../mock_data';
 
 describe('~/static_site_editor/components/edit_meta_modal.vue', () => {
+  useLocalStorageSpy();
+
   let wrapper;
   let resetCachedEditable;
   let mockEditMetaControlsInstance;
@@ -30,6 +32,11 @@ describe('~/static_site_editor/components/edit_meta_modal.vue', () => {
 
   const findGlModal = () => wrapper.find(GlModal);
   const findEditMetaControls = () => wrapper.find(EditMetaControls);
+  const findLocalStorageSync = () => wrapper.find(LocalStorageSync);
+
+  beforeEach(() => {
+    localStorage.setItem(MR_META_LOCAL_STORAGE_KEY);
+  });
 
   beforeEach(() => {
     buildWrapper();
@@ -43,6 +50,16 @@ describe('~/static_site_editor/components/edit_meta_modal.vue', () => {
     wrapper = null;
   });
 
+  it('initializes initial merge request meta with local storage data', async () => {
+    const localStorageMeta = { title: 'stored title', description: 'stored description' };
+
+    findLocalStorageSync().vm.$emit('input', localStorageMeta);
+
+    await wrapper.vm.$nextTick();
+
+    expect(findEditMetaControls().props()).toEqual(localStorageMeta);
+  });
+
   it('renders the modal', () => {
     expect(findGlModal().exists()).toBe(true);
   });
@@ -63,18 +80,32 @@ describe('~/static_site_editor/components/edit_meta_modal.vue', () => {
     expect(findEditMetaControls().props('description')).toBe(description);
   });
 
-  it('emits the primary event with mergeRequestMeta', () => {
-    findGlModal().vm.$emit('primary', mergeRequestMeta);
-    expect(wrapper.emitted('primary')).toEqual([[mergeRequestMeta]]);
-  });
+  describe('when save button is clicked', () => {
+    beforeEach(() => {
+      findGlModal().vm.$emit('primary', mergeRequestMeta);
+    });
 
-  it('calls resetCachedEditable on EditMetaControls when primary emits', () => {
-    findGlModal().vm.$emit('primary', mergeRequestMeta);
-    expect(mockEditMetaControlsInstance.resetCachedEditable).toHaveBeenCalled();
+    it('removes merge request meta from local storage', () => {
+      expect(findLocalStorageSync().props().clear).toBe(true);
+    });
+
+    it('emits the primary event with mergeRequestMeta', () => {
+      expect(wrapper.emitted('primary')).toEqual([[mergeRequestMeta]]);
+    });
   });
 
   it('emits the hide event', () => {
     findGlModal().vm.$emit('hide');
     expect(wrapper.emitted('hide')).toEqual([[]]);
   });
+
+  it('stores merge request meta changes in local storage when changes happen', async () => {
+    const newMeta = { title: 'new title', description: 'new description' };
+
+    findEditMetaControls().vm.$emit('updateSettings', newMeta);
+
+    await wrapper.vm.$nextTick();
+
+    expect(findLocalStorageSync().props('value')).toEqual(newMeta);
+  });
 });

spec/frontend/vue_shared/components/local_storage_sync_spec.js

@@ -239,4 +239,30 @@ describe('Local Storage Sync', () => {
       });
     });
   });
+
+  it('clears localStorage when clear property is true', async () => {
+    const storageKey = 'key';
+    const value = 'initial';
+
+    createComponent({
+      props: {
+        storageKey,
+      },
+    });
+    wrapper.setProps({
+      value,
+    });
+
+    await wrapper.vm.$nextTick();
+
+    expect(localStorage.getItem(storageKey)).toBe(value);
+
+    wrapper.setProps({
+      clear: true,
+    });
+
+    await wrapper.vm.$nextTick();
+
+    expect(localStorage.getItem(storageKey)).toBe(null);
+  });
 });