Add `searchBy` helper & `SidebarItemEpicsSelect`

- Adds `searchBy` util in common utils
- Adds placeholder `SidebarItemEpicsSelect`

app/assets/javascripts/boards/components/board_sidebar.js

@@ -22,6 +22,8 @@ export default Vue.extend({
   components: {
     AssigneeTitle,
     Assignees,
+    SidebarEpicsSelect: () =>
+      import('ee_component/sidebar/components/sidebar_item_epics_select.vue'),
     RemoveBtn,
     Subscriptions,
     TimeTracker,

app/assets/javascripts/lib/utils/common_utils.js

@@ -731,6 +731,66 @@ export const NavigationType = {
   TYPE_RESERVED: 255,
 };
 
+/**
+ * Method to perform case-insensitive search for a string
+ * within multiple properties and return object containing
+ * properties in case there are multiple matches or `null`
+ * if there's no match.
+ *
+ * Eg; Suppose we want to allow user to search using for a string
+ *     within `iid`, `title`, `url` or `reference` props of a target object;
+ *
+ *     const objectToSearch = {
+ *       "iid": 1,
+ *       "title": "Error omnis quos consequatur ullam a vitae sed omnis libero cupiditate. &3",
+ *       "url": "/groups/gitlab-org/-/epics/1",
+ *       "reference": "&1",
+ *     };
+ *
+ *    Following is how we call searchBy and the return values it will yield;
+ *
+ *    -  `searchBy('omnis', objectToSearch);`: This will return `{ title: ... }` as our
+ *        query was found within title prop we only return that.
+ *    -  `searchBy('1', objectToSearch);`: This will return `{ "iid": ..., "reference": ..., "url": ... }`.
+ *    -  `searchBy('https://gitlab.com/groups/gitlab-org/-/epics/1', objectToSearch);`:
+ *        This will return `{ "url": ... }`.
+ *    -  `searchBy('foo', objectToSearch);`: This will return `null` as no property value
+ *        matched with our query.
+ *
+ *    You can learn more about behaviour of this method by referring to tests
+ *    within `spec/javascripts/lib/utils/common_utils_spec.js`.
+ *
+ * @param {string} query String to search for
+ * @param {object} searchSpace Object containing properties to search in for `query`
+ */
+export const searchBy = (query = '', searchSpace = {}) => {
+  const targetKeys = searchSpace !== null ? Object.keys(searchSpace) : [];
+
+  if (!query || !targetKeys.length) {
+    return null;
+  }
+
+  const normalizedQuery = query.toLowerCase();
+  const matches = targetKeys
+    .filter(item => {
+      const searchItem = `${searchSpace[item]}`.toLowerCase();
+
+      return (
+        searchItem.indexOf(normalizedQuery) > -1 ||
+        normalizedQuery.indexOf(searchItem) > -1 ||
+        normalizedQuery === searchItem
+      );
+    })
+    .reduce((acc, prop) => {
+      const match = acc;
+      match[prop] = searchSpace[prop];
+
+      return acc;
+    }, {});
+
+  return Object.keys(matches).length ? matches : null;
+};
+
 /**
  * Checks if the given Label has a special syntax `::` in
  * it's title.

doc/api/epics.md

@@ -65,6 +65,8 @@ Example response:
   "title": "Accusamus iste et ullam ratione voluptatem omnis debitis dolor est.",
   "description": "Molestias dolorem eos vitae expedita impedit necessitatibus quo voluptatum.",
   "state": "opened",
+  "web_edit_url": "http://localhost:3001/groups/test/-/epics/4",
+  "reference": "&4",
   "author": {
     "id": 10,
     "name": "Lu Mayer",
@@ -118,6 +120,8 @@ Example response:
   "title": "Ea cupiditate dolores ut vero consequatur quasi veniam voluptatem et non.",
   "description": "Molestias dolorem eos vitae expedita impedit necessitatibus quo voluptatum.",
   "state": "opened",
+  "web_edit_url": "http://localhost:3001/groups/test/-/epics/5",
+  "reference": "&5",
   "author":{
     "id": 7,
     "name": "Pamella Huel",
@@ -182,6 +186,8 @@ Example response:
   "title": "Epic",
   "description": "Epic description",
   "state": "opened",
+  "web_edit_url": "http://localhost:3001/groups/test/-/epics/6",
+  "reference": "&6",
   "author": {
     "name" : "Alexandra Bashirian",
     "avatar_url" : null,
@@ -247,6 +253,8 @@ Example response:
   "title": "New Title",
   "description": "Epic description",
   "state": "opened",
+  "web_edit_url": "http://localhost:3001/groups/test/-/epics/6",
+  "reference": "&6",
   "author": {
     "name" : "Alexandra Bashirian",
     "avatar_url" : null,

spec/javascripts/lib/utils/common_utils_spec.js

@@ -895,6 +895,45 @@ describe('common_utils', () => {
     });
   });
 
+  describe('searchBy', () => {
+    const searchSpace = {
+      iid: 1,
+      reference: '&1',
+      title: 'Error omnis quos consequatur ullam a vitae sed omnis libero cupiditate.',
+      url: '/groups/gitlab-org/-/epics/1',
+    };
+
+    it('returns null when `query` or `searchSpace` params are empty/undefined', () => {
+      expect(commonUtils.searchBy('omnis', null)).toBeNull();
+      expect(commonUtils.searchBy('', searchSpace)).toBeNull();
+      expect(commonUtils.searchBy()).toBeNull();
+    });
+
+    it('returns object with matching props based on `query` & `searchSpace` params', () => {
+      // String `omnis` is found only in `title` prop so return just that
+      expect(commonUtils.searchBy('omnis', searchSpace)).toEqual(
+        jasmine.objectContaining({
+          title: searchSpace.title,
+        }),
+      );
+
+      // String `1` is found in both `iid` and `reference` props so return both
+      expect(commonUtils.searchBy('1', searchSpace)).toEqual(
+        jasmine.objectContaining({
+          iid: searchSpace.iid,
+          reference: searchSpace.reference,
+        }),
+      );
+
+      // String `/epics/1` is found in `url` prop so return just that
+      expect(commonUtils.searchBy('/epics/1', searchSpace)).toEqual(
+        jasmine.objectContaining({
+          url: searchSpace.url,
+        }),
+      );
+    });
+  });
+
   describe('isScopedLabel', () => {
     it('returns true when `::` is present in title', () => {
       expect(commonUtils.isScopedLabel({ title: 'foo::bar' })).toBe(true);