Add support for fetch Roadmap epics via GraphQL

Fetches epics in Roadmap via Graph query including
support for filters.

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

@@ -177,6 +177,15 @@ export const urlParamsToArray = (path = '') =>
 
 export const getUrlParamsArray = () => urlParamsToArray(window.location.search);
 
+/**
+ * Accepts encoding string which includes query params being
+ * sent to URL.
+ *
+ * @param {string} path Query param string
+ *
+ * @returns {object} Query params object containing key-value pairs
+ *                   with both key and values decoded into plain string.
+ */
 export const urlParamsToObject = (path = '') =>
   splitPath(path).reduce((dataParam, filterParam) => {
     if (filterParam === '') {
@@ -185,6 +194,7 @@ export const urlParamsToObject = (path = '') =>
 
     const data = dataParam;
     let [key, value] = filterParam.split('=');
+    key = /%\w+/g.test(key) ? decodeURIComponent(key) : key;
     const isArray = key.includes('[]');
     key = key.replace('[]', '');
     value = decodeURIComponent(value.replace(/\+/g, ' '));

ee/app/assets/javascripts/roadmap/components/roadmap_app.vue

@@ -32,8 +32,16 @@ export default {
     },
   },
   data() {
+    const roadmapGraphQL = gon.features && gon.features.roadmapGraphql;
     return {
       handleResizeThrottled: {},
+      // TODO
+      // Remove these method alias and call actual
+      // method once feature flag is removed.
+      fetchEpicsFn: roadmapGraphQL ? this.fetchEpicsGQL : this.fetchEpics,
+      fetchEpicsForTimeframeFn: roadmapGraphQL
+        ? this.fetchEpicsForTimeframeGQL
+        : this.fetchEpicsForTimeframe,
     };
   },
   computed: {
@@ -78,7 +86,7 @@ export default {
     },
   },
   mounted() {
-    this.fetchEpics();
+    this.fetchEpicsFn();
     this.handleResizeThrottled = _.throttle(this.handleResize, 600);
     window.addEventListener('resize', this.handleResizeThrottled, false);
   },
@@ -89,7 +97,9 @@ export default {
     ...mapActions([
       'setWindowResizeInProgress',
       'fetchEpics',
+      'fetchEpicsGQL',
       'fetchEpicsForTimeframe',
+      'fetchEpicsForTimeframeGQL',
       'extendTimeframe',
       'refreshEpicDates',
     ]),
@@ -146,7 +156,7 @@ export default {
       this.refreshEpicDates();
 
       this.$nextTick(() => {
-        this.fetchEpicsForTimeframe({
+        this.fetchEpicsForTimeframeFn({
           timeframe: this.extendedTimeframe,
         })
           .then(() => {

ee/app/assets/javascripts/roadmap/queries/epicChildEpics.query.graphql

+query epicChildEpics(
+  $fullPath: ID!
+  $iid: ID!
+  $state: EpicState
+  $sort: EpicSort
+  $startDate: Time
+  $dueDate: Time
+) {
+  group(fullPath: $fullPath) {
+    id
+    name
+    epic(iid: $iid) {
+      id
+      title
+      children(state: $state, sort: $sort, startDate: $startDate, endDate: $dueDate) {
+        edges {
+          node {
+            id
+            title
+            state
+            webUrl
+            startDate
+            dueDate
+            group {
+              name
+              fullName
+            }
+          }
+        }
+      }
+    }
+  }
+}

ee/app/assets/javascripts/roadmap/queries/groupEpics.query.graphql

+query groupEpics(
+  $fullPath: ID!
+  $state: EpicState
+  $sort: EpicSort
+  $startDate: Time
+  $dueDate: Time
+  $labelName: [String!] = []
+  $authorUsername: String = ""
+  $search: String = ""
+) {
+  group(fullPath: $fullPath) {
+    id
+    name
+    epics(
+      state: $state
+      sort: $sort
+      startDate: $startDate
+      endDate: $dueDate
+      labelName: $labelName
+      authorUsername: $authorUsername
+      search: $search
+    ) {
+      edges {
+        node {
+          id
+          title
+          state
+          webUrl
+          startDate
+          dueDate
+          group {
+            name
+            fullName
+          }
+        }
+      }
+    }
+  }
+}

ee/app/assets/javascripts/roadmap/roadmap_bundle.js

@@ -3,12 +3,16 @@ import { mapActions } from 'vuex';
 
 import Translate from '~/vue_shared/translate';
 
-import { parseBoolean } from '~/lib/utils/common_utils';
+import {
+  parseBoolean,
+  urlParamsToObject,
+  convertObjectPropsToCamelCase,
+} from '~/lib/utils/common_utils';
 import { visitUrl, mergeUrlParams } from '~/lib/utils/url_utility';
 
 import { PRESET_TYPES, EPIC_DETAILS_CELL_WIDTH } from './constants';
 
-import { getTimeframeForPreset, getEpicsPathForPreset } from './utils/roadmap_utils';
+import { getEpicsPathForPreset, getTimeframeForPreset } from './utils/roadmap_utils';
 
 import createStore from './store';
 
@@ -48,6 +52,11 @@ export default () => {
           ? dataset.presetType
           : PRESET_TYPES.MONTHS;
       const filterQueryString = window.location.search.substring(1);
+      const filterParams = Object.assign(
+        convertObjectPropsToCamelCase(urlParamsToObject(filterQueryString), {
+          dropKeys: ['scope', 'utf8', 'state', 'sort', 'layout'], // These keys are unsupported/unnecessary
+        }),
+      );
       const timeframe = getTimeframeForPreset(
         presetType,
         window.innerWidth - el.offsetLeft - EPIC_DETAILS_CELL_WIDTH,
@@ -66,12 +75,15 @@ export default () => {
         defaultInnerHeight: Number(dataset.innerHeight),
         isChildEpics: parseBoolean(dataset.childEpics),
         currentGroupId: parseInt(dataset.groupId, 0),
+        basePath: dataset.epicsPath,
+        fullPath: dataset.fullPath,
+        epicIid: dataset.iid,
         newEpicEndpoint: dataset.newEpicEndpoint,
         epicsState: dataset.epicsState,
-        basePath: dataset.epicsPath,
         sortedBy: dataset.sortedBy,
         filterQueryString,
         initialEpicsPath,
+        filterParams,
         presetType,
         timeframe,
       };
@@ -79,11 +91,15 @@ export default () => {
     created() {
       this.setInitialData({
         currentGroupId: this.currentGroupId,
+        fullPath: this.fullPath,
+        epicIid: this.epicIid,
         sortedBy: this.sortedBy,
         presetType: this.presetType,
+        epicsState: this.epicsState,
         timeframe: this.timeframe,
         basePath: this.basePath,
         filterQueryString: this.filterQueryString,
+        filterParams: this.filterParams,
         initialEpicsPath: this.initialEpicsPath,
         defaultInnerHeight: this.defaultInnerHeight,
         isChildEpics: this.isChildEpics,

ee/app/assets/javascripts/roadmap/store/actions.js

@@ -3,9 +3,17 @@ import { s__ } from '~/locale';
 import axios from '~/lib/utils/axios_utils';
 
 import * as epicUtils from '../utils/epic_utils';
-import { getEpicsPathForPreset, sortEpics, extendTimeframeForPreset } from '../utils/roadmap_utils';
+import {
+  getEpicsPathForPreset,
+  getEpicsTimeframeRange,
+  sortEpics,
+  extendTimeframeForPreset,
+} from '../utils/roadmap_utils';
 import { EXTEND_AS } from '../constants';
 
+import groupEpics from '../queries/groupEpics.query.graphql';
+import epicChildEpics from '../queries/epicChildEpics.query.graphql';
+
 import * as types from './mutation_types';
 
 export const setInitialData = ({ commit }, data) => commit(types.SET_INITIAL_DATA, data);
@@ -13,6 +21,54 @@ export const setInitialData = ({ commit }, data) => commit(types.SET_INITIAL_DAT
 export const setWindowResizeInProgress = ({ commit }, inProgress) =>
   commit(types.SET_WINDOW_RESIZE_IN_PROGRESS, inProgress);
 
+export const fetchGroupEpics = (
+  { epicIid, fullPath, epicsState, sortedBy, presetType, filterParams, timeframe },
+  defaultTimeframe,
+) => {
+  let query;
+  let variables = {
+    fullPath,
+    state: epicsState,
+    sort: sortedBy,
+    ...getEpicsTimeframeRange({
+      presetType,
+      timeframe: defaultTimeframe || timeframe,
+    }),
+  };
+
+  // When epicIid is present,
+  // Roadmap is being accessed from within an Epic,
+  // and then we don't need to pass `filterParams`.
+  if (epicIid) {
+    query = epicChildEpics;
+    variables.iid = epicIid;
+  } else {
+    query = groupEpics;
+    variables = {
+      ...variables,
+      ...filterParams,
+    };
+  }
+
+  return epicUtils.gqClient
+    .query({
+      query,
+      variables,
+    })
+    .then(({ data }) => {
+      const { group } = data;
+      let edges;
+
+      if (epicIid) {
+        edges = (group.epic && group.epic.children.edges) || [];
+      } else {
+        edges = (group.epics && group.epics.edges) || [];
+      }
+
+      return epicUtils.extractGroupEpics(edges);
+    });
+};
+
 export const requestEpics = ({ commit }) => commit(types.REQUEST_EPICS);
 export const requestEpicsForTimeframe = ({ commit }) => commit(types.REQUEST_EPICS_FOR_TIMEFRAME);
 export const receiveEpicsSuccess = (
@@ -60,9 +116,17 @@ export const fetchEpics = ({ state, dispatch }) => {
     .then(({ data }) => {
       dispatch('receiveEpicsSuccess', { rawEpics: data });
     })
-    .catch(() => {
-      dispatch('receiveEpicsFailure');
-    });
+    .catch(() => dispatch('receiveEpicsFailure'));
+};
+
+export const fetchEpicsGQL = ({ state, dispatch }) => {
+  dispatch('requestEpics');
+
+  fetchGroupEpics(state)
+    .then(rawEpics => {
+      dispatch('receiveEpicsSuccess', { rawEpics });
+    })
+    .catch(() => dispatch('receiveEpicsFailure'));
 };
 
 export const fetchEpicsForTimeframe = ({ state, dispatch }, { timeframe }) => {
@@ -90,6 +154,20 @@ export const fetchEpicsForTimeframe = ({ state, dispatch }, { timeframe }) => {
     });
 };
 
+export const fetchEpicsForTimeframeGQL = ({ state, dispatch }, { timeframe }) => {
+  dispatch('requestEpicsForTimeframe');
+
+  return fetchGroupEpics(state, timeframe)
+    .then(rawEpics => {
+      dispatch('receiveEpicsSuccess', {
+        rawEpics,
+        newEpic: true,
+        timeframeExtended: true,
+      });
+    })
+    .catch(() => dispatch('receiveEpicsFailure'));
+};
+
 export const extendTimeframe = ({ commit, state, getters }, { extendAs }) => {
   const isExtendTypePrepend = extendAs === EXTEND_AS.PREPEND;
 

ee/app/assets/javascripts/roadmap/store/state.js

@@ -4,11 +4,14 @@ export default () => ({
   epicsState: '',
   filterQueryString: '',
   initialEpicsPath: '',
+  filterParams: null,
 
   // Data
+  epicIid: '',
   epics: [],
   epicIds: [],
   currentGroupId: -1,
+  fullPath: '',
   timeframe: [],
   extendedTimeframe: [],
   presetType: '',

ee/app/assets/javascripts/roadmap/utils/epic_utils.js

 import { convertObjectPropsToCamelCase } from '~/lib/utils/common_utils';
 import { newDate, parsePikadayDate } from '~/lib/utils/datetime_utility';
+import createGqClient from '~/lib/graphql';
+
+export const gqClient = createGqClient();
 
 /**
  * Updates provided `epic` object with necessary props
@@ -71,10 +74,12 @@ export const processEpicDates = (epic, timeframeStartDate, timeframeEndDate) =>
  */
 export const formatEpicDetails = (rawEpic, timeframeStartDate, timeframeEndDate) => {
   const epicItem = convertObjectPropsToCamelCase(rawEpic);
+  const rawStartDate = rawEpic.start_date || rawEpic.startDate;
+  const rawEndDate = rawEpic.end_date || rawEpic.dueDate;
 
-  if (rawEpic.start_date) {
+  if (rawStartDate) {
     // If startDate is present
-    const startDate = parsePikadayDate(rawEpic.start_date);
+    const startDate = parsePikadayDate(rawStartDate);
     epicItem.startDate = startDate;
     epicItem.originalStartDate = startDate;
   } else {
@@ -82,9 +87,9 @@ export const formatEpicDetails = (rawEpic, timeframeStartDate, timeframeEndDate)
     epicItem.startDateUndefined = true;
   }
 
-  if (rawEpic.end_date) {
+  if (rawEndDate) {
     // If endDate is present
-    const endDate = parsePikadayDate(rawEpic.end_date);
+    const endDate = parsePikadayDate(rawEndDate);
     epicItem.endDate = endDate;
     epicItem.originalEndDate = endDate;
   } else {
@@ -96,3 +101,19 @@ export const formatEpicDetails = (rawEpic, timeframeStartDate, timeframeEndDate)
 
   return epicItem;
 };
+
+/**
+ * Returns array of epics extracted from GraphQL response
+ * discarding the `edges`->`node` nesting
+ *
+ * @param {Object} group
+ */
+export const extractGroupEpics = edges =>
+  edges.map(({ node, epicNode = node }) => ({
+    ...epicNode,
+    // We can get rid of below two lines
+    // by updating `epic_item_details.vue`
+    // once we move to GraphQL permanently.
+    groupName: epicNode.group.name,
+    groupFullName: epicNode.group.fullName,
+  }));

ee/app/assets/javascripts/roadmap/utils/roadmap_utils.js

@@ -366,6 +366,46 @@ export const getTimeframeForPreset = (
   return timeframe;
 };
 
+/**
+ * Returns timeframe range in string based on provided config.
+ *
+ * @param {object} config
+ * @param {string} config.presetType String representing preset type
+ * @param {array} config.timeframe Array of dates representing timeframe
+ *
+ * @returns {object} Returns an object containing `startDate` & `dueDate` strings
+ *                   Computed using presetType and timeframe.
+ */
+export const getEpicsTimeframeRange = ({ presetType = '', timeframe = [] }) => {
+  let start;
+  let due;
+
+  const firstTimeframe = timeframe[0];
+  const lastTimeframe = timeframe[timeframe.length - 1];
+
+  // Compute start and end dates from timeframe
+  // based on provided presetType.
+  if (presetType === PRESET_TYPES.QUARTERS) {
+    [start] = firstTimeframe.range;
+    due = lastTimeframe.range[lastTimeframe.range.length - 1];
+  } else if (presetType === PRESET_TYPES.MONTHS) {
+    start = firstTimeframe;
+    due = lastTimeframe;
+  } else if (presetType === PRESET_TYPES.WEEKS) {
+    start = firstTimeframe;
+    due = newDate(lastTimeframe);
+    due.setDate(due.getDate() + 6);
+  }
+
+  const startDate = `${start.getFullYear()}-${start.getMonth() + 1}-${start.getDate()}`;
+  const dueDate = `${due.getFullYear()}-${due.getMonth() + 1}-${due.getDate()}`;
+
+  return {
+    startDate,
+    dueDate,
+  };
+};
+
 export const getEpicsPathForPreset = ({
   basePath = '',
   filterQueryString = '',
@@ -373,37 +413,19 @@ export const getEpicsPathForPreset = ({
   timeframe = [],
   epicsState = 'all',
 }) => {
-  let start;
-  let end;
   let epicsPath = basePath;
 
   if (!basePath || !timeframe.length) {
     return null;
   }
 
-  const firstTimeframe = timeframe[0];
-  const lastTimeframe = timeframe[timeframe.length - 1];
-
-  // Construct Epic API path to include
-  // `start_date` & `end_date` query params to get list of
-  // epics only for timeframe.
-  if (presetType === PRESET_TYPES.QUARTERS) {
-    [start] = firstTimeframe.range;
-    end = lastTimeframe.range[lastTimeframe.range.length - 1];
-  } else if (presetType === PRESET_TYPES.MONTHS) {
-    start = firstTimeframe;
-    end = lastTimeframe;
-  } else if (presetType === PRESET_TYPES.WEEKS) {
-    start = firstTimeframe;
-    end = newDate(lastTimeframe);
-    end.setDate(end.getDate() + 6);
-  }
+  const range = getEpicsTimeframeRange({
+    presetType,
+    timeframe,
+  });
 
   epicsPath += epicsPath.indexOf('?') === -1 ? '?' : '&';
-
-  const startDate = `${start.getFullYear()}-${start.getMonth() + 1}-${start.getDate()}`;
-  const endDate = `${end.getFullYear()}-${end.getMonth() + 1}-${end.getDate()}`;
-  epicsPath += `state=${epicsState}&start_date=${startDate}&end_date=${endDate}`;
+  epicsPath += `state=${epicsState}&start_date=${range.startDate}&end_date=${range.dueDate}`;
 
   if (filterQueryString) {
     epicsPath += `&${filterQueryString}`;

ee/app/controllers/groups/epics_controller.rb

@@ -17,6 +17,7 @@ class Groups::EpicsController < Groups::ApplicationController
 
   before_action do
     push_frontend_feature_flag(:epic_trees, @group)
+    push_frontend_feature_flag(:roadmap_graphql, @group)
   end
 
   def index

ee/app/controllers/groups/roadmap_controller.rb

@@ -8,6 +8,9 @@ module Groups
     before_action :check_epics_available!
     before_action :group
     before_action :persist_roadmap_layout, only: [:show]
+    before_action do
+      push_frontend_feature_flag(:roadmap_graphql, @group)
+    end
 
     # show roadmap for a group
     def show

ee/app/views/groups/epics/show.html.haml

@@ -39,6 +39,8 @@
         %section.col-md-12
           #js-roadmap{ data: { epics_path: group_epics_path(@group, parent_id: @epic.id, format: :json),
             group_id: @group.id,
+            iid: @epic.iid,
+            full_path: @group.full_path,
             empty_state_illustration: image_path('illustrations/epics/roadmap.svg'),
             has_filters_applied: 'false',
             new_epic_endpoint: group_epics_path(@group),
@@ -88,6 +90,8 @@
         %section.col-md-12
           #js-roadmap{ data: { epics_path: group_epics_path(@group, parent_id: @epic.id, format: :json),
             group_id: @group.id,
+            iid: @epic.iid,
+            full_path: @group.full_path,
             empty_state_illustration: image_path('illustrations/epics/roadmap.svg'),
             has_filters_applied: 'false',
             new_epic_endpoint: group_epics_path(@group),

ee/app/views/groups/roadmap/show.html.haml

@@ -9,6 +9,6 @@
 - if @epics_count != 0
   = render 'shared/epic/search_bar', type: :epics, show_roadmap_presets: true, hide_extra_sort_options: true
 
-  #js-roadmap{ data: { epics_path: group_epics_path(@group, format: :json), group_id: @group.id, empty_state_illustration: image_path('illustrations/epics/roadmap.svg'), has_filters_applied: "#{has_filters_applied}", new_epic_endpoint: group_epics_path(@group), preset_type: roadmap_layout, epics_state: @epics_state, sorted_by: @sort } }
+  #js-roadmap{ data: { epics_path: group_epics_path(@group, format: :json), group_id: @group.id, full_path: @group.full_path, empty_state_illustration: image_path('illustrations/epics/roadmap.svg'), has_filters_applied: "#{has_filters_applied}", new_epic_endpoint: group_epics_path(@group), preset_type: roadmap_layout, epics_state: @epics_state, sorted_by: @sort } }
 - else
   = render 'shared/empty_states/roadmap'

ee/spec/features/epics/epic_show_spec.rb

@@ -19,6 +19,7 @@ describe 'Epic show', :js do
   end
 
   let(:epic) { create(:epic, group: group, title: epic_title, description: markdown, author: user) }
+  let!(:not_child) { create(:epic, group: group, title: 'not child epic', description: markdown, author: user, start_date: 50.days.ago, end_date: 10.days.ago) }
   let!(:child_epic_a) { create(:epic, group: group, title: 'Child epic A', description: markdown, parent: epic, start_date: 50.days.ago, end_date: 10.days.ago) }
   let!(:child_epic_b) { create(:epic, group: group, title: 'Child epic B', description: markdown, parent: epic, start_date: 100.days.ago, end_date: 20.days.ago) }
 
@@ -85,6 +86,7 @@ describe 'Epic show', :js do
         expect(page).to have_selector('.roadmap-container .roadmap-shell')
 
         page.within('.roadmap-shell .epics-list-section') do
+          expect(page).not_to have_content(not_child.title)
           expect(find('.epics-list-item:nth-child(1) .epic-title a')).to have_content('Child epic B')
           expect(find('.epics-list-item:nth-child(2) .epic-title a')).to have_content('Child epic A')
         end

ee/spec/javascripts/roadmap/components/roadmap_app_spec.js

@@ -62,6 +62,46 @@ describe('Roadmap AppComponent', () => {
     it('returns default data props', () => {
       expect(vm.handleResizeThrottled).toBeDefined();
     });
+
+    describe('when `gon.feature.roadmapGraphql` is true', () => {
+      const originalGonFeatures = Object.assign({}, gon.features);
+
+      beforeAll(() => {
+        gon.features = { roadmapGraphql: true };
+      });
+
+      afterAll(() => {
+        gon.features = originalGonFeatures;
+      });
+
+      it('returns data prop containing `fetchEpicsFn` mapped to `fetchEpicsGQL`', () => {
+        expect(vm.fetchEpicsFn).toBe(vm.fetchEpicsGQL);
+      });
+
+      it('returns data prop containing `fetchEpicsForTimeframeFn` mapped to `fetchEpicsForTimeframeGQL`', () => {
+        expect(vm.fetchEpicsForTimeframeFn).toBe(vm.fetchEpicsForTimeframeGQL);
+      });
+    });
+
+    describe('when `gon.feature.roadmapGraphql` is false', () => {
+      const originalGonFeatures = Object.assign({}, gon.features);
+
+      beforeAll(() => {
+        gon.features = { roadmapGraphql: false };
+      });
+
+      afterAll(() => {
+        gon.features = originalGonFeatures;
+      });
+
+      it('returns data prop containing `fetchEpicsFn` mapped to `fetchEpics`', () => {
+        expect(vm.fetchEpicsFn).toBe(vm.fetchEpics);
+      });
+
+      it('returns data prop containing `fetchEpicsForTimeframeFn` mapped to `fetchEpicsForTimeframe`', () => {
+        expect(vm.fetchEpicsForTimeframeFn).toBe(vm.fetchEpicsForTimeframe);
+      });
+    });
   });
 
   describe('computed', () => {
@@ -192,7 +232,7 @@ describe('Roadmap AppComponent', () => {
       it('calls `fetchEpicsForTimeframe` with extended timeframe array', done => {
         spyOn(vm, 'extendTimeframe').and.stub();
         spyOn(vm, 'refreshEpicDates').and.stub();
-        spyOn(vm, 'fetchEpicsForTimeframe').and.callFake(() => new Promise(() => {}));
+        spyOn(vm, 'fetchEpicsForTimeframeFn').and.callFake(() => new Promise(() => {}));
 
         const extendType = EXTEND_AS.PREPEND;
 
@@ -200,7 +240,7 @@ describe('Roadmap AppComponent', () => {
 
         vm.$nextTick()
           .then(() => {
-            expect(vm.fetchEpicsForTimeframe).toHaveBeenCalledWith(
+            expect(vm.fetchEpicsForTimeframeFn).toHaveBeenCalledWith(
               jasmine.objectContaining({
                 timeframe: vm.extendedTimeframe,
               }),

ee/spec/javascripts/roadmap/mock_data.js

@@ -305,3 +305,58 @@ export const mockUnsortedEpics = [
     endDate: new Date(2015, 7, 15),
   },
 ];
+
+export const mockGroupEpicsQueryResponse = {
+  data: {
+    group: {
+      id: 'gid://gitlab/Group/2',
+      name: 'Gitlab Org',
+      epics: {
+        edges: [
+          {
+            node: {
+              id: 'gid://gitlab/Epic/40',
+              title: 'Marketing epic',
+              startDate: '2017-12-25',
+              dueDate: '2018-03-09',
+              webUrl: '/groups/gitlab-org/marketing/-/epics/1',
+              group: {
+                name: 'Gitlab Org',
+                fullName: 'Gitlab Org',
+              },
+            },
+          },
+          {
+            node: {
+              id: 'gid://gitlab/Epic/41',
+              title: 'Another marketing',
+              startDate: '2017-12-26',
+              dueDate: '2018-03-10',
+              webUrl: '/groups/gitlab-org/marketing/-/epics/2',
+              group: {
+                name: 'Gitlab Org',
+                fullName: 'Gitlab Org',
+              },
+            },
+          },
+        ],
+      },
+    },
+  },
+};
+
+export const mockEpicChildEpicsQueryResponse = {
+  data: {
+    group: {
+      id: 'gid://gitlab/Group/2',
+      name: 'Gitlab Org',
+      epic: {
+        id: 'gid://gitlab/Epic/1',
+        title: 'Error omnis quos consequatur',
+        children: {
+          edges: mockGroupEpicsQueryResponse.data.group.epics.edges,
+        },
+      },
+    },
+  },
+};

ee/spec/javascripts/roadmap/store/actions_spec.js

@@ -5,8 +5,10 @@ import * as types from 'ee/roadmap/store/mutation_types';
 
 import defaultState from 'ee/roadmap/store/state';
 import { getTimeframeForMonthsView } from 'ee/roadmap/utils/roadmap_utils';
-import { formatEpicDetails } from 'ee/roadmap/utils/epic_utils';
+import * as epicUtils from 'ee/roadmap/utils/epic_utils';
 import { PRESET_TYPES, EXTEND_AS } from 'ee/roadmap/constants';
+import groupEpics from 'ee/roadmap/queries/groupEpics.query.graphql';
+import epicChildEpics from 'ee/roadmap/queries/epicChildEpics.query.graphql';
 
 import axios from '~/lib/utils/axios_utils';
 import testAction from 'spec/helpers/vuex_action_helper';
@@ -22,6 +24,8 @@ import {
   mockRawEpic,
   mockFormattedEpic,
   mockSortedBy,
+  mockGroupEpicsQueryResponse,
+  mockEpicChildEpicsQueryResponse,
 } from '../mock_data';
 
 const mockTimeframeMonths = getTimeframeForMonthsView(mockTimeframeInitialDate);
@@ -76,6 +80,73 @@ describe('Roadmap Vuex Actions', () => {
     });
   });
 
+  describe('fetchGroupEpics', () => {
+    let mockState;
+    let expectedVariables;
+
+    beforeEach(() => {
+      mockState = {
+        fullPath: 'gitlab-org',
+        epicsState: 'all',
+        sortedBy: 'start_date_asc',
+        presetType: PRESET_TYPES.MONTHS,
+        filterParams: {},
+        timeframe: mockTimeframeMonths,
+      };
+
+      expectedVariables = {
+        fullPath: 'gitlab-org',
+        state: mockState.epicsState,
+        sort: mockState.sortedBy,
+        startDate: '2017-11-1',
+        dueDate: '2018-6-30',
+      };
+    });
+
+    it('should fetch Group Epics using GraphQL client when epicIid is not present in state', done => {
+      spyOn(epicUtils.gqClient, 'query').and.returnValue(
+        Promise.resolve({
+          data: mockGroupEpicsQueryResponse.data,
+        }),
+      );
+
+      actions
+        .fetchGroupEpics(mockState)
+        .then(() => {
+          expect(epicUtils.gqClient.query).toHaveBeenCalledWith({
+            query: groupEpics,
+            variables: expectedVariables,
+          });
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+
+    it('should fetch child Epics of an Epic using GraphQL client when epicIid is present in state', done => {
+      spyOn(epicUtils.gqClient, 'query').and.returnValue(
+        Promise.resolve({
+          data: mockEpicChildEpicsQueryResponse.data,
+        }),
+      );
+
+      mockState.epicIid = '1';
+
+      actions
+        .fetchGroupEpics(mockState)
+        .then(() => {
+          expect(epicUtils.gqClient.query).toHaveBeenCalledWith({
+            query: epicChildEpics,
+            variables: {
+              iid: '1',
+              ...expectedVariables,
+            },
+          });
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+  });
+
   describe('requestEpics', () => {
     it('Should set `epicsFetchInProgress` to true', done => {
       testAction(actions.requestEpics, {}, state, [{ type: 'REQUEST_EPICS' }], [], done);
@@ -315,7 +386,7 @@ describe('Roadmap Vuex Actions', () => {
   describe('refreshEpicDates', () => {
     it('Should update epics after refreshing epic dates to match with updated timeframe', done => {
       const epics = rawEpics.map(epic =>
-        formatEpicDetails(epic, state.timeframeStartDate, state.timeframeEndDate),
+        epicUtils.formatEpicDetails(epic, state.timeframeStartDate, state.timeframeEndDate),
       );
 
       testAction(

ee/spec/javascripts/roadmap/utils/epic_utils_spec.js

@@ -2,7 +2,7 @@ import * as epicUtils from 'ee/roadmap/utils/epic_utils';
 
 import { parsePikadayDate } from '~/lib/utils/datetime_utility';
 
-import { rawEpics } from '../mock_data';
+import { rawEpics, mockGroupEpicsQueryResponse } from '../mock_data';
 
 describe('processEpicDates', () => {
   const timeframeStartDate = new Date(2017, 0, 1);
@@ -89,3 +89,19 @@ describe('formatEpicDetails', () => {
     expect(epic.endDateUndefined).toBe(true);
   });
 });
+
+describe('extractGroupEpics', () => {
+  it('returns array of epics with `edges->nodes` nesting removed', () => {
+    const { edges } = mockGroupEpicsQueryResponse.data.group.epics;
+    const extractedEpics = epicUtils.extractGroupEpics(edges);
+
+    expect(extractedEpics.length).toBe(edges.length);
+    expect(extractedEpics[0]).toEqual(
+      jasmine.objectContaining({
+        ...edges[0].node,
+        groupName: edges[0].node.group.name,
+        groupFullName: edges[0].node.group.fullName,
+      }),
+    );
+  });
+});

ee/spec/javascripts/roadmap/utils/roadmap_utils_spec.js

@@ -6,9 +6,10 @@ import {
   getTimeframeForWeeksView,
   extendTimeframeForWeeksView,
   extendTimeframeForAvailableWidth,
+  getEpicsTimeframeRange,
   getEpicsPathForPreset,
-  sortEpics,
   assignDates,
+  sortEpics,
 } from 'ee/roadmap/utils/roadmap_utils';
 
 import { PRESET_TYPES } from 'ee/roadmap/constants';
@@ -297,6 +298,53 @@ describe('extendTimeframeForAvailableWidth', () => {
   });
 });
 
+describe('getEpicsTimeframeRange', () => {
+  it('returns object containing startDate and dueDate based on provided timeframe for Quarters', () => {
+    const timeframeQuarters = getTimeframeForQuartersView(new Date(2018, 0, 1));
+    const range = getEpicsTimeframeRange({
+      presetType: PRESET_TYPES.QUARTERS,
+      timeframe: timeframeQuarters,
+    });
+
+    expect(range).toEqual(
+      jasmine.objectContaining({
+        startDate: '2017-7-1',
+        dueDate: '2019-3-31',
+      }),
+    );
+  });
+
+  it('returns object containing startDate and dueDate based on provided timeframe for Months', () => {
+    const timeframeMonths = getTimeframeForMonthsView(new Date(2018, 0, 1));
+    const range = getEpicsTimeframeRange({
+      presetType: PRESET_TYPES.MONTHS,
+      timeframe: timeframeMonths,
+    });
+
+    expect(range).toEqual(
+      jasmine.objectContaining({
+        startDate: '2017-11-1',
+        dueDate: '2018-6-30',
+      }),
+    );
+  });
+
+  it('returns object containing startDate and dueDate based on provided timeframe for Weeks', () => {
+    const timeframeWeeks = getTimeframeForWeeksView(new Date(2018, 0, 1));
+    const range = getEpicsTimeframeRange({
+      presetType: PRESET_TYPES.WEEKS,
+      timeframe: timeframeWeeks,
+    });
+
+    expect(range).toEqual(
+      jasmine.objectContaining({
+        startDate: '2017-12-17',
+        dueDate: '2018-2-3',
+      }),
+    );
+  });
+});
+
 describe('getEpicsPathForPreset', () => {
   const basePath = '/groups/gitlab-org/-/epics.json';
   const filterQueryString = 'scope=all&utf8=✓&state=opened&label_name[]=Bug';