Expose hasParent on epic

Expose hasParent on epic
Refactor epic graphQL queries for roadmap
Backend for multi level epic hierarchy on roadmaps

doc/api/graphql/reference/gitlab_schema.graphql

@@ -2119,6 +2119,11 @@ type Epic implements Noteable {
   """
   hasIssues: Boolean!
 
+  """
+  Indicates if the epic has a parent epic
+  """
+  hasParent: Boolean!
+
   """
   Current health status of the epic
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -6224,6 +6224,24 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "hasParent",
+              "description": "Indicates if the epic has a parent epic",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "SCALAR",
+                  "name": "Boolean",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "healthStatus",
               "description": "Current health status of the epic",

doc/api/graphql/reference/index.md

@@ -349,6 +349,7 @@ Represents an epic.
 | `group` | Group! | Group to which the epic belongs |
 | `hasChildren` | Boolean! | Indicates if the epic has children |
 | `hasIssues` | Boolean! | Indicates if the epic has direct issues |
+| `hasParent` | Boolean! | Indicates if the epic has a parent epic |
 | `healthStatus` | EpicHealthStatus | Current health status of the epic |
 | `id` | ID! | ID of the epic |
 | `iid` | ID! | Internal ID of the epic |

ee/app/assets/javascripts/roadmap/queries/epic.fragment.graphql

+fragment BaseEpic on Epic {
+  id
+  iid
+  title
+  description
+  state
+  webUrl
+  startDate
+  dueDate
+  hasChildren
+  descendantCounts {
+    openedEpics
+    closedEpics
+    openedIssues
+    closedIssues
+  }
+  group {
+    name
+    fullName
+  }
+}
+
+fragment EpicNode on Epic {
+  ...BaseEpic
+  state
+  reference(full: true)
+  createdAt
+  closedAt
+  relationPath
+  createdAt
+  hasChildren
+  hasIssues
+  group {
+    fullPath
+  }
+}

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

+#import "./epic.fragment.graphql"
+
 query epicChildEpics(
   $fullPath: ID!
   $iid: ID!
@@ -12,6 +14,7 @@ query epicChildEpics(
     epic(iid: $iid) {
       id
       title
+      hasChildren
       children(state: $state, sort: $sort, startDate: $startDate, endDate: $dueDate) {
         edges {
           node {
@@ -22,6 +25,7 @@ query epicChildEpics(
             webUrl
             startDate
             dueDate
+            hasChildren
             descendantWeightSum {
               closedIssues
               openedIssues
@@ -33,21 +37,7 @@ query epicChildEpics(
             children {
               edges {
                 node {
-                  id
-                  title
-                  description
-                  state
-                  webUrl
-                  startDate
-                  dueDate
-                  descendantWeightSum {
-                    closedIssues
-                    openedIssues
-                  }
-                  group {
-                    name
-                    fullName
-                  }
+                  ...EpicNode
                 }
               }
             }

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

+#import "./epic.fragment.graphql"
+
 query groupEpics(
   $fullPath: ID!
   $state: EpicState
@@ -22,39 +24,11 @@ query groupEpics(
     ) {
       edges {
         node {
-          id
-          title
-          description
-          state
-          webUrl
-          startDate
-          dueDate
-          descendantWeightSum {
-            closedIssues
-            openedIssues
-          }
-          group {
-            name
-            fullName
-          }
+          ...BaseEpic
           children {
             edges {
               node {
-                id
-                title
-                description
-                state
-                webUrl
-                startDate
-                dueDate
-                descendantWeightSum {
-                  closedIssues
-                  openedIssues
-                }
-                group {
-                  name
-                  fullName
-                }
+                ...EpicNode
               }
             }
           }

ee/app/graphql/types/epic_type.rb

@@ -84,6 +84,9 @@ module Types
           description: 'Indicates if the epic has children'
     field :has_issues, GraphQL::BOOLEAN_TYPE, null: false,
           description: 'Indicates if the epic has direct issues'
+    field :has_parent, GraphQL::BOOLEAN_TYPE, null: false,
+          method: :has_parent?,
+          description: 'Indicates if the epic has a parent epic'
 
     field :web_path, GraphQL::STRING_TYPE, null: false,
           description: 'Web path of the epic',

ee/app/models/ee/epic.rb

@@ -322,6 +322,10 @@ module EE
       issues.any?
     end
 
+    def has_parent?
+      !!parent_id
+    end
+
     def child?(id)
       children.where(id: id).exists?
     end

ee/changelogs/unreleased/213401-expose-epic-has-parent.yml

+---
+title: Expose hasParent GraphQL field on epic
+merge_request: 29214
+author:
+type: added

ee/spec/graphql/types/epic_type_spec.rb

@@ -8,7 +8,7 @@ describe GitlabSchema.types['Epic'] do
       id iid title description confidential state group parent author labels
       start_date start_date_is_fixed start_date_fixed start_date_from_milestones
       due_date due_date_is_fixed due_date_fixed due_date_from_milestones
-      closed_at created_at updated_at children has_children has_issues
+      closed_at created_at updated_at children has_children has_issues has_parent
       web_path web_url relation_path reference issues user_permissions
       notes discussions relative_position subscribed participants
       descendant_counts descendant_weight_sum upvotes downvotes health_status

ee/spec/models/epic_spec.rb

@@ -551,6 +551,20 @@ describe Epic do
     end
   end
 
+  describe '#has_parent?' do
+    let_it_be(:epic, reload: true) { create(:epic, group: group) }
+
+    it 'has no parent' do
+      expect(epic.has_parent?).to be_falsey
+    end
+
+    it 'has parent' do
+      create(:epic, group: group, children: [epic])
+
+      expect(epic.has_parent?).to be_truthy
+    end
+  end
+
   context 'mentioning other objects' do
     let(:epic) { create(:epic, group: group) }