Limit incident assignees to single

Drop username assignees in GraphQL
to single assignee to enable a safe
API and limit incident list

app/assets/javascripts/incidents/components/incidents_list.vue

@@ -354,7 +354,7 @@ export default {
       return INCIDENT_SEVERITY[severity];
     },
     handleFilterIncidents(filters) {
-      const filterParams = { authorUsername: '', assigneeUsername: [], search: '' };
+      const filterParams = { authorUsername: '', assigneeUsername: '', search: '' };
 
       filters.forEach(filter => {
         if (typeof filter === 'object') {
@@ -363,7 +363,7 @@ export default {
               filterParams.authorUsername = filter.value.data;
               break;
             case 'assignee_username':
-              filterParams.assigneeUsername.push(filter.value.data);
+              filterParams.assigneeUsername = filter.value.data;
               break;
             case 'filtered-search-term':
               if (filter.value.data !== '') filterParams.search = filter.value.data;

app/assets/javascripts/incidents/graphql/queries/get_count_by_status.query.graphql

@@ -3,7 +3,7 @@ query getIncidentsCountByStatus(
   $projectPath: ID!
   $issueTypes: [IssueType!]
   $authorUsername: String = ""
-  $assigneeUsernames: [String!] = []
+  $assigneeUsernames: String = ""
 ) {
   project(fullPath: $projectPath) {
     issueStatusCounts(

app/assets/javascripts/incidents/graphql/queries/get_incidents.query.graphql

@@ -11,7 +11,7 @@ query getIncidents(
   $nextPageCursor: String = ""
   $searchTerm: String = ""
   $authorUsername: String = ""
-  $assigneeUsernames: [String!] = []
+  $assigneeUsernames: String = ""
 ) {
   project(fullPath: $projectPath) {
     issues(

app/graphql/resolvers/concerns/issue_resolver_arguments.rb

@@ -21,7 +21,7 @@ module IssueResolverArguments
     argument :author_username, GraphQL::STRING_TYPE,
               required: false,
               description: 'Username of the author of the issue'
-    argument :assignee_username, [GraphQL::STRING_TYPE],
+    argument :assignee_username, GraphQL::STRING_TYPE,
               required: false,
               description: 'Username of a user assigned to the issue'
     argument :assignee_id, GraphQL::STRING_TYPE,

doc/api/graphql/reference/gitlab_schema.graphql

@@ -6803,7 +6803,7 @@ type Group {
     """
     Username of a user assigned to the issue
     """
-    assigneeUsername: [String!]
+    assigneeUsername: String
 
     """
     Username of the author of the issue
@@ -12283,7 +12283,7 @@ type Project {
     """
     Username of a user assigned to the issue
     """
-    assigneeUsername: [String!]
+    assigneeUsername: String
 
     """
     Username of the author of the issue
@@ -12378,7 +12378,7 @@ type Project {
     """
     Username of a user assigned to the issue
     """
-    assigneeUsername: [String!]
+    assigneeUsername: String
 
     """
     Username of the author of the issue
@@ -12463,7 +12463,7 @@ type Project {
     """
     Username of a user assigned to the issue
     """
-    assigneeUsername: [String!]
+    assigneeUsername: String
 
     """
     Username of the author of the issue

doc/api/graphql/reference/gitlab_schema.json

@@ -18905,17 +18905,9 @@
                   "name": "assigneeUsername",
                   "description": "Username of a user assigned to the issue",
                   "type": {
-                    "kind": "LIST",
-                    "name": null,
-                    "ofType": {
-                      "kind": "NON_NULL",
-                      "name": null,
-                      "ofType": {
-                        "kind": "SCALAR",
-                        "name": "String",
-                        "ofType": null
-                      }
-                    }
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
                   },
                   "defaultValue": null
                 },
@@ -36505,17 +36497,9 @@
                   "name": "assigneeUsername",
                   "description": "Username of a user assigned to the issue",
                   "type": {
-                    "kind": "LIST",
-                    "name": null,
-                    "ofType": {
-                      "kind": "NON_NULL",
-                      "name": null,
-                      "ofType": {
-                        "kind": "SCALAR",
-                        "name": "String",
-                        "ofType": null
-                      }
-                    }
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
                   },
                   "defaultValue": null
                 },
@@ -36734,17 +36718,9 @@
                   "name": "assigneeUsername",
                   "description": "Username of a user assigned to the issue",
                   "type": {
-                    "kind": "LIST",
-                    "name": null,
-                    "ofType": {
-                      "kind": "NON_NULL",
-                      "name": null,
-                      "ofType": {
-                        "kind": "SCALAR",
-                        "name": "String",
-                        "ofType": null
-                      }
-                    }
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
                   },
                   "defaultValue": null
                 },
@@ -36929,17 +36905,9 @@
                   "name": "assigneeUsername",
                   "description": "Username of a user assigned to the issue",
                   "type": {
-                    "kind": "LIST",
-                    "name": null,
-                    "ofType": {
-                      "kind": "NON_NULL",
-                      "name": null,
-                      "ofType": {
-                        "kind": "SCALAR",
-                        "name": "String",
-                        "ofType": null
-                      }
-                    }
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
                   },
                   "defaultValue": null
                 },

spec/frontend/incidents/components/incidents_list_spec.js

@@ -380,7 +380,7 @@ describe('Incidents List', () => {
         wrapper.vm.handleFilterIncidents(mockFilters);
 
         expect(wrapper.vm.authorUsername).toBe('root');
-        expect(wrapper.vm.assigneeUsernames).toEqual(['root2']);
+        expect(wrapper.vm.assigneeUsernames).toEqual('root2');
         expect(wrapper.vm.searchTerm).toBe(mockFilters[2].value.data);
       });
 

spec/graphql/resolvers/issues_resolver_spec.rb

@@ -54,13 +54,6 @@ RSpec.describe Resolvers::IssuesResolver do
         expect(resolve_issues(assignee_id: IssuableFinder::Params::FILTER_ANY)).to contain_exactly(issue2)
       end
 
-      it 'filters by two assignees' do
-        user_2 = create(:user)
-        issue2.update!(assignees: [assignee, user_2])
-
-        expect(resolve_issues(assignee_id: [assignee.id, user_2.id])).to contain_exactly(issue2)
-      end
-
       it 'filters by no assignee' do
         expect(resolve_issues(assignee_id: IssuableFinder::Params::FILTER_NONE)).to contain_exactly(issue1)
       end