Add support for querying for a single board

in both Group and Project graphql queries

Update graphql docs

app/graphql/resolvers/boards_resolver.rb

@@ -4,7 +4,11 @@ module Resolvers
   class BoardsResolver < BaseResolver
     type Types::BoardType, null: true
 
-    def resolve(**args)
+    argument :id, GraphQL::ID_TYPE,
+             required: false,
+             description: 'Find a board by its ID'
+
+    def resolve(id: nil)
       # The project or group could have been loaded in batch by `BatchLoader`.
       # At this point we need the `id` of the project/group to query for boards, so
       # make sure it's loaded and not `nil` before continuing.
@@ -12,7 +16,17 @@ module Resolvers
 
       return Board.none unless parent
 
-      Boards::ListService.new(parent, context[:current_user]).execute(create_default_board: false)
+      Boards::ListService.new(parent, context[:current_user], board_id: extract_board_id(id)).execute(create_default_board: false)
+    rescue ActiveRecord::RecordNotFound
+      Board.none
+    end
+
+    private
+
+    def extract_board_id(gid)
+      return unless gid.present?
+
+      GitlabSchema.parse_gid(gid, expected_type: ::Board).model_id
     end
   end
 end

app/graphql/types/group_type.rb

@@ -52,6 +52,12 @@ module Types
           null: true,
           description: 'Boards of the group',
           resolver: Resolvers::BoardsResolver
+
+    field :board,
+          Types::BoardType,
+          null: true,
+          description: 'A single board of the group',
+          resolver: Resolvers::BoardsResolver.single
   end
 end
 

app/graphql/types/project_type.rb

@@ -185,6 +185,12 @@ module Types
           null: true,
           description: 'Boards of the project',
           resolver: Resolvers::BoardsResolver
+
+    field :board,
+          Types::BoardType,
+          null: true,
+          description: 'A single board of the project',
+          resolver: Resolvers::BoardsResolver.single
   end
 end
 

changelogs/unreleased/bw-board-query-by-id.yml

+---
+title: Allow group/project board to be queried by ID via GraphQL
+merge_request: 24825
+author:
+type: added

doc/api/graphql/reference/gitlab_schema.graphql

@@ -2770,6 +2770,16 @@ type Group {
   """
   avatarUrl: String
 
+  """
+  A single board of the group
+  """
+  board(
+    """
+    Find a board by its ID
+    """
+    id: ID
+  ): Board
+
   """
   Boards of the group
   """
@@ -2789,6 +2799,11 @@ type Group {
     """
     first: Int
 
+    """
+    Find a board by its ID
+    """
+    id: ID
+
     """
     Returns the last _n_ elements from the list.
     """
@@ -5254,6 +5269,16 @@ type Project {
   """
   avatarUrl: String
 
+  """
+  A single board of the project
+  """
+  board(
+    """
+    Find a board by its ID
+    """
+    id: ID
+  ): Board
+
   """
   Boards of the project
   """
@@ -5273,6 +5298,11 @@ type Project {
     """
     first: Int
 
+    """
+    Find a board by its ID
+    """
+    id: ID
+
     """
     Returns the last _n_ elements from the list.
     """

doc/api/graphql/reference/gitlab_schema.json

@@ -368,10 +368,43 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "board",
+              "description": "A single board of the project",
+              "args": [
+                {
+                  "name": "id",
+                  "description": "Find a board by its ID",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "ID",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                }
+              ],
+              "type": {
+                "kind": "OBJECT",
+                "name": "Board",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "boards",
               "description": "Boards of the project",
               "args": [
+                {
+                  "name": "id",
+                  "description": "Find a board by its ID",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "ID",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
                 {
                   "name": "after",
                   "description": "Returns the elements in the list that come after the specified cursor.",
@@ -3175,10 +3208,43 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "board",
+              "description": "A single board of the group",
+              "args": [
+                {
+                  "name": "id",
+                  "description": "Find a board by its ID",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "ID",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                }
+              ],
+              "type": {
+                "kind": "OBJECT",
+                "name": "Board",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "boards",
               "description": "Boards of the group",
               "args": [
+                {
+                  "name": "id",
+                  "description": "Find a board by its ID",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "ID",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
                 {
                   "name": "after",
                   "description": "Returns the elements in the list that come after the specified cursor.",

doc/api/graphql/reference/index.md

@@ -426,6 +426,7 @@ Autogenerated return type of EpicTreeReorder
 | ---   |  ---- | ----------  |
 | `autoDevopsEnabled` | Boolean | Indicates whether Auto DevOps is enabled for all projects within this group |
 | `avatarUrl` | String | Avatar URL of the group |
+| `board` | Board | A single board of the group |
 | `description` | String | Description of the namespace |
 | `descriptionHtml` | String | The GitLab Flavored Markdown rendering of `description` |
 | `emailsDisabled` | Boolean | Indicates if a group has email notifications disabled |
@@ -801,6 +802,7 @@ Information about pagination in a connection.
 | `archived` | Boolean | Indicates the archived status of the project |
 | `autocloseReferencedIssues` | Boolean | Indicates if issues referenced by merge requests and commits within the default branch are closed automatically |
 | `avatarUrl` | String | URL to avatar image file of the project |
+| `board` | Board | A single board of the project |
 | `containerRegistryEnabled` | Boolean | Indicates if the project stores Docker container images in a container registry |
 | `createdAt` | Time | Timestamp of the project creation |
 | `description` | String | Short description of the project |

ee/spec/requests/api/graphql/boards/boards_query_spec.rb

@@ -13,7 +13,6 @@ describe 'get list of boards' do
 
   describe 'for a group' do
     let(:board_parent) { create(:group, :private) }
-    let(:boards_data) { graphql_data['group']['boards']['edges'] }
 
     it_behaves_like 'group and project boards query'
   end

spec/graphql/resolvers/boards_resolver_spec.rb

@@ -45,6 +45,21 @@ describe Resolvers::BoardsResolver do
         expect(resolve_boards).to eq [board1]
       end
     end
+
+    context 'when querying for a single board' do
+      let(:board1) { create(:board, name: 'One', resource_parent: board_parent) }
+
+      it 'returns specified board' do
+        expect(resolve_boards(args: { id: global_id_of(board1) })).to eq [board1]
+      end
+
+      it 'returns nil if board not found' do
+        outside_parent = create(board_parent.class.underscore.to_sym)
+        outside_board  = create(:board, name: 'outside board', resource_parent: outside_parent)
+
+        expect(resolve_boards(args: { id: global_id_of(outside_board) })).to eq Board.none
+      end
+    end
   end
 
   describe '#resolve' do

spec/requests/api/graphql/boards/boards_query_spec.rb

@@ -9,14 +9,12 @@ describe 'get list of boards' do
 
   describe 'for a project' do
     let(:board_parent) { create(:project, :repository, :private) }
-    let(:boards_data) { graphql_data['project']['boards']['edges'] }
 
     it_behaves_like 'group and project boards query'
   end
 
   describe 'for a group' do
     let(:board_parent) { create(:group, :private) }
-    let(:boards_data) { graphql_data['group']['boards']['edges'] }
 
     before do
       allow(board_parent).to receive(:multiple_issue_boards_available?).and_return(false)

spec/support/shared_contexts/requests/api/graphql/group_and_project_boards_query_shared_context.rb

@@ -5,6 +5,8 @@ RSpec.shared_context 'group and project boards query context' do
   let(:current_user) { user }
   let(:params) { '' }
   let(:board_parent_type) { board_parent.class.to_s.downcase }
+  let(:boards_data) { graphql_data[board_parent_type]['boards']['edges'] }
+  let(:board_data) { graphql_data[board_parent_type]['board'] }
   let(:start_cursor) { graphql_data[board_parent_type]['boards']['pageInfo']['startCursor'] }
   let(:end_cursor) { graphql_data[board_parent_type]['boards']['pageInfo']['endCursor'] }
 
@@ -28,6 +30,18 @@ RSpec.shared_context 'group and project boards query context' do
     )
   end
 
+  def query_single_board(board_params = params)
+    graphql_query_for(
+      board_parent_type,
+      { 'fullPath' => board_parent.full_path },
+      <<~BOARD
+        board(#{board_params}) {
+          #{all_graphql_fields_for('board'.classify)}
+        }
+      BOARD
+    )
+  end
+
   def grab_names(data = boards_data)
     data.map do |board|
       board.dig('node', 'name')

spec/support/shared_examples/requests/api/graphql/group_and_project_boards_query_shared_examples.rb

@@ -89,4 +89,24 @@ RSpec.shared_examples 'group and project boards query' do
       end
     end
   end
+
+  context 'when querying for a single board' do
+    before do
+      board_parent.add_reporter(current_user)
+    end
+
+    it_behaves_like 'a working graphql query' do
+      before do
+        post_graphql(query_single_board, current_user: current_user)
+      end
+    end
+
+    it 'finds the correct board' do
+      board = create(:board, resource_parent: board_parent, name: 'A')
+
+      post_graphql(query_single_board("id: \"#{global_id_of(board)}\""), current_user: current_user)
+
+      expect(board_data['name']).to eq board.name
+    end
+  end
 end