Change GraphQL::ID_TYPE to a GlobalIDType

and remove rubocop exception

.rubocop_todo.yml

@@ -1244,7 +1244,6 @@ Graphql/IDType:
     - 'app/graphql/mutations/snippets/destroy.rb'
     - 'app/graphql/mutations/snippets/mark_as_spam.rb'
     - 'app/graphql/mutations/snippets/update.rb'
-    - 'app/graphql/resolvers/boards_resolver.rb'
     - 'app/graphql/resolvers/design_management/design_at_version_resolver.rb'
     - 'app/graphql/resolvers/design_management/design_resolver.rb'
     - 'app/graphql/resolvers/design_management/designs_resolver.rb'

app/graphql/resolvers/boards_resolver.rb

@@ -4,7 +4,7 @@ module Resolvers
   class BoardsResolver < BaseResolver
     type Types::BoardType, null: true
 
-    argument :id, GraphQL::ID_TYPE,
+    argument :id, ::Types::GlobalIDType[::Board],
              required: false,
              description: 'Find a board by its ID'
 
@@ -23,10 +23,13 @@ module Resolvers
 
     private
 
-    def extract_board_id(gid)
-      return unless gid.present?
+    def extract_board_id(id)
+      return unless id.present?
 
-      GitlabSchema.parse_gid(gid, expected_type: ::Board).model_id
+      # TODO: remove this line when the compatibility layer is removed
+      # See: https://gitlab.com/gitlab-org/gitlab/-/issues/257883
+      id = Types::GlobalIDType[Board].coerce_isolated_input(id)
+      id.model_id
     end
   end
 end

doc/api/graphql/reference/gitlab_schema.graphql

@@ -7746,7 +7746,7 @@ type Group {
     """
     Find a board by its ID
     """
-    id: ID
+    id: BoardID
 
     """
     Returns the last _n_ elements from the list.
@@ -13733,7 +13733,7 @@ type Project {
     """
     Find a board by its ID
     """
-    id: ID
+    id: BoardID
 
     """
     Returns the last _n_ elements from the list.

doc/api/graphql/reference/gitlab_schema.json

@@ -21309,7 +21309,7 @@
                   "description": "Find a board by its ID",
                   "type": {
                     "kind": "SCALAR",
-                    "name": "ID",
+                    "name": "BoardID",
                     "ofType": null
                   },
                   "defaultValue": null
@@ -40291,7 +40291,7 @@
                   "description": "Find a board by its ID",
                   "type": {
                     "kind": "SCALAR",
-                    "name": "ID",
+                    "name": "BoardID",
                     "ofType": null
                   },
                   "defaultValue": null