GraphQL: expose milestone iid

app/graphql/types/milestone_type.rb

@@ -14,6 +14,9 @@ module Types
     field :id, GraphQL::ID_TYPE, null: false,
           description: 'ID of the milestone.'
 
+    field :iid, GraphQL::ID_TYPE, null: false,
+          description: "Internal ID of the milestone."
+
     field :title, GraphQL::STRING_TYPE, null: false,
           description: 'Title of the milestone.'
 

changelogs/unreleased/kassio-graphql-expose-milestone-iid.yml

+---
+title: 'GraphQL: expose milestone iid'
+merge_request: 57732
+author:
+type: changed

doc/api/graphql/reference/index.md

@@ -4167,6 +4167,7 @@ Represents a milestone.
 | `dueDate` | [`Time`](#time) | Timestamp of the milestone due date. |
 | `groupMilestone` | [`Boolean!`](#boolean) | Indicates if milestone is at group level. |
 | `id` | [`ID!`](#id) | ID of the milestone. |
+| `iid` | [`ID!`](#id) | Internal ID of the milestone. |
 | `projectMilestone` | [`Boolean!`](#boolean) | Indicates if milestone is at project level. |
 | `report` | [`TimeboxReport`](#timeboxreport) | Historically accurate report about the timebox. |
 | `startDate` | [`Time`](#time) | Timestamp of the milestone start date. |

spec/graphql/types/milestone_type_spec.rb

@@ -9,7 +9,7 @@ RSpec.describe GitlabSchema.types['Milestone'] do
 
   it 'has the expected fields' do
     expected_fields = %w[
-      id title description state web_path
+      id iid title description state web_path
       due_date start_date created_at updated_at
       project_milestone group_milestone subgroup_milestone
       stats