Revert include_parent_milestones in milestones API

- Revert changes that added the param
include_parent_milestones to project milestones

changelogs/unreleased/196066-add-milestone-expired-info-be-2.yml

----
-title: Add include_parent_milestones param to milestones API
-merge_request: 36944
-author:
-type: added

doc/api/milestones.md

@@ -26,13 +26,12 @@ GET /projects/:id/milestones?search=version
 Parameters:
 
 | Attribute | Type   | Required | Description |
-| ---------------------------- | ------ | -------- | ----------- |
+| --------- | ------ | -------- | ----------- |
 | `id`      | integer/string | yes | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
-| `iids[]`                     | integer array | optional | Return only the milestones having the given `iid`. Will be ignored if `include_parent_milestones` is set to `true` |
+| `iids[]`  | integer array | optional | Return only the milestones having the given `iid` |
 | `state`   | string | optional | Return only `active` or `closed` milestones |
 | `title`   | string | optional | Return only the milestones having the given `title` |
 | `search`  | string | optional | Return only milestones with a title or description matching the provided string |
-| `include_parent_milestones`  | boolean | optional | Include milestones from parent group and ancestors. Introduced in [GitLab 13.2](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/36944) |
 
 ```shell
 curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/5/milestones"

lib/api/milestone_responses.rb

@@ -31,14 +31,12 @@ module API
         end
 
         def list_milestones_for(parent)
-          finder_params = params.merge(milestones_finder_params(parent))
-          milestones = MilestonesFinder.new(finder_params).execute
+          milestones = parent.milestones.order_id_desc
+          milestones = Milestone.filter_by_state(milestones, params[:state])
+          milestones = filter_by_iid(milestones, params[:iids]) if params[:iids].present?
+          milestones = filter_by_title(milestones, params[:title]) if params[:title]
           milestones = filter_by_search(milestones, params[:search]) if params[:search]
 
-          if params[:iids].present? && !params[:include_parent_milestones]
-            milestones = filter_by_iid(milestones, params[:iids])
-          end
-
           present paginate(milestones), with: Entities::Milestone
         end
 
@@ -98,25 +96,6 @@ module API
             [MergeRequestsFinder, Entities::MergeRequestBasic]
           end
         end
-
-        def milestones_finder_params(parent)
-          if parent.is_a?(Group)
-            { group_ids: parent.id }
-          else
-            {
-              project_ids: parent.id,
-              group_ids: parent_group_ids(parent)
-            }
-          end
-        end
-
-        def parent_group_ids(parent)
-          return unless params[:include_parent_milestones].present?
-
-          parent.group.self_and_ancestors
-                      .public_or_visible_to_user(current_user)
-                      .select(:id)
-        end
       end
     end
   end

lib/api/project_milestones.rb

@@ -16,8 +16,6 @@ module API
       end
       params do
         use :list_params
-        optional :include_parent_milestones, type: Boolean, default: false,
-                  desc: 'Include milestones from parent group and ancestors'
       end
       get ":id/milestones" do
         authorize! :read_milestone, user_project

spec/requests/api/project_milestones_spec.rb

@@ -3,10 +3,10 @@
 require 'spec_helper'
 
 RSpec.describe API::ProjectMilestones do
-  let_it_be(:user) { create(:user) }
-  let_it_be(:project) { create(:project, namespace: user.namespace ) }
-  let_it_be(:closed_milestone) { create(:closed_milestone, project: project, title: 'version1', description: 'closed milestone') }
-  let_it_be(:milestone) { create(:milestone, project: project, title: 'version2', description: 'open milestone') }
+  let(:user) { create(:user) }
+  let!(:project) { create(:project, namespace: user.namespace ) }
+  let!(:closed_milestone) { create(:closed_milestone, project: project, title: 'version1', description: 'closed milestone') }
+  let!(:milestone) { create(:milestone, project: project, title: 'version2', description: 'open milestone') }
 
   before do
     project.add_developer(user)
@@ -16,65 +16,6 @@ RSpec.describe API::ProjectMilestones do
     let(:route) { "/projects/#{project.id}/milestones" }
   end
 
-  describe 'GET /projects/:id/milestones' do
-    context 'when include_parent_milestones is true' do
-      let_it_be(:group) { create(:group, :public) }
-      let_it_be(:child_group) { create(:group, :public, parent: group) }
-      let_it_be(:child_project) { create(:project, group: child_group) }
-      let_it_be(:project_milestone) { create(:milestone, project: child_project) }
-      let_it_be(:group_milestone) { create(:milestone, group: group) }
-      let_it_be(:child_group_milestone) { create(:milestone, group: child_group) }
-
-      before do
-        child_project.add_developer(user)
-      end
-
-      it 'includes parent groups milestones' do
-        milestones = [child_group_milestone, group_milestone, project_milestone]
-
-        get api("/projects/#{child_project.id}/milestones", user),
-            params: { include_parent_milestones: true }
-
-        expect(response).to have_gitlab_http_status(:ok)
-        expect(json_response.size).to eq(3)
-        expect(json_response.map { |entry| entry["id"] }).to eq(milestones.map(&:id))
-      end
-
-      context 'when user has no access to an ancestor group' do
-        before do
-          [child_group, group].each do |group|
-            group.update!(visibility_level: Gitlab::VisibilityLevel::PRIVATE)
-          end
-        end
-
-        it 'does not show ancestor group milestones' do
-          milestones = [child_group_milestone, project_milestone]
-
-          get api("/projects/#{child_project.id}/milestones", user),
-              params: { include_parent_milestones: true }
-
-          expect(response).to have_gitlab_http_status(:ok)
-          expect(json_response.size).to eq(2)
-          expect(json_response.map { |entry| entry["id"] }).to eq(milestones.map(&:id))
-        end
-      end
-
-      context 'when filtering by iids' do
-        it 'does not filter by iids' do
-          milestones = [child_group_milestone, group_milestone, project_milestone]
-
-          get api("/projects/#{child_project.id}/milestones", user),
-              params: { include_parent_milestones: true, iids: [group_milestone.iid] }
-
-          expect(response).to have_gitlab_http_status(:ok)
-          expect(json_response.size).to eq(3)
-
-          expect(json_response.map { |entry| entry["id"] }).to eq(milestones.map(&:id))
-        end
-      end
-    end
-  end
-
   describe 'DELETE /projects/:id/milestones/:milestone_id' do
     let(:guest) { create(:user) }
     let(:reporter) { create(:user) }