feat: add support to resource milestone events

Fixes #1154

3 files changed, 70 insertions, 0 deletions

diff --git a/docs/gl_objects/milestones.rst b/docs/gl_objects/milestones.rst
index f24e13f..40f9ba6 100644
--- a/docs/gl_objects/milestones.rst
+++ b/docs/gl_objects/milestones.rst
@@ -2,6 +2,9 @@
 Milestones
 ##########
 
+Project milestones
+==================
+
 Reference
 ---------
 
@@ -70,3 +73,33 @@ List the issues related to a milestone::
 List the merge requests related to a milestone::
 
     merge_requests = milestone.merge_requests()
+
+Milestone events
+============
+
+Resource milestone events keep track of what happens to GitLab issues and merge requests.
+
+Reference
+---------
+
+* v4 API:
+
+  + :class:`gitlab.v4.objects.ProjectIssueResourceMilestoneEvent`
+  + :class:`gitlab.v4.objects.ProjectIssueResourceMilestoneEventManager`
+  + :attr:`gitlab.v4.objects.ProjectIssue.resourcemilestoneevents`
+  + :class:`gitlab.v4.objects.ProjectMergeRequestResourceMilestoneEvent`
+  + :class:`gitlab.v4.objects.ProjectMergeRequestResourceMilestoneEventManager`
+  + :attr:`gitlab.v4.objects.ProjectMergeRequest.resourcemilestoneevents`
+
+* GitLab API: https://docs.gitlab.com/ee/api/resource_milestone_events.html
+
+Examples
+--------
+
+Get milestones for a resource (issue, merge request)::
+
+    milestones = resource.resourcemilestoneevents.list()
+
+Get a specific milestone for a resource::
+
+    milestone = resource.resourcemilestoneevents.get(milestone_id)
diff --git a/gitlab/v4/objects.py b/gitlab/v4/objects.py
index 2f3e8a5..16efc39 100644
--- a/gitlab/v4/objects.py
+++ b/gitlab/v4/objects.py
@@ -2654,6 +2654,16 @@ class ProjectIssueResourceLabelEventManager(RetrieveMixin, RESTManager):
     _from_parent_attrs = {"project_id": "project_id", "issue_iid": "iid"}
 
 
+class ProjectIssueResourceMilestoneEvent(RESTObject):
+    pass
+
+
+class ProjectIssueResourceMilestoneEventManager(RetrieveMixin, RESTManager):
+    _path = "/projects/%(project_id)s/issues/%(issue_iid)s/resource_milestone_events"
+    _obj_cls = ProjectIssueResourceMilestoneEvent
+    _from_parent_attrs = {"project_id": "project_id", "issue_iid": "iid"}
+
+
 class ProjectIssue(
     UserAgentDetailMixin,
     SubscribableMixin,
@@ -2672,6 +2682,7 @@ class ProjectIssue(
         ("links", "ProjectIssueLinkManager"),
         ("notes", "ProjectIssueNoteManager"),
         ("resourcelabelevents", "ProjectIssueResourceLabelEventManager"),
+        ("resourcemilestoneevents", "ProjectIssueResourceMilestoneEventManager"),
     )
 
     @cli.register_custom_action("ProjectIssue", ("to_project_id",))
@@ -3065,6 +3076,18 @@ class ProjectMergeRequestResourceLabelEventManager(RetrieveMixin, RESTManager):
     _from_parent_attrs = {"project_id": "project_id", "mr_iid": "iid"}
 
 
+class ProjectMergeRequestResourceMilestoneEvent(RESTObject):
+    pass
+
+
+class ProjectMergeRequestResourceMilestoneEventManager(RetrieveMixin, RESTManager):
+    _path = (
+        "/projects/%(project_id)s/merge_requests/%(mr_iid)s/resource_milestone_events"
+    )
+    _obj_cls = ProjectMergeRequestResourceMilestoneEvent
+    _from_parent_attrs = {"project_id": "project_id", "mr_iid": "iid"}
+
+
 class ProjectMergeRequest(
     SubscribableMixin,
     TodoMixin,
@@ -3083,6 +3106,7 @@ class ProjectMergeRequest(
         ("discussions", "ProjectMergeRequestDiscussionManager"),
         ("notes", "ProjectMergeRequestNoteManager"),
         ("resourcelabelevents", "ProjectMergeRequestResourceLabelEventManager"),
+        ("resourcemilestoneevents", "ProjectMergeRequestResourceMilestoneEventManager"),
     )
 
     @cli.register_custom_action("ProjectMergeRequest")
diff --git a/tools/python_test_v4.py b/tools/python_test_v4.py
index 6ecaf24..717bd24 100644
--- a/tools/python_test_v4.py
+++ b/tools/python_test_v4.py
@@ -782,6 +782,11 @@ assert events
 event = issue1.resourcelabelevents.get(events[0].id)
 assert event
 
+# issue milestones
+milestones = issue1.resourcemilestoneevents.list()
+assert milestones
+milestone = issue1.resourcemilestoneevents.get(milestones[0].id)
+assert milestone
 
 size = len(issue1.discussions.list())
 discussion = issue1.discussions.create({"body": "Discussion body"})
@@ -891,6 +896,14 @@ assert events
 event = mr.resourcelabelevents.get(events[0].id)
 assert event
 
+# mr milestone events
+mr.milestone_id = m1.id
+mr.save()
+milestones = mr.resourcemilestoneevents.list()
+assert milestones
+milestone = mr.resourcemilestoneevents.get(milestones[0].id)
+assert milestone
+
 # rebasing
 assert mr.rebase()