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# frozen_string_literal: true
module MergeRequests
class UpdateAssigneesService < UpdateService
# a stripped down service that only does what it must to update the
# assignees, and knows that it does not have to check for other updates.
# This saves a lot of queries for irrelevant things that cannot possibly
# change in the execution of this service.
def execute(merge_request)
return merge_request unless current_user&.can?(:update_merge_request, merge_request)
old_assignees = merge_request.assignees.to_a
old_ids = old_assignees.map(&:id)
new_ids = new_assignee_ids(merge_request)
return merge_request if merge_request.errors.any?
return merge_request if new_ids.size != update_attrs[:assignee_ids].size
return merge_request if old_ids.to_set == new_ids.to_set # no-change
attrs = update_attrs.merge(assignee_ids: new_ids)
merge_request.update!(**attrs)
# Defer the more expensive operations (handle_assignee_changes) to the background
MergeRequests::HandleAssigneesChangeService
.new(project: project, current_user: current_user)
.async_execute(merge_request, old_assignees, execute_hooks: true)
merge_request
end
private
def new_assignee_ids(merge_request)
# prime the cache - prevent N+1 lookup during authorization loop.
user_ids = update_attrs[:assignee_ids]
return [] if user_ids.empty?
merge_request.project.team.max_member_access_for_user_ids(user_ids)
User.id_in(user_ids).map do |user|
if user.can?(:read_merge_request, merge_request)
user.id
else
merge_request.errors.add(
:assignees,
"Cannot assign #{user.to_reference} to #{merge_request.to_reference}"
)
nil
end
end.compact
end
def assignee_ids
params.fetch(:assignee_ids).reject { _1 == 0 }.first(1)
end
def params
ps = super
# allow either assignee_id or assignee_ids, preferring assignee_id if passed.
{ assignee_ids: ps.key?(:assignee_id) ? Array.wrap(ps[:assignee_id]) : ps[:assignee_ids] }
end
def update_attrs
@attrs ||= { updated_at: Time.current, updated_by: current_user, assignee_ids: assignee_ids }
end
end
end
MergeRequests::UpdateAssigneesService.prepend_mod_with('MergeRequests::UpdateAssigneesService')
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