Instead of plucking IDs this class now uses ActiveRecord::Relation
objects. Plucking IDs is problematic as searching for projects can lead
to a huge amount of IDs being loaded into memory only to be used as an
argument for another query (instead of just using a sub-query).
Gitlab::SearchResults and Gitlab::ProjectSearchResults are libraries we
are going to use to get search results based on query, enitity type and
pagination.
It will allow us to get only issues from project #23 where title or
description includes 'foo'.
Ex:
search_results = Gitlab::ProjectSearchResults.new(project.id, 'foo', 'issues')
search_results.objects => # [<Issues #23>, <Issues #34>]
search_results.issues_count => 2
search_results.total_count => 12 (it includes results from comments and
merge requests too)
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
