ruby - Rails nested group and count with column renaming -


i have model looks way:

issue(id, ..., tracker_id)                    |           tracker(id, ..., name) 
issue has_one :tracker tracker has_many :issues

and number of issues per tracker. have got is:

issue.group(:tracker_id).count => {3=>446, 5=>247, 9=>2, 11=>560}

but instead of grouping tracker_id, group tracker_name, this:

{"name_1"=>446, "name_2"=>247, "name_3"=>2, "another_name"=>560}

is there way directly, without mapping operation / hash renaming ?

there way:

issue.joins(:tracker).group('trackers.name').count

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