issue_comments: 507749287

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https://github.com/pydata/xarray/issues/3018#issuecomment-507749287 https://api.github.com/repos/pydata/xarray/issues/3018 507749287 MDEyOklzc3VlQ29tbWVudDUwNzc0OTI4Nw== 2448579 2019-07-02T16:23:57Z 2019-07-02T16:23:57Z MEMBER

OK looks like the method was added to the DataArrayGroupBy class not GroupBy. I should've caught this at review. Just moving the function definition to GroupBy seems to make things work

 
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