Group_by example in MongoMapper
This is simple way to make a request on a column grouping in MongoMapper like as GROUP_BY in SQL:

seen from Türkiye
seen from United States
seen from China
seen from United States

seen from United States

seen from United States
seen from Türkiye
seen from Denmark
seen from United States

seen from United States
seen from Belgium
seen from United States

seen from United States
seen from United States

seen from Bulgaria

seen from United States
seen from Belgium
seen from Poland
seen from Germany
seen from United States
Group_by example in MongoMapper
This is simple way to make a request on a column grouping in MongoMapper like as GROUP_BY in SQL: