noosfero | Fixes community search when spreading content with SubOrgPlugin enabled (!1184)

[Gabriel Silva]

New Merge Request !1184

https://gitlab.com/noosfero/noosfero/merge_requests/1184

Project:Branches: gabrielssilva/noosfero:fix_spread_search to noosfero/noosfero:master
Author:    Gabriel Silva
Assignee:  

Fixes #256 

Postgres requires to specify every column in the select list when using `SELECT DISTINCT` with `ORDER BY`. There is a workaround to order distinct values using a group clause, but it breaks when the sub organizations plugin is active, since the latter adds a scope that would require every column in the group aggregation list.

To avoid this issue, this patch removes the `group` scope and filters duplicated results using Ruby code.


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