Rails 3, ActiveRecord, PostgreSQL - “.uniq” command doesn't work?

Question

I have following query:

Article.joins(:themes => [:users]).where([\"articles.user_id != ?\", current_user.id]).order(\"Random()\").limit(15).uniq
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Answer 1

I assume that the .uniq method is translated to a DISTINCT clause on the SQL. PostgreSQL is picky (pickier than MySQL) -- all fields in the select list when using DISTINCT must be present in the ORDER_BY (and GROUP_BY) clauses.

It's a little unclear what you are attempting to do (a random ordering?). In addition to posting the full SQL sent, if you could explain your objective, that might be helpful in finding an alternative.