Heroku PostgreSQL GROUP_BY error in Rails app

Question

I\'ve got a rails app that works fine in development (SQLite) but is throwing lots of errors when I\'ve deployed it via Heroku, which uses PostgreSQL I gather.

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Answer 1

You need to group by all the columns in the select list, so

.group("practices.id, practices.foo, practices.bar, ..., DATE(created_at)")

Your idea to group only by id is sound (assuming id is the primary key), but PostgreSQL will only support that in version 9.1.

Answer 2

Practice.joins(:foobar).group_all

def self.group_all
  group(group_all_columns)
end

def self.group_all_columns
  @group_all_columns ||= column_names.collect {|c| "#{table_name}.#{c}"}.join(",")
end

Answer 3

Practice.group(Practice.col_list)



def self.col_list
  Practice.column_names.collect {|c| "practices.#{c}"}.join(",")
end