2) Error:
test_counting_using_sql(HasManyAssociationsTest):
ActiveRecord::StatementInvalid: PGError: ERROR:  subquery must return only one column
: SELECT "companies".id FROM "companies"     WHERE (SELECT * FROM companies WHERE client_of = 1) AND ( ("companies"."type" = 'Client' OR "companies"."type" = 'SpecialClient' OR "companies"."type" = 'VerySpecialClient' ) )  LIMIT 1