Dacey made over 200 appearances for Cardiff after joining them from Pontypridd in 2010 and won eight caps for Wales between 2015 and 2017.
A youthful Leinster team maintained their BKT United Rugby Championship table-topping form with a 38-14 win over Cardiff at the RDS.
Cardiff ran in seven tries to thrash Brive on the opening weekend of the European Challenge Cup and end the winless run of Welsh clubs in Europe.
Cardiff inflicted a first defeat of the United Rugby Championship season on defending champions the Stormers with a thrilling 30-24 win in Wales.
Glasgow bounced back from their opening-round defeat at Benetton by racking up eight tries in a 52-24 bonus-point victory over Cardiff at Scotstoun.
Cardiff kicked off their new URC campaign with a first victory over Munster in four years, winning 20-13 at the Arms Park despite an injury to new signing Liam Williams.
Cardiff paid for a slow start as they suffered a 37-20 United Rugby Championship defeat to the Lions in Johannesburg.
At 33, Josh Turnbull had a Wales call-up after three years in the wilderness. It is just reward for hard graft
Josh Turnbull was the hero for Cardiff Blues with a late try to secure derby bragging rights against the Dragons at Rodney Parade.
