sql - Number of specific associations for model in RoR -


so have model doctor , each doctor has many appointments , each appointment in turn has it's date (as datetime column).

i need show list of, let's 30 doctors, , each doctor, need show number of appoinments or had on 1st of june wonder how that?

the best option can come use nested sql this:

select doctors.*, (select count(*) appointments a.date = 01.06.2014 , a.doctor_id = doctors.id) appointments_number doctors;

(i know date not filled correctly lazy google right way, doesnt matter)

so, there easier way it?

group columns of doctors table want select , add count

select d.id, d.name, count(a.id) appointments from doctors d join appointments on a.doctor_id = d.id a.date = '2014-06-01' group d.id, d.name

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