python - SQLAlchemy - count status is true -


i have 2 tables in db. 1 named company, other named company_map. company table like:

c_id name  contact 1        12334    2    b     12335 3    c     12336 4    d     12337 5    e     12338

company_map table like:

m_id c_id  status 1     1     true    2     1     false 3     1     true 4     3     true 5     3     true

i need count number status true in company_map table, group c_id. example, need number of c_id 1 , status true, should 2. can number of c_id now, use func.count(company_map.c_id), 3. how count status == true()? try method, none work.

i got idea sqlalchemy func.count on boolean column

.having(func.count(case([(company_map.status, 1)])) < func.count(company_map.c_id))

if sqlalchemy latest version, can use 

.having(func.count(1).filter(company_map.status))

which cleaner old.


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