Sqlalchemy：查询 - 当所有孩子满足不平等条件时，只获得父母

Question

i am new with databases and sqlalchemy and i am trying to make a query using an inequality condition, but it always return the parent aslong as one of the childs satisfy the condition and i need all the childs satisfy that inequality

My current tables:

class Jefe(Base):
    """ Tabla de jefes"""

    __tablename__ = 'jefe'

    id = Column(Integer, primary_key=True)
    nombre = Column(String, unique=True)
    empleado = relationship('Empleado', backref='jefe', cascade='all, delete-orphan')


class Empleado(Base):
    """ Tabla de empleados"""

    __tablename__ = 'empleado'

    id = Column(Integer, primary_key=True)
    jefe_id = Column(Integer, ForeignKey('jefe.id'), nullable=False)
    nombre = Column(String, unique=True)
    salario = Column(Float)

my actual query:

result = Session.query(Jefe).join(Empleado).filter(Empleado.salario > 120).all()

which output is:

Jefe: Yehender carrasco --- id: 1 
 ----------- Empleados
 ----------- nombre: Jesus ramirez --- salario: 150.00 --- id: 1
 ----------- nombre: Erlinda pereira --- salario: 130.00 --- id: 2


Jefe: Kleiver carrasco --- id: 2 
 ----------- Empleados
 ----------- nombre: Jesus carvajal --- salario: 155.00 --- id: 3
 ----------- nombre: Victor araujo --- salario: 135.00 --- id: 4
 ----------- nombre: Cristhiam ochoa --- salario: 105.00 --- id: 9


Jefe: Ivan marquez --- id: 4 
 ----------- Empleados
 ----------- nombre: Eliana ortega --- salario: 145.00 --- id: 7
 ----------- nombre: Sofia marquez --- salario: 133.30 --- id: 8

And I want the second result not to appear given that cristhiam ochoa's salary is less than 120, like this:

Jefe: Yehender carrasco --- id: 1 
 ----------- Empleados
 ----------- nombre: Jesus ramirez --- salario: 150.00 --- id: 1
 ----------- nombre: Erlinda pereira --- salario: 130.00 --- id: 2


Jefe: Ivan marquez --- id: 4 
 ----------- Empleados
 ----------- nombre: Eliana ortega --- salario: 145.00 --- id: 7
 ----------- nombre: Sofia marquez --- salario: 133.30 --- id: 8

I know that I have to modify the filtering condition so that all the children are taken into account, but I do not know how to do it

Answer 1

You're not setting up your join properly. Try this:

result = Session.query(Jefe).join(Jefe.empleado).filter(Empleado.salario > 120).all()