Producer.__add__()#

relationalai
#Producer.__add__(other: Any) -> Expression

Returns an Expression that produces the sum of the Producer values and other.

Parameters#

NameTypeDescription
otherAnyA numeric value or another Producer object.

Returns#

An Expression object.

Example#

You may sum a Producer with a number literal:

#import relationalai as rai

model = rai.Model("people")
Person = model.Type("Person")

with model.rule():
    Person.add(name="Fred", age=39)
    Person.add(name="Wilma", age=36)

with model.query() as select:
    person = Person()
    # `person.age` returns an `InstanceProperty` object,
    # which is also a `Producer` object.
    age_after_next_birthday = person.age + 1
    response = select(person.name, age_after_next_birthday)

print(response.results)
# Output:
#     v
#     name   v
# 0   Fred  40
# 1  Wilma  37

You may also sum two Producer objects:

#with model.rule():
    fred = Person(name="Fred")
    fred.set(cash=100.0, savings=200.0)

with model.rule():
    wilma = Person(name="Wilma")
    wilma.set(cash=90.0, savings=310.0)

with model.query() as select:
    person = Person()
    # `person.cash` and `person.savings` return `InstanceProperty`
    # objects, which are also `Producer` objects.
    total_assets = person.cash + person.savings
    response = select(person.name, total_assets)

print(response.results)
# Output:
#     name      v
# 0   Fred  300.0
# 1  Wilma  400.0

See Also#