starts_with()#
relationalai.std.strings
#starts_with(string: str|Producer, prefix: str|Producer) -> Expression
Checks if a string begins with a prefix. Must be called in a rule or query context.
Parameters#
Name | Type | Description |
---|---|---|
string | Producer | A producer that produces string values. |
prefix | str or Producer | The substring to check for. |
Returns#
An Expression
object.
Example#
#import relationalai as rai
from relationalai.std.strings import starts_with
# =====
# SETUP
# =====
# Create a model named "people" with a Person type.
model = rai.Model("people")
Person = model.Type("Person")
# Add some people to the model.
with model.rule():
Person.add(name="Alice")
Person.add(name="Bob")
# =======
# EXAMPLE
# =======
# Get all people whose name starts with "A".
with model.query() as select:
person = Person()
starts_with(person.name, "A")
response = select(person.name)
print(response.results)
# name
# 0 Alice