Cumulative amount of events will trigger fraud detection

[jaballe]

Hello,

How do I create a rule that can detect that sums up the amount of x number of events and if it hits a certain number threshold, it will be detected for example:
like so
with ruleset('accumulated_fraud_detection'):
@when_all(accumulate(amount_sum=lambda ev: ev.amount) > 1000)
def fraud_detected(c):
print('Fraud detected! Total amount: {0}'.format(c.events[-1].amount))

post('evnt_amount', { 'amount': 100 })
 post('evnt_amount', { 'amount': 200 })

post('evnt_amount', { 'amount': 500 })
post('evnt_amount', { 'amount': 100 })
post('evnt_amount', { 'amount': 101})

[mathrep]

Do you mean something like the following?
`
from durable.lang import *

with ruleset('accumulated_fraud_detection'):

@when_all(+m.amount)
def accumulate_amount(c):
    if c.s.total_amount is None:
        c.s.total_amount = 0
    
    c.s.total_amount += c.m.amount
    print(f"Current total amount: {c.s.total_amount}")
    
    if c.s.total_amount > 1000:
        print(f"Fraud detected! Total amount: {c.s.total_amount}")
        # Reset the total amount or some other actions
        c.s.total_amount = 0 

post('accumulated_fraud_detection', { 'amount': 100 })
post('accumulated_fraud_detection', { 'amount': 200 })
post('accumulated_fraud_detection', { 'amount': 500 })
post('accumulated_fraud_detection', { 'amount': 100 })
post('accumulated_fraud_detection', { 'amount': 101 })
`
This code will print out

Current total amount: 100
Current total amount: 300
Current total amount: 800
Current total amount: 900
Current total amount: 1001
Fraud detected! Total amount: 1001