Constrain payday payouts

[rohitpaulk]

#3415 (comment)
#3396

[chadwhitacre]

@rohitpaulk Is it obvious to you why 62fe524 is failing?

[chadwhitacre]

I get:

_____________________________________ TestPayout.test_payout_can_pay_out _____________________________________
Traceback (most recent call last):
  File "/Users/whit537/personal/gratipay/gratipay.com/env/lib/python2.7/site-packages/mock.py", line 1201, in patched
    return func(*args, **keywargs)
  File "/Users/whit537/personal/gratipay/gratipay.com/tests/py/test_billing_payday.py", line 523, in test_payout_can_pay_out
    Payday.start().payout()
  File "/Users/whit537/personal/gratipay/gratipay.com/gratipay/billing/payday.py", line 444, in payout
    self.db.self_check()
  File "/Users/whit537/personal/gratipay/gratipay.com/gratipay/models/__init__.py", line 31, in self_check
    check_db(cursor)
  File "/Users/whit537/personal/gratipay/gratipay.com/gratipay/models/__init__.py", line 37, in check_db
    _check_balances(cursor)
  File "/Users/whit537/personal/gratipay/gratipay.com/gratipay/models/__init__.py", line 120, in _check_balances
    assert len(b) == 0, "conflicting balances: {}".format(b)
AssertionError: conflicting balances: [Record(username=u'alice', expected=Decimal('-20.00'), actual=Decimal('0.00'))]

[rohitpaulk]

Is it obvious to you why 62fe524 is failing?

Yes, we created a participant with a positive balance, but didn't create a corresponding exchange.

[rohitpaulk]

Fixing...

[chadwhitacre]

Ah, like pry for ruby :)

:)

[chadwhitacre]

!m @rohitpaulk

Okay! Back to #3415 ...