The table in question has a field:

    Field('Paiddate', 'date', requires = [IS_EMPTY_OR(IS_DATE()), 
IS_EMPTY_OR(IS_MEMBERSHIP_YEAR_END())]),

The custom validator is:

class IS_MEMBERSHIP_YEAR_END(object):
    def __init__(self, error_message='Not a membership year end'):
        self.error_message = error_message
    def __call__(self, value):
        yearend = datetime.date(2018,9,30)
        if value.month==yearend.month and value.day==yearend.day:
            return (value, None)
        return (value, self.error_message)

This works in 2.17.2

I updated my test environment to 2.18.4 and it fails.

On the console I see:

web2py Web Framework
Created by Massimo Di Pierro, Copyright 2007-2019
Version 2.18.4-stable+timestamp.2019.03.13.05.27.54
Database drivers available: sqlite3, imaplib, pyodbc, pymysql
please visit:
('\t', 'http://127.0.0.1:8000/')
starting browser...
Traceback (most recent call last):
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\gluon\html.py", line 1890, in _validate
    (value, errors) = validator(value)
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\gluon\packages\dal\pydal\validators.py", line 144, in 
__call__
    return self.validate(value), None
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\gluon\packages\dal\pydal\validators.py", line 2754, in 
validate
    return self.other.validate(value)
AttributeError: 'IS_MEMBERSHIP_YEAR_END' object has no attribute 'validate'

The ticket shows:

Error ticket for "init" Ticket ID 

127.0.0.1.2019-04-04.16-41-08.0dce185d-d8d2-4d36-9e47-8c82bc1d54f5
<type 'exceptions.Exception'> Validation error, field:Paiddate 
<pydal.validators.IS_EMPTY_OR object at 0x0000000004878048> Version 
web2py™ Version 2.18.4-stable+timestamp.2019.03.13.05.27.54 
Python Python 2.7.14: C:\Python27\python.exe (prefix: C:\Python27) Traceback 

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Traceback (most recent call last):
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\gluon\restricted.py", line 219, in restricted
    exec(ccode, environment)
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\applications\init\controllers/default.py", line 1747, in 
<module>
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\gluon\globals.py", line 421, in <lambda>
    self._caller = lambda f: f()
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\applications\init\models\db.py", line 109, in wrapped_f
    return f(*args)
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\applications\init\controllers/default.py", line 214, in 
memberform
    deletable = dltbl, onvalidation=setmodified, onaccept=modmember, 
ondelete=delmember)
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\gluon\tools.py", line 4322, in update
    detect_record_change=self.settings.detect_record_change):
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\gluon\sqlhtml.py", line 1758, in accepts
    **kwargs
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\gluon\html.py", line 2149, in accepts
    status = self._traverse(status, hideerror)
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\gluon\html.py", line 910, in _traverse
    newstatus = c._traverse(status, hideerror) and newstatus
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\gluon\html.py", line 910, in _traverse
    newstatus = c._traverse(status, hideerror) and newstatus
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\gluon\html.py", line 910, in _traverse
    newstatus = c._traverse(status, hideerror) and newstatus
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\gluon\html.py", line 910, in _traverse
    newstatus = c._traverse(status, hideerror) and newstatus
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\gluon\html.py", line 917, in _traverse
    newstatus = self._validate()
  File "C:\Users\David\Google Drive\Oxcamne Archive\Web 
Site\OxCamNE.2.1\gluon\html.py", line 1895, in _validate
    raise Exception(msg)
Exception: Validation error, field:Paiddate <pydal.validators.IS_EMPTY_OR 
object at 0x0000000004878048>

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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