Source code for tendril.validation.columns
#!/usr/bin/env python
# encoding: utf-8
# Copyright (C) 2016-2019 Chintalagiri Shashank
#
# This file is part of tendril.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Columns Validation Patterns (:mod:`tendril.validation.columns`)
===============================================================
"""
from tendril.validation.base import ValidationError
from tendril.validation.base import ValidationPolicy
[docs]class RequiredColumnMissingError(ValidationError):
msg = "Required Column Missing"
def __init__(self, policy, missing_column):
super(RequiredColumnMissingError, self).__init__(policy)
self._missing_column = missing_column
def __repr__(self):
return "<Required Column Missing {0} {1}>".format(
self._policy.context, self._missing_column
)
[docs] def render(self):
return {
'is_error': self.policy.is_error,
'group': self.msg,
'headline': "Required Column Missing",
'detail': "{0}, Required Columns {1}"
"".format(self._policy.context.render(),
self._policy.required_columns),
}
[docs]class ColumnsRequiredPolicy(ValidationPolicy):
def __init__(self, context, required_columns):
super(ColumnsRequiredPolicy, self).__init__(context)
self.is_error = False
self._required_columns = required_columns
@property
def required_columns(self):
return self._required_columns
[docs] def check(self, columns):
for cname in self._required_columns:
if cname not in columns:
raise RequiredColumnMissingError(self, cname)