f7fac976d8
https://datastax-oss.atlassian.net/browse/PYTHON-288 Add Python 2.6 compliancy: - Remove dict/set comprehensions. - Use cassandra's OrderedDict. - Replace str.format() implicit placeholders ('{}') with explicit ones ('{0} {1} ...'). - Implement cqlengine.functions.get_total_seconds() as alternative to timedelta.total_seconds(). cqlengine integration tests remain to be backported.
139 lines
3.5 KiB
Python
139 lines
3.5 KiB
Python
# Copyright 2015 DataStax, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from cassandra.cqlengine import CQLEngineException
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from cassandra.cqlengine.query import AbstractQueryableColumn, SimpleQuerySet
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from cassandra.cqlengine.query import DoesNotExist as _DoesNotExist
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from cassandra.cqlengine.query import MultipleObjectsReturned as _MultipleObjectsReturned
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class QuerySetDescriptor(object):
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"""
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returns a fresh queryset for the given model
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it's declared on everytime it's accessed
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"""
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def __get__(self, obj, model):
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""" :rtype: ModelQuerySet """
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if model.__abstract__:
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raise CQLEngineException('cannot execute queries against abstract models')
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return SimpleQuerySet(obj)
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def __call__(self, *args, **kwargs):
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"""
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Just a hint to IDEs that it's ok to call this
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:rtype: ModelQuerySet
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"""
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raise NotImplementedError
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class NamedColumn(AbstractQueryableColumn):
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"""
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A column that is not coupled to a model class, or type
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"""
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def __init__(self, name):
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self.name = name
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def __unicode__(self):
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return self.name
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def _get_column(self):
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""" :rtype: NamedColumn """
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return self
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@property
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def db_field_name(self):
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return self.name
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@property
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def cql(self):
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return self.get_cql()
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def get_cql(self):
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return '"{0}"'.format(self.name)
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def to_database(self, val):
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return val
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class NamedTable(object):
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"""
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A Table that is not coupled to a model class
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"""
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__abstract__ = False
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objects = QuerySetDescriptor()
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class DoesNotExist(_DoesNotExist):
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pass
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class MultipleObjectsReturned(_MultipleObjectsReturned):
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pass
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def __init__(self, keyspace, name):
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self.keyspace = keyspace
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self.name = name
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def column(self, name):
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return NamedColumn(name)
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def column_family_name(self, include_keyspace=True):
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"""
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Returns the column family name if it's been defined
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otherwise, it creates it from the module and class name
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"""
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if include_keyspace:
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return '{0}.{1}'.format(self.keyspace, self.name)
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else:
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return self.name
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def _get_column(self, name):
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"""
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Returns the column matching the given name
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:rtype: Column
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"""
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return self.column(name)
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# def create(self, **kwargs):
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# return self.objects.create(**kwargs)
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def all(self):
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return self.objects.all()
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def filter(self, *args, **kwargs):
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return self.objects.filter(*args, **kwargs)
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def get(self, *args, **kwargs):
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return self.objects.get(*args, **kwargs)
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class NamedKeyspace(object):
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"""
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A keyspace
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"""
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def __init__(self, name):
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self.name = name
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def table(self, name):
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"""
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returns a table descriptor with the given
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name that belongs to this keyspace
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"""
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return NamedTable(self.name, name)
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