123 lines
2.9 KiB
Python
123 lines
2.9 KiB
Python
from cqlengine.exceptions import CQLEngineException
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from cqlengine.query import AbstractQueryableColumn, SimpleQuerySet
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from cqlengine.query import DoesNotExist as _DoesNotExist
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from 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 '"{}"'.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): pass
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class MultipleObjectsReturned(_MultipleObjectsReturned): 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 '{}.{}'.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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