def deconvert(self, value):
'''Changes a stored Reference to its Model'''
if value is None: return None
dict = yaml.load(value)
assert "id" in dict and "keyspace" in dict and "kind" in dict, "Homer cannot load an invalid reference"
clasz = MetaModel.discover(dict["kind"])
return MetaModel(clasz).read(dict["id"])
def save(self, unique=False):
"""Stores this Model in Cassandra in one batch update."""
from homer.core.types import TypedCollection
model = MetaModel(self)
if model.created:
model.update()
else:
model.new(unique)
properties = fields(self, CqlProperty)
for name, property in properties.items(): #Commit the changes in all collections within this model.
if isinstance(property, CqlCollection):
value = self[name]
if isinstance(value, TypedCollection):
value.commit()
self.differ.commit() #Commit the differ for the model finally.
self.__saved = True #Mark this model as saved.
def validate(self, value):
'''Makes sure you can only set a Model or a Key that is complete on a Reference'''
if self.empty(value):
return None
if isinstance(self.clasz, str):
found = MetaModel.discover(self.clasz)
if found: self.clasz = found
if not isinstance(value, (self.clasz, Model)):
raise BadValueError("Value: {0} must be an instance of {1}".format(value, self.clasz))
value.validate() #Finally validate the model then return it.
return value