def stringify(self, value):
"""Convert value to string
This method is used to generate a simple JSON representation of the
object (without dereferencing objects etc.)
"""
# SuperModel -> UID
if ISuperModel.providedBy(value):
return str(value)
# DateTime -> ISO8601 format
elif isinstance(value, (DateTime)):
return value.ISO8601()
# Image/Files -> filename
elif safe_hasattr(value, "filename"):
return value.filename
# Dict -> convert_value_to_string
elif isinstance(value, dict):
return {k: self.stringify(v) for k, v in value.iteritems()}
# List -> convert_value_to_string
if isinstance(value, (list, tuple, LazyMap)):
return map(self.stringify, value)
# Callables
elif safe_callable(value):
return self.stringify(value())
elif isinstance(value, unicode):
value = value.encode("utf8")
try:
return str(value)
except (AttributeError, TypeError, ValueError):
logger.warn("Could not convert {} to string".format(repr(value)))
return None
def is_model(self, obj):
"""Check if the given object is a SuperModel
"""
return ISuperModel.providedBy(obj)
def to_list(self, model_or_collection):
if ISuperModel.providedBy(model_or_collection):
return [model_or_collection]
if isinstance(model_or_collection, Sequence):
return model_or_collection
raise TypeError("Need a model or collection")