def to_python(self, value):
"""
Excerpt from `Django doc
<https://docs.djangoproject.com/en/dev/howto/custom-model-fields/#django.db.models.Field.to_python>`__:
As a general rule, the method should deal gracefully with any of the following arguments:
- An instance of the correct type (e.g., Hand in our ongoing example).
- A string (e.g., from a deserializer).
- Whatever the database returns for the column type you’re using.
I'd add "Any value specified for this field when instantiating a model."
>>> to_python(None)
>>> to_python(30)
>>> to_python(30L)
>>> to_python('')
>>> to_python(Decimal(0))
"""
if isinstance(value, Decimal):
return value
if value:
if isinstance(value, basestring):
return quantities.parse(value)
return Decimal(value)
return None
def to_python(self, value):
"""
Excerpt from `Django docs
<https://docs.djangoproject.com/en/1.11/howto/custom-model-fields/#converting-values-to-python-objects>`__:
As a general rule, the method should deal gracefully with
any of the following arguments:
- An instance of the correct type (e.g., Hand in our ongoing example).
- A string (e.g., from a deserializer).
- Whatever the database returns for the column type you’re using.
I'd add "Any value potentially specified for this field when instantiating
a model."
>>> to_python(None)
>>> to_python(30)
>>> to_python(30L)
>>> to_python('')
>>> to_python(Decimal(0))
"""
if isinstance(value, Decimal):
return value
if value:
# try:
if isinstance(value, six.string_types):
return quantities.parse(value)
return Decimal(value)
# except Exception as e:
# raise ValidationError(
# "Invalid value {} for {} : {}".format(value, self, e))
return None
def to_python(self, value):
"""
Excerpt from `Django doc
<https://docs.djangoproject.com/en/dev/howto/custom-model-fields/#django.db.models.Field.to_python>`__:
As a general rule, the method should deal gracefully with
any of the following arguments:
- An instance of the correct type (e.g., Hand in our ongoing example).
- A string (e.g., from a deserializer).
- Whatever the database returns for the column type you’re using.
I'd add "Any value specified for this field when instantiating
a model."
>>> to_python(None)
>>> to_python(30)
>>> to_python(30L)
>>> to_python('')
>>> to_python(Decimal(0))
"""
if isinstance(value, Decimal):
return value
if value:
if isinstance(value, six.string_types):
return quantities.parse(value)
return Decimal(value)
return None
def to_python(self, value):
"""
Excerpt from `Django docs
<https://docs.djangoproject.com/en/1.11/howto/custom-model-fields/#converting-values-to-python-objects>`__:
As a general rule, the method should deal gracefully with
any of the following arguments:
- An instance of the correct type (e.g., Hand in our ongoing example).
- A string (e.g., from a deserializer).
- Whatever the database returns for the column type you’re using.
I'd add "Any value potentially specified for this field when instantiating
a model."
>>> to_python(None)
>>> to_python(30)
>>> to_python(30L)
>>> to_python('')
>>> to_python(Decimal(0))
"""
if isinstance(value, Decimal):
return value
if value:
# try:
if isinstance(value, six.string_types):
return quantities.parse(value)
return Decimal(value)
# except Exception as e:
# raise ValidationError(
# "Invalid value {} for {} : {}".format(value, self, e))
return None
def from_db_value(self, value, expression, connection, context):
return quantities.parse(value) if value else self.get_default()
def from_db_value(self, value, expression, connection, context):
return quantities.parse(value) if value else self.get_default()
