作者：清澈小溪- | 来源：互联网 | 2023-10-13 11:15
I want to support a field called "from", but I can't do this in marshmallow because it would cause a syntax error:
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| python
class MySchema(Schema):
from &＃061; fields.Nested(OtherSchema, attribute&＃061;"my_attribute") |
This got me thinking -- marshmallow is kind of backwards, isn't it? The field that comes in from the outside world is the one that has to be specified as a valid Python identifier, and the field that you're actually going to work with in your code is specified as a string. Shouldn't they be swapped? I'm sure other folks are going to want to parse in or write out a value that isn't a valid Python identifier sometimes.
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| python
class MySchema(Schema):
my_attribute &＃061; fields.Nested(OtherSchema, field&＃061;"from") |
This could even be made backward compatible with existing Marshmallow stuff, like so:
- If neither "field" nor "attribute" are specified, the field and attribute values are both the same as the lvalue, so there's no issue.
- If "attribute" is specified, the lvalue is used for "field"
- if "field" is specified, the lvalue is used for "attribute"
Probably harder for you to actually implement this sorta thing though, but it's a thought.
该提问来源于开源项目：marshmallow-code/marshmallow
Is there a way to disallow fields which are python identifiers when allowing unknown keys?
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| class OrderLabelSchema(marshmallow.Schema):
class Meta:
unknown &＃061; marshmallow.INCLUDE
discriminator &＃061; marshmallow.fields.Str(
required&＃061;True, validate&＃061;marshmallow.validate.OneOf(base.TYPES)
)
class OrderSchema(marshmallow.Schema):
class Meta: fields &＃061; (
&＃039;created_at&＃039;,
&＃039;updated_at&＃039;,
&＃039;id&＃039;,
&＃039;labels&＃039;,
&＃039;status&＃039;,
)
labels &＃061; marshmallow.fields.Nested(OrderLabelSchema)
status &＃061; marshmallow.fields.Str(
validate&＃061;marshmallow.validate.OneOf(STATUSES)
) |
I ended up writing my own validator, but I was thinking this might not be the correct approach:
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| .pre_load
def validate_keys(self, data, **kwargs):
errors &＃061; {
k: [&＃039;Invalid identifier provided.&＃039;]
for k, _ in data.items()
if not k.isidentifier()
}
if errors:
raise marshmallow.exceptions.ValidationError(errors)
return data |
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