我正在尝试创建一个枚举字段 https://github.com/5monkeys/django-enumfield在 Django 中,在 GET 请求时将返回枚举的文本表示形式,在 POST 或 PATCH 请求时将在保存之前将文本表示形式转换为相应的整数。
The
transform_<field>()
方法可以很好地将整数枚举值转换为其相应的字符串,但除了破解之外,我找不到更好的方法将字符串转换为相应的整数
validate_<field>()
method.
有更好的方法吗?请看下面的代码
模型文件
class Status(enum.Enum):
RUNNING = 0
COMPLETED = 1
labels = {
RUNNING: 'Running',
COMPLETED: 'Completed'
}
translation = {v: k for k, v in labels.iteritems()}
class Job(models.Model):
status = enum.EnumField(Status)
串行器
class JobSeralizer(serializers.ModelSerailzer):
status = seralizers.CharField(max_length=32, default=Status.QUEUED)
def transform_status(self, obj, value):
return JobStatus.labels[value]
def validate_status(self, attrs, source):
"""Allow status to take numeric or character representation of status
"""
status = attrs[source]
if status in JobStatus.translation:
attrs[source] = JobStatus.translation[status]
elif status.isdigit():
attrs[source] = int(status)
else:
raise serializers.ValidationError("'%s' not a valid status" % status)
return attrs
正如OP所说,你可以使用轻松做到这一点自定义字段 http://www.django-rest-framework.org/api-guide/fields/#custom-fields在 drf v3.x 中。以下是用于转换值 标签(例如枚举值 文本表示)的通用自定义字段的快速示例:
class KeyValueField(serializers.Field):
""" A field that takes a field's value as the key and returns
the associated value for serialization """
labels = {}
inverted_labels = {}
def __init__(self, labels, *args, **kwargs):
self.labels = labels
# Check to make sure the labels dict is reversible, otherwise
# deserialization may produce unpredictable results
inverted = {}
for k, v in labels.iteritems():
if v in inverted:
raise ValueError(
'The field is not deserializable with the given labels.'
' Please ensure that labels map 1:1 with values'
)
inverted[v] = k
self.inverted_labels = inverted
return super(KeyValueField, self).__init__(*args, **kwargs)
def to_representation(self, obj):
if type(obj) is list:
return [self.labels.get(o, None) for o in obj]
else:
return self.labels.get(obj, None)
def to_internal_value(self, data):
if type(data) is list:
return [self.inverted_labels.get(o, None) for o in data]
else:
return self.inverted_labels.get(data, None)
字段初始化看起来像这样:
class MySerializer(serializers.Serializer):
afield = KeyValueField(labels={0:'enum text 0', 1:'enum text 1'})
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