<p>在遇到同样的问题后,我找到了一个解决办法,希望这能对一些人有所帮助。我修改了定义为<a href="http://www.django-rest-framework.org/api-guide/serializers/#dynamically-modifying-fields" rel="nofollow noreferrer">here</a>的DynamicFieldsModelSerializer</p>
<pre><code>def __init__(self, *args, **kwargs):
# Don't pass the 'fields' arg up to the superclass
fields = kwargs.pop('fields', None)
nested = kwargs.pop('nested', None)
# Instantiate the superclass normally
super(DynamicFieldsModelSerializer, self).__init__(*args, **kwargs)
if fields is not None:
# Drop any fields that are not specified in the `fields` argument.
allowed = set(fields)
existing = set(self.fields.keys())
for field_name in existing - allowed:
self.fields.pop(field_name)
if nested is not None:
for serializer in nested:
try:
nested_serializer = self.fields[serializer]
except:
logger.warning("Wrong nested serializer name")
continue
allowed = set(nested[serializer])
existing = set(nested_serializer.fields.keys())
for field_name in existing - allowed:
nested_serializer.fields.pop(field_name)
</code></pre>
<p>之后,您可以这样使用它:</p>
^{pr2}$
<p>您可以修改我的解决方案以使用双下划线,而不是另一个带有dict的kewyord,但我希望将常规字段与嵌套序列化程序分开。在</p>
<p>它也可以改进为递归的,这里我只处理一个嵌套序列化器的深度</p>
<p>编辑
我修改了代码,使用了双下划线语法:</p>
<pre><code>def __init__(self, *args, **kwargs):
def parse_nested_fields(fields):
field_object = {"fields": []}
for f in fields:
obj = field_object
nested_fields = f.split("__")
for v in nested_fields:
if v not in obj["fields"]:
obj["fields"].append(v)
if nested_fields.index(v) < len(nested_fields) - 1:
obj[v] = obj.get(v, {"fields": []})
obj = obj[v]
return field_object
def select_nested_fields(serializer, fields):
for k in fields:
if k == "fields":
fields_to_include(serializer, fields[k])
else:
select_nested_fields(serializer.fields[k], fields[k])
def fields_to_include(serializer, fields):
# Drop any fields that are not specified in the `fields` argument.
allowed = set(fields)
existing = set(serializer.fields.keys())
for field_name in existing - allowed:
serializer.fields.pop(field_name)
# Don't pass the 'fields' arg up to the superclass
fields = kwargs.pop('fields', None)
# Instantiate the superclass normally
super(DynamicFieldsModelSerializer, self).__init__(*args, **kwargs)
if fields is not None:
fields = parse_nested_fields(fields)
# Drop any fields that are not specified in the `fields` argument.
select_nested_fields(self, fields)
</code></pre>
<p>然后您可以这样使用它:</p>
<pre><code>SerializerOne(instance, fields=["another_field__name"])
</code></pre>