我遇到了像 3.333333333 这样的 float 问题,我想让它成为 3.33。我不想更改此类值所在的所有 Serializer
类。有上千个序列化程序,它们有多个字段,其值类似于 3.333333333。
能否请您帮我找到猴子修补类型的解决方案,以便我编写一个类或函数来仅转换浮点值。
最佳答案
我编写了一些代码使其正常工作。 我对以下文件进行了更改
settings.py
REST_FRAMEWORK = {
'DEFAULT_RENDERER_CLASSES': (
'utils.renderers.PalJSONRenderer',
'rest_framework.renderers.BrowsableAPIRenderer',
)}
utils/renderers.py
from rest_framework.renderers import JSONRenderer
from rest_framework.utils.encoders import JSONEncoder
from json.encoder import encode_basestring_ascii, encode_basestring, INFINITY, _make_iterencode
class CustomJSONEncoder(JSONEncoder):
def iterencode(self, o, _one_shot=False):
"""Encode the given object and yield each string
representation as available.
For example::
for chunk in JSONEncoder().iterencode(bigobject):
mysocket.write(chunk)
"""
# Hack to enforce
c_make_encoder = None
if self.check_circular:
markers = {}
else:
markers = None
if self.ensure_ascii:
_encoder = encode_basestring_ascii
else:
_encoder = encode_basestring
def floatstr(o, allow_nan=self.allow_nan, _repr=lambda o: format(o, '.2f'), _inf=INFINITY, _neginf=-INFINITY):
# Check for specials. Note that this type of test is processor
# and/or platform-specific, so do tests which don't depend on the
# internals.
if o != o:
text = 'NaN'
elif o == _inf:
text = 'Infinity'
elif o == _neginf:
text = '-Infinity'
else:
return _repr(o)
if not allow_nan:
raise ValueError(
"Out of range float values are not JSON compliant: " +
repr(o))
return text
if (_one_shot and c_make_encoder is not None and self.indent is None):
_iterencode = c_make_encoder(
markers, self.default, _encoder, self.indent,
self.key_separator, self.item_separator, self.sort_keys,
self.skipkeys, self.allow_nan)
else:
_iterencode = _make_iterencode(
markers, self.default, _encoder, self.indent, floatstr,
self.key_separator, self.item_separator, self.sort_keys,
self.skipkeys, _one_shot)
return _iterencode(o, 0)
class PalJSONRenderer(JSONRenderer):
encoder_class = CustomJSONEncoder
关于python - Django Rest Framework Json 数据猴子修补,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35939464/