如何将JSON序列化到django / python中的模型对象列表 [英] How to serialize to JSON a list of model objects in django/python
问题描述
class AnalysisInput(models.Model):
input_user = models.CharField(max_length = 45)
input_title = models.CharField(max_length = 45)
input_date = models.DateTimeField()
input_link = models.CharField(max_length = 100 )
我为json.dumps()编写了一个自定义序列化器(编码器):
class AnalysisInputEncoder(json.JSONEncoder):
def default(self,obj):
if isinstance(obj,AnalysisInput) :
return {input_id:obj.id,
input_user:obj.input_user,
input_title:obj.input_title,
input_date:obj.input_date .isoformat(),
input_link:obj.input_link}
return json.JSONEncoder.default(self,obj)
当我只序列化一个对象时,我能够做到这一点当我尝试序列化一个对象列表时,我得到
[objects ..]不是JSON可序列化
我搜索,但没有找到在哪里工作..我正在考虑编写一个自定义序列化器也列出模型
定制编码器不是递归调用。您实际上更好的使用自定义编码器,而不是使用自定义编码器,而是在序列化之前将对象转换为简单的python类型。
您可以添加一个 as_json
或类似命名的方法,并在每次需要JSON结果时调用该方法:
code> class AnalysisInput(models.Model):
input_user = models.CharField(max_length = 45)
input_title = models.CharField(max_length = 45)
input_date = models.DateTimeField ()
input_link = models.CharField(max_length = 100)
def as_json(self):
return dict(
input_id = self.id,input_user = self .input_user,
input_title = self.input_title,
input_date = self.input_date.isoformat(),
input_link = self.input_link)
然后在您的视图中:
#one result
return HttpResponse(json.dumps(result.as_json()),content_type =appl ation / json)
#一个结果列表
results = [ob.as_json()for ob在结果集中]
return HttpResponse(json.dumps(results),content_type =application / json)
I am trying to serialize a list of model object defined as:
class AnalysisInput(models.Model):
input_user = models.CharField(max_length=45)
input_title = models.CharField(max_length=45)
input_date = models.DateTimeField()
input_link = models.CharField(max_length=100)
I wrote a custom serializer (encoder) for json.dumps():
class AnalysisInputEncoder(json.JSONEncoder):
def default(self, obj):
if isinstance(obj, AnalysisInput):
return { "input_id" : obj.id,
"input_user" : obj.input_user,
"input_title" : obj.input_title,
"input_date" : obj.input_date.isoformat(),
"input_link" : obj.input_link }
return json.JSONEncoder.default(self, obj)
When I serialize only one object, I am able to do it. When I try to serialize a list of object I get
[ objects..] is not JSON serializable
I searched but I didn't find where to work on.. I was thinking about writing a custom serializer also for list of model object.
A custom encoder is not called recursively. You are actually better off not using a custom encoder, and instead convert your objects to simple python types before serializing.
You could add a as_json
or similarly named method to your model and calling that every time you need a JSON result:
class AnalysisInput(models.Model):
input_user = models.CharField(max_length=45)
input_title = models.CharField(max_length=45)
input_date = models.DateTimeField()
input_link = models.CharField(max_length=100)
def as_json(self):
return dict(
input_id=self.id, input_user=self.input_user,
input_title=self.input_title,
input_date=self.input_date.isoformat(),
input_link=self.input_link)
Then in your view:
# one result
return HttpResponse(json.dumps(result.as_json()), content_type="application/json")
# a list of results
results = [ob.as_json() for ob in resultset]
return HttpResponse(json.dumps(results), content_type="application/json")
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