serialization

问题 I have an object that has optional fields. I have defined my serializer this way: class ProductSerializer(serializers.Serializer): code = serializers.Field(source="Code") classification = serializers.CharField(source="Classification", required=False) I thought required=False would do the job of bypassing the field if it doesn't exist. However, it is mentioned in the documentation that this affects deserialization rather than serialization. I'm getting the following error: 'Product' object has

问题 I have an object that has optional fields. I have defined my serializer this way: class ProductSerializer(serializers.Serializer): code = serializers.Field(source="Code") classification = serializers.CharField(source="Classification", required=False) I thought required=False would do the job of bypassing the field if it doesn't exist. However, it is mentioned in the documentation that this affects deserialization rather than serialization. I'm getting the following error: 'Product' object has

问题 I have tried implementing cross platform serialization between Java and Android. I have used Serializable, and having my code in Android in the same package as in desktop Java. Source: java-desktop serializing Student student=new Student(); student.setName("John"); student.setSurname("Brown"); student.setNumber(776012345); try { FileOutputStream fout = new FileOutputStream("thestudent.dat"); ObjectOutputStream oos = new ObjectOutputStream(fout); oos.writeObject(student); oos.close(); } catch

问题 In Django REST framework, what is involved in creating a flat, read-write serializer representation? The docs refer to a 'flat representation' (end of the section http://django-rest-framework.org/api-guide/serializers.html#dealing-with-nested-objects) but don't offer examples or anything beyond a suggestion to use a RelatedField subclass. For instance, how to provide a flat representation of the User and UserProfile relationship, below? # Model class UserProfile(models.Model): user = models

问题 In Django REST framework, what is involved in creating a flat, read-write serializer representation? The docs refer to a 'flat representation' (end of the section http://django-rest-framework.org/api-guide/serializers.html#dealing-with-nested-objects) but don't offer examples or anything beyond a suggestion to use a RelatedField subclass. For instance, how to provide a flat representation of the User and UserProfile relationship, below? # Model class UserProfile(models.Model): user = models

问题 In Django REST framework, what is involved in creating a flat, read-write serializer representation? The docs refer to a 'flat representation' (end of the section http://django-rest-framework.org/api-guide/serializers.html#dealing-with-nested-objects) but don't offer examples or anything beyond a suggestion to use a RelatedField subclass. For instance, how to provide a flat representation of the User and UserProfile relationship, below? # Model class UserProfile(models.Model): user = models

问题 class MyClass implements Serializable { transient int myTransient; //Other variables } When I restore this class I want to initialize myTransient manually, but otherwise I just want to use the default serialization. How can I inject an init() method into the object restore process without re-writing the entire serialization mechanism as it seems like Externalizable would have me do? 回答1: Implement a readObject() method: private void readObject(java.io.ObjectInputStream in) throws IOException,

问题 I ve got a strange php behaviour with floating value $array_test["test"]= round($value,2); //first I round up a value echo $array_test["test"]; //0,66 $s_array_test= serialize($array_test); //serializing the array var_dump($s_array_test) // (...)s:4:"test";d:0.66000000000000003108624468950438313186168670654296875;}(...) This is pretty annoying cause the serialized array is stored into a db a use more space... How to fix this ? thx 回答1: First of all read the section about floats in the manual

问题 I have this before the process: protected void onPostExecute(SortedSet<RatedMessage> result) { List<Object> list=Arrays.asList(result.toArray()); lancon.putExtra("results", list.toArray()); // as serializable } then in the other part I have Object o=this.getIntent().getSerializableExtra("results"); //at this point the o holds the correct value (checked by debugger) RatedMessage[] rm = (RatedMessage[]) o;// this line hangs out w ClassCastException resultSet = new TreeSet<RatedMessage>(new Comp

问题 I have a object of Type Node. Node.cs The serialization works when I make the call as following: var nodeSer = JsonConvert.SerializeObject(mynode, Formatting.Indented, new JsonSerializerSettings { PreserveReferencesHandling = PreserveReferencesHandling.Objects }); My problem is that the following call does not work. var n = JsonConvert.DeserializeObject<Node>(nodeSer, new JsonSerializerSettings { PreserveReferencesHandling = PreserveReferencesHandling.Objects, TypeNameHandling =