Drf--- quick start 01

# todo To be sorted out

One . Introduction to serialization components

0. The model object is querySet
1.  serialize : The serializer converts the model object into a dictionary , after response Later it became json character string 
2.  Deserialization : Send the data from the client , after request Later it became a dictionary , The serializer can turn the dictionary into a model 
3.  Deserialization : Complete data verification function 

Two . Quick to use

# urls.py
re_path('books/(?P<pk>\d+)', views.BookView.as_view()),

# views.py
class BookView(APIView):
    def get(self,request,pk):
        book=Book.objects.filter(id=pk).first()
        # With a class , without doubt , Be sure to instantiate 
        # Who do you want to serialize , Just pass someone over 
        book_ser=BookSerializer(book)  #  The calling class __init__
        # book_ser.data    Serializing objects .data It's the dictionary after serialization 
        return Response(book_ser.data)
    

******* The serializer is in charge of itself , Which field do you want to serialize , Just write that  

# ser.py
class BookSerializer(serializers.Serializer):
    # id=serializers.CharField()
    name=serializers.CharField()
    # price=serializers.DecimalField()
    price=serializers.CharField()
    author=serializers.CharField()  
    publish=serializers.CharField()