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  • django rest framework

    由于前后端分离采用json格式的数据进行交互,rest框架实现了功能强大的序列化器

    model模型

    from django.db import models
    from pygments.lexers import get_all_lexers
    from pygments.styles import get_all_styles
    
    LEXERS = [item for item in get_all_lexers() if item[1]]
    LANGUAGE_CHOICES = sorted([(item[1][0], item[0]) for item in LEXERS])
    STYLE_CHOICES = sorted([(item, item) for item in get_all_styles()])
    
    
    class Snippet(models.Model):
        created = models.DateTimeField(auto_now_add=True)
        title = models.CharField(max_length=100, blank=True, default='')
        code = models.TextField()
        linenos = models.BooleanField(default=False)
        language = models.CharField(choices=LANGUAGE_CHOICES, default='python', max_length=100)
        style = models.CharField(choices=STYLE_CHOICES, default='friendly', max_length=100)
    
        class Meta:
            ordering = ['created']
    

    model的序列化器方式一:

    class SnippetSerializer(serializers.Serializer):
        id = serializers.IntegerField(read_only=True)
        title = serializers.CharField(required=False, allow_blank=True, max_length=100)
        code = serializers.CharField(style={'base_template': 'textarea.html'})
        linenos = serializers.BooleanField(required=False)
        language = serializers.ChoiceField(choices=LANGUAGE_CHOICES, default='python')
        style = serializers.ChoiceField(choices=STYLE_CHOICES, default='friendly')
    
        def create(self, validated_data):
            """
            Create and return a new `Snippet` instance, given the validated data.
            """
            return Snippet.objects.create(**validated_data)
    
        def update(self, instance, validated_data):
            """
            Update and return an existing `Snippet` instance, given the validated data.
            """
            instance.title = validated_data.get('title', instance.title)
            instance.code = validated_data.get('code', instance.code)
            instance.linenos = validated_data.get('linenos', instance.linenos)
            instance.language = validated_data.get('language', instance.language)
            instance.style = validated_data.get('style', instance.style)
            instance.save()
            return instance

    model的序列化器方式二:

    from rest_framework import serializers
    from snippets.models import Snippet, LANGUAGE_CHOICES, STYLE_CHOICES
    
    
    class SnippetSerializer(serializers.ModelSerializer):
        class Meta:
            model = Snippet
            fields = ('id','title','code','linenos','language','style')

    使用在视图层使用序列化器方式一:

    from django.http import HttpResponse, JsonResponse
    from django.views.decorators.csrf import csrf_exempt
    from rest_framework.parsers import JSONParser
    from snippets.models import Snippet
    from snippets.serializers import SnippetSerializer
    
    
    @csrf_exempt
    def snippet_list(request):
        """
        List all code snippets, or create a new snippet.
        """
        if request.method == 'GET':
            snippets = Snippet.objects.all()
            serializer = SnippetSerializer(snippets, many=True)
            return JsonResponse(serializer.data, safe=False)
    
        elif request.method == 'POST':
            data = JSONParser().parse(request)
            serializer = SnippetSerializer(data=data)
            if serializer.is_valid():
                serializer.save()
                return JsonResponse(serializer.data, status=201)
            return JsonResponse(serializer.errors, status=400)
    
    @csrf_exempt
    def snippet_detail(request, pk):
        """
        Retrieve, update or delete a code snippet.
        """
        try:
            snippet = Snippet.objects.get(pk=pk)
        except Snippet.DoesNotExist:
            return HttpResponse(status=404)
    
        if request.method == 'GET':
            serializer = SnippetSerializer(snippet)
            return JsonResponse(serializer.data)
    
        elif request.method == 'PUT':
            data = JSONParser().parse(request)
            serializer = SnippetSerializer(snippet, data=data)
            if serializer.is_valid():
                serializer.save()
                return JsonResponse(serializer.data)
            return JsonResponse(serializer.errors, status=400)
    
        elif request.method == 'DELETE':
            snippet.delete()
            return HttpResponse(status=204)
    

     方式一路由:

    from django.urls import re_path
    from snippets import views
    
    urlpatterns = [
        path('snippets/', views.snippet_list),
        path('snippets/<int:pk>/', views.snippet_detail),
    ]
    
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  • 原文地址:https://www.cnblogs.com/snow-wolf-1/p/11815754.html
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