django restframework 序列化
2018-01-02 19:56
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Serialization 序列化
创建表
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',)
进行序列化的类(第一种)
from rest_framework import serializers from snippets.models import Snippet, LANGUAGE_CHOICES, STYLE_CHOICES 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') """上面的相当于form表单验证 缺点: 如果表的列比较多呢""" 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
序列化类常用的方法和属性
snippet = Snippet(code='foo = "bar"\n') serializer = SnippetSerializer(snippet) serializer.data # .data存储model的数据 # {'id': 2, 'title': u'', 'code': u'print "hello, world"\n', 'linenos': False, 'language': u'python', 'style': u'friendly'} #序列化转成json数据# content = JSONRenderer().render(serializer.data) content # '{"id": 2, "title": "", "code": "print \\"hello, world\\"\\n", "linenos": false, "language": "python", "style": "friendly"}' #反序列化# from django.utils.six import BytesIO stream = BytesIO(content) data = JSONParser().parse(stream) serializer = SnippetSerializer(data=data) serializer.is_valid() # True serializer.validated_data # OrderedDict([('title', ''), ('code', 'print "hello, world"\n'), ('linenos', False), ('language', 'python'), ('style', 'friendly')]) serializer.save() # <Snippet: Snippet object> serializer = SnippetSerializer(Snippet.objects.all(), many=True) serializer.data # [OrderedDict([('id', 1), ('title', u''), ('code', u'foo = "bar"\n'), ('linenos', False), ('language', 'python'), ('style', ...
序列化的类(第二种)简单明了
class SnippetSerializer(serializers.ModelSerializer): class Meta: model = Snippet 表名 fields = ('id', 'title', 'code', 'linenos', 'language', 'style') 列
view文件
get(获取): snippets = Snippet.objects.all() #从model取出所有数据 serializer = SnippetSerializer(snippets, many=True) # 进行序列化 return JsonResponse(serializer.data, safe=False) # 返回客户端 post(创建新的数据): data = JSONParser().parse(request) # 反序列化客户端数据 serializer = SnippetSerializer(data=data) # 实例化 if serializer.is_valid(): # 检查数据是否有问题 serializer.save() # 创建数据 return JsonResponse(serializer.data, status=201) # 返回给客户端刚刚创建的数据 return JsonResponse(serializer.errors, status=400) put(更新数据): 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) delete(删除数据): snippet.delete() return HttpResponse(status=204)
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