Django Restのポストオブジェクトのデータを更新するには？

Question

私はこのシリアライザ持っている：私が思うに、

class LikeSerializer(serializers.ModelSerializer): 
    user = serializers.PrimaryKeyRelatedField(queryset=ExtUser.objects.all(), required=False, allow_null=True, default=None) 
    class Meta: 
     model = Like 
     field = ('user', 'post') 


    def create(self, validated_data): 

     post = Post(id=validated_data['post'], author=validated_data['user']) 
     #post=Post.objects.get(pk=validated_data['post']) 
     post.rating += 1 
     print(post) 
     post.save() 
     return Like.objects.create(**validated_data) 

と私がint（）を追加しようとしたオブジェクトTypeError: int() argument must be a string or a number, not 'Post'

のように保存しようとしたとき、私は、エラーを取得しますが、それはありません助けI正しくない更新ポストオブジェクト

Traceback (most recent call last): 
    File "/Library/Python/2.7/site-packages/django/core/handlers/base.py", line 149, in get_response 
    response = self.process_exception_by_middleware(e, request) 
    File "/Library/Python/2.7/site-packages/django/core/handlers/base.py", line 147, in get_response 
    response = wrapped_callback(request, *callback_args, **callback_kwargs) 
    File "/Library/Python/2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view 
    return view_func(*args, **kwargs) 
    File "/Library/Python/2.7/site-packages/django/views/generic/base.py", line 68, in view 
    return self.dispatch(request, *args, **kwargs) 
    File "/Library/Python/2.7/site-packages/rest_framework/views.py", line 466, in dispatch 
    response = self.handle_exception(exc) 
    File "/Library/Python/2.7/site-packages/rest_framework/views.py", line 463, in dispatch 
    response = handler(request, *args, **kwargs) 
    File "/Library/Python/2.7/site-packages/rest_framework/decorators.py", line 53, in handler 
    return func(*args, **kwargs) 
    File "/Users/olegklimakov/Documents/6rp/likes/views.py", line 19, in send_like 
    serializer.save(user=request.user, isLiked=True) 
    File "/Library/Python/2.7/site-packages/rest_framework/serializers.py", line 191, in save 
    self.instance = self.create(validated_data) 
    File "/Users/olegklimakov/Documents/6rp/likes/serializers.py", line 39, in create 
    post.save() 
    File "/Library/Python/2.7/site-packages/django/db/models/base.py", line 700, in save 
    force_update=force_update, update_fields=update_fields) 
    File "/Library/Python/2.7/site-packages/django/db/models/base.py", line 728, in save_base 
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields) 
    File "/Library/Python/2.7/site-packages/django/db/models/base.py", line 793, in _save_table 
    forced_update) 
    File "/Library/Python/2.7/site-packages/django/db/models/base.py", line 823, in _do_update 
    filtered = base_qs.filter(pk=pk_val) 
    File "/Library/Python/2.7/site-packages/django/db/models/query.py", line 790, in filter 
    return self._filter_or_exclude(False, *args, **kwargs) 
    File "/Library/Python/2.7/site-packages/django/db/models/query.py", line 808, in _filter_or_exclude 
    clone.query.add_q(Q(*args, **kwargs)) 
    File "/Library/Python/2.7/site-packages/django/db/models/sql/query.py", line 1243, in add_q 
    clause, _ = self._add_q(q_object, self.used_aliases) 
    File "/Library/Python/2.7/site-packages/django/db/models/sql/query.py", line 1269, in _add_q 
    allow_joins=allow_joins, split_subq=split_subq, 
    File "/Library/Python/2.7/site-packages/django/db/models/sql/query.py", line 1203, in build_filter 
    condition = self.build_lookup(lookups, col, value) 
    File "/Library/Python/2.7/site-packages/django/db/models/sql/query.py", line 1099, in build_lookup 
    return final_lookup(lhs, rhs) 
    File "/Library/Python/2.7/site-packages/django/db/models/lookups.py", line 19, in __init__ 
    self.rhs = self.get_prep_lookup() 
    File "/Library/Python/2.7/site-packages/django/db/models/lookups.py", line 57, in get_prep_lookup 
    return self.lhs.output_field.get_prep_lookup(self.lookup_name, self.rhs) 
    File "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py", line 744, in get_prep_lookup 
    return self.get_prep_value(value) 
    File "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py", line 976, in get_prep_value 
    return int(value) 
TypeError: int() argument must be a string or a number, not 'Post' 

Postモデル：

class Post(models.Model): 
    id = models.AutoField(primary_key=True) 
    date_create = models.DateField(auto_now_add=True) 
    date_change = models.DateField(auto_now=True) 

    title = models.CharField(max_length=250) # Max Length of title = 250 
    description = models.CharField(max_length=1000) # Max Length = 1000 chars 
    rating = models.IntegerField(default=1) 
    author = models.ForeignKey('extuser.ExtUser', blank=True, null=True) 

    def __unicode__(self): 
     return u"%s" % self.id 

Answer 1

これは、文の中のように思える

"ポスト（ID = validated_data、作者= validated_data [ 'ユーザー'] [ 'ポスト']）"、

validated_data [ 'ポスト'] 投稿オブジェクトではなく、オブジェクト オブジェクトですが、Postモデル内の 'id'はintオブジェクトを想定しています。

おそらくエラーが表示されます。

Answer 2

@transactional 
def create(self, validated_data): 
    post = Post(id=validated_data['post'], author=validated_data['user']) 
    post.rating += 1 
    post.save() 
    return super(self, LikeSerializer).create(validated_data) 

そのModelSerializerも、その仕事を作成してみましょうてもいいが、以下のコードは、新しいポストのエンティティを作成し、あなたは間違いなく、また

データの一貫性を保つためにトランザクションを使用する点に注意してください。

post = Post(...) 
post.save() 

あなたは既存のポストエンティティを確実に取得する必要があります Post.objects.filter(...).first()