DRF PUT请求

Question

我有以下型号：

class Movie(models.Model): 
    name = models.CharField(max_length=800, unique=True) 
    imdb_rating = models.IntegerField(null=True) 
    movie_choice = (
     ('Act', 'Action'), 
     ........... 
    ) 
    movie_type = models.CharField(max_length=3, choices=movie_choice) 
    created_at = models.DateTimeField(auto_now_add=True) 
    updated_at = models.DateTimeField(auto_now=True) 


class Hiren(models.Model): 
    movie = models.ForeignKey(Movie) 
    watched_full = models.BooleanField(default=True) 
    rating = models.IntegerField() 
    source = models.CharField(max_length=500, null=True) 
    watched_at = models.DateField() 
    quality_choice = (
    .................. 
    ) 
    video_quality = models.CharField(max_length=3, choices=quality_choice) 
    created_at = models.DateField(auto_now_add=True) 
    updated_at = models.DateField(auto_now=True) 

和串行：

class MovieSerializer(serializers.ModelSerializer): 
    class Meta: 
     model = Movie 
     fields = '__all__' 


class HirenSerializer(serializers.ModelSerializer): 
    movie = MovieSerializer() 

    class Meta: 
     model = Hiren 
     fields = ('movie', 'id', 'watched_full', 'rating', 'source', 'video_quality', 'watched_at') 

    def update(self, instance, validated_data): 
     instance.movie.name = validated_data.get('movie', {}).get('name') 
     instance.movie.imdb_rating = validated_data.get('movie', {}).get('imdb_rating') 
     instance.movie.movie_type = validated_data.get('movie', {}).get('movie_type') 
     instance.watched_full = validated_data.get('watched_full', instance.watched_full) 
     instance.rating = validated_data.get('rating', instance.rating) 
     instance.source = validated_data.get('source', instance.source) 
     instance.video_quality = validated_data.get('video_quality', instance.video_quality) 
     instance.watched_at = validated_data.get('watched_at', instance.watched_at) 
     instance.movie.save() 
     instance.save() 

     return instance 

当我试图发送一个PUT请求，而不从电影模式转变name领域，它抛出一个错误

{ 
    "movie": { 
     "name": [ 
      "movie with this name already exists." 
     ] 
    } 
} 

但是，我可以完美更新任何其他领域，如果我改变name每次的字段值。

Answer 1

问题出在您定义的电影模型中。 当您将电影模型的名称字段设置为unique = True时，任何具有相同电影名称的新条目将始终引发错误。

在模型中，

class Movie(models.Model): 
    name = models.CharField(max_length=800, unique=True) 
    imdb_rating = models.IntegerField(null=True) 
    movie_choice = (
     ('Act', 'Action'), 
     ........... 
    ) 
    movie_type = models.CharField(max_length=3, choices=movie_choice) 
    created_at = models.DateTimeField(auto_now_add=True) 
    updated_at = models.DateTimeField(auto_now=True) 

如果你想添加两个条目具有相同的名称，删除行唯一= True或请务必保存具有不同名称的每个条目。

或者，如果您想更新记录/条目，则不需要为名称字段分配值，只需从代码中删除该行，或者检查电影的名称是否与这样的代码的改进：

class HirenSerializer(serializers.ModelSerializer): 
    movie = MovieSerializer() 

    class Meta: 
     model = Hiren 
     fields = ('movie', 'id', 'watched_full', 'rating', 'source', 'video_quality', 'watched_at') 

    def update(self, instance, validated_data): 
     movie_name = validated_data.get('movie', {}).get('name') 

     if movie_name != instance.movie.name : 
      instance.movie.name = movie_name 

     instance.movie.imdb_rating = validated_data.get('movie', {}).get('imdb_rating') 
     instance.movie.movie_type = validated_data.get('movie', {}).get('movie_type') 
     instance.watched_full = validated_data.get('watched_full', instance.watched_full) 
     instance.rating = validated_data.get('rating', instance.rating) 
     instance.source = validated_data.get('source', instance.source) 
     instance.video_quality = validated_data.get('video_quality', instance.video_quality) 
     instance.watched_at = validated_data.get('watched_at', instance.watched_at) 
     instance.save() 

     return instance 

希望这可以帮助，谢谢。