ManyToMany category字段--在django restframework中显示title而不是id
型号

class Category(models.Model):
    title = models.CharField(max_length=50)
    slug = models.SlugField(max_length=50,null=False, unique=True) 
    def __str__(self):
        return self.title

class BlogPostModel(models.Model):
    author = models.ForeignKey(User, on_delete=models.CASCADE,null=True,blank=True)
    category = models.ManyToManyField(Category, related_name='catitems')
    title = models.CharField(max_length=255)
    body = models.TextField()
    slug = models.SlugField(max_length=255,null=False, unique=True)
    background_image = models.ImageField(upload_to='post-images',blank=True)
    image1 = models.ImageField(upload_to='post-images',blank=True)
    image2 = models.ImageField(upload_to='post-images',blank=True)
    created_date = models.DateTimeField(auto_now_add=True)
    def __str__(self):
        return self.title

字符串
我想显示类别的标题而不是类别的id
串行化器

class PostSerializer(serializers.ModelSerializer):
    author = serializers.CharField(source='author.email', read_only=True)
    class Meta:
            model = BlogPostModel
            fields = ['author','category','title','body','slug','background_image','created_date']

型
这是我的代码的结果：

"category": [
            1,
            2,
            3
        ],

型
我想要这个：

"category": [
             Category title(1)،
             Category title(2)،
             Category title(3)
        ],

型