django 如何使用带有 m2m 数据的字典创建对象

Question

我的模特：

class Book(models.Model):
    title = models.CharField(max_length=254)
    subtitle = models.CharField(max_length=254, null=True, blank=True)
    subjects = models.ManyToManyField(Subject)

class Subject(models.Model):
    name = models.CharField(max_length=255)
    description = models.CharField(max_length=254, null=True, blank=True)

我有这样一本字典：

dictionary = {'title':'test', 'subtitle':'test subtitle', 'subjects':[1,6]}

如何使用字典中的字段数据以编程方式创建书籍模型。

def create_obj(class, dictionary):
    pass

Answer 1

您可以将 ID 列表分配给 M2M 字段。相关管理员会将此列表转换为有效的 Subject 个对象：

book = Book.objects.create(title=dictionary['title'],
                           subtitle=dictionary['subtitle'])
book.subjects = dictionary['subjects']

如果您想 "deserialize" 来自此类字典的模型，那么您可以这样做：

def create_obj(klass, dictionary):
    obj = klass()

    # set regular fields
    for field, value in dictionary.iteritems():
        if not isinstance(value, list):
            setattr(obj, field, value)

    obj.save()

    # set M2M fields
    for field, value in dictionary.iteritems():
        if isinstance(value, list):
            setattr(obj, field, value)

    return obj

book = create_obj(Book, dictionary)

Answer 2

book = Book()
book.title = dictionary['title']
book.subtitle = dictionary['subtitle']
book.subjects = dictionary['subjects']
book.save()

django 如何使用带有 m2m 数据的字典创建对象

django how to create an object with the dictionary with m2m data

python

django

dictionary