Django：如何将数据保存到ManyToManyField？ [英] Django: How to save data to ManyToManyField?

问题描述

我对以下模型有疑问。我想从views.py填充 ManyToManyField 而不是从管理员中填充。

I have a question concerning the following model. I want to populate the ManyToManyField from views.py instead of doing it from the Admin.

但是我该怎么办将数据添加到流派字段，该字段是 ManyToManyField ？

But how do I add data to the genres field which is the ManyToManyField?

views.py

content = Movie_Info(id = m_id,
                    title = data[0].get('title'),
                    overview = data[0].get('overview'),
                    release_date = data[0].get('release_date'),
                )
content.save()

models.py

class Movie_Info_genre(models.Model):
    genre = models.CharField(max_length=100)

class Movie_Info(models.Model):
    id             = models.IntegerField(primary_key=True)
    title          = models.CharField(max_length=100, blank=True, null=True)
    overview       = models.TextField(blank=True, null=True)
    release_date   = models.CharField(max_length=10, blank=True, null=True)
    genres         = models.ManyToManyField(Movie_Info_genre)

推荐答案

使用相关字段的添加方法：

# using Model.object.create is a shortcut to instantiating, then calling save()
myMoveInfo = Movie_Info.objects.create(title='foo', overview='bar')
myMovieGenre = Movie_Info_genre.objects.create(genre='horror')
myMovieInfo.genres.add(myMoveGenre)

与修改其他字段，在执行此操作之前，两个模型都必须存在于数据库中，因此您必须在添加多对多关系之前调用保存。由于添加会立即影响数据库，因此您以后无需保存。

Unlike modifying other fields, both models must exist in the database prior to doing this, so you must call save before adding the many-to-many relationship. Since add immediately affects the database, you do not need to save afterwards.

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