允许在Python / Django中重复多对多条目的方法 [英] Way to allow for duplicate many-to-many entries in Python/Django
问题描述
我有以下Django模型:
class Icon(models.Model):
name = models。 CharField(max_length = 200,null = False,blank = False)
class Post(models.Model):
icons = models.ManyToManyField(Icon)
当我写下面的代码:
post = Post()
pre>
icons = []
icon_id = form.cleaned_data ['icon_1']
if(icon_id):
i = Icon.objects.get(id = icon_id)
icons.append(i)
icon_id = form.cleaned_data ['icon_2']
if(icon_id):
i = Icon.objects.get (id = icon_id)
icons.append(i)
post.icons = icons
post.save()
它大部分工作正常,创建一个Post对象和两个Icon对象。
然而,如果在两种情况下icon_id都是1,比如说,在数据库中只创建一个条目,而不是两个。
所以看起来它检查重复项并将其删除。
如何让这个工作让我允许重复? (我想要两个与一个帖子相关的SAME图标。)
谢谢!
解决方案自己定义模型,具有这种非唯一的多对多关系
class PostIcon
post = models.ForeignKey(Post)
icon = models.ForeignKey(Icon)
,而不是一个一个地添加它们
图标中的图标:
PostIcon post = post,icon = icon).save()
或将该模型传递为
通过
参数ManyToManyField
例如class Post(models.Model):
icons = models.ManyToManyField(Icon,through = PostIcon)
,或者你可以有一个与
PostIcon
相关联的计数,而不是具有多个行,如果服务于用例,例如你可能想要一个徽章显示10次class PostIcon(models.Model):
post = models。 ForeignKey(Post)
icon = models.ForeignKey(Icon)
count = models.IntegerField()
I have the following Django model:
class Icon(models.Model): name = models.CharField(max_length=200,null=False,blank=False) class Post(models.Model): icons = models.ManyToManyField(Icon)
When I write the following code:
post = Post() icons = [] icon_id = form.cleaned_data['icon_1'] if (icon_id): i = Icon.objects.get(id=icon_id) icons.append(i) icon_id = form.cleaned_data['icon_2'] if (icon_id): i = Icon.objects.get(id=icon_id) icons.append(i) post.icons = icons post.save()
It works fine for the most part, creating a Post object and the two Icon objects.
However, if the icon_id is, say, 1 in both cases, it only creates ONE entry in the database, not two.
So it seems like it checks for duplicates and removes them.
How do I make this work so I allow duplicates? (I want two of the SAME icon associated with a post.)
Thanks!
解决方案Define the model yourself, to have such non-unique many-to-many relations
class PostIcon(models.Model): post = models.ForeignKey(Post) icon = models.ForeignKey(Icon)
and than add them one by one
for icon in icons: PostIcon(post=post, icon=icon).save()
or pass that model as
through
argument ofManyToManyField
e.g.class Post(models.Model): icons = models.ManyToManyField(Icon, through=PostIcon)
or alternatively you can have a count associated with
PostIcon
instead of having multiple rows, if that serves the use-case e.g. you may want a badge to be displayed 10 timesclass PostIcon(models.Model): post = models.ForeignKey(Post) icon = models.ForeignKey(Icon) count = models.IntegerField()
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