CODEWITHSUNDEEP
pythondjangomodel
paynestrike
paynestrike

Reputation: 4658

How can a django model field relate to multiple model?

suppose I have three model like this:

 class video(models.Model):
       name=models.CharField(max_length = 100)

 class image(models.Model):
       name=models.CharField(max_length = 100)

 class comments(models.Model):
       content=models.CharField(max_length = 100)

now i want to notic the user if their video or image get an comment

this is what i want

the message model:

class message(models.Model):
       type=models.CharField(max_length = 100) # 'video' or 'image'
       video_or_image=models.ForeignKey(video or image)

       #the type is just a string to tell if the comment is about the video or image
       #video_or_image need to be video foreignkey or image foreignkey depends on type

is it possible.

I currently work around this by two method

first：

   class message(models.Model):
       type = models.CharField(max_length = 100) # 'video' or 'image'
       video_or_image_id = models.IntegerField(default = 1)
       #

second

  class message(models.Model):
       type=models.CharField(max_length = 100) # 'video' or 'image'
       video=models.ForeignKey(video)
       image=models.ForeignKey(image)
       # if the comment is about video just leave the image empty

if the one field to multiple model can not be done, then which my work around method is better, or help me with a better one!

Upvotes: 2

Views: 910

Answers (1)

arie
arie

Reputation: 18982

You are looking for a GenericForeignKey.

This is also the way contrib.comments relates comments to commented items.

Upvotes: 6

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