Hello,
This may be long, but I really need your help. I have a class *Asset*,
which is the *base class* of another *classes *(like *Photo, Question,
Video etc.*) Basically its a *Multiple Table Inheritance*. I need this to
get all the post or all the *objects* of the user. And it does what I want.
But I saw that, many were against *Multiple Table Inheritance, *or if not
they discouraged MTI. So, I really need to know that, *how much will it
matter*? Or is there any other way to achieve it. To get all the objects of
a *User*? Please help me decide what to do. If I am not clear, please ask
me. I will really appreciate if anyone would guide me through this.
Thank you.
*This are my models:*
class Asset(models.Model):
user = models.ForeignKey(User, related_name = "user_objects")
likes = models.ManyToManyField(User, through="Like",
related_name="Liked_user")
comments = models.ManyToManyField(User, through="Comment",
related_name="Commented_user")
timestamp = models.DateTimeField(auto_now = True, auto_now_add= False)
updated = models.DateTimeField(auto_now = False, auto_now_add = True)
class Meta:
ordering = ['-timestamp']
def __unicode__(self):
return self.__class__.__name__
class Like(models.Model):
asset = models.ForeignKey(Asset)
liked_by = models.ForeignKey(User)
liked_time = models.DateTimeField(auto_now = True, auto_now_add = False)
def __unicode__(self):
return "%s likes %s" % (self.liked_by, self.asset)
class Comment(models.Model):
asset = models.ForeignKey(Asset)
comment_by = models.ForeignKey(User)
liked_time = models.DateTimeField(auto_now = True, auto_now_add = False)
def __unicode__(self):
return "%s likes %s" % (self.comment_by, self.asset)
def get_upload_file_name(instance, filename):
return "uploaded_files/%s_%s" %(str(time()).replace('.','_'), filename)
class Album(Asset):
title = models.CharField(max_length=200)
description = models.TextField()
def __unicode__(self):
return self.__class__.__name__
class Picture(Asset):
description = models.TextField()
image = models.ImageField(upload_to=get_upload_file_name)
album = models.ForeignKey(Album, null=True, blank=True, default = None)
def __unicode__(self):
return self.__class__.__name__
class BackgroundImage(Picture):
pass
class ProfilePicture(Picture):
pass
class Tag(models.Model):
title = models.CharField(max_length=40)
description = models.TextField()
def __unicode__(self):
return self.title
class Question(Asset):
title = models.CharField(max_length=200)
description = models.TextField()
tags = models.ManyToManyField(Tag)
def __unicode__(self):
return self.title
class Answer(Asset):
description = models.TextField()
question = models.ForeignKey(Question)
def __unicode__(self):
return self.description
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