Review needed

[Kakar Nyori]

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

[Venkatraman S]

Why do you want to do this! It looks complicated and badly formed.

-V

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