How to copy and object from one model to another model

[Aamu Padi]

Each user has many albums, and each album has its many photos. And each user has one background image to hold its many images. Similarly, a user has one profile picture to hold its many images.

These are my models:

class UserProfile(models.Model):
    user = models.OneToOneField(User)
    permanent_address = models.TextField()
    temporary_address = models.TextField()
    profile_pic = models.ForeignKey(ProfilePicture)
    background_pic = models.ForeignKey(BackgroundImage)

class Album(models.Model):
    user = models.ForeignKey(User)
    name = models.CharField(max_length=200)
    pub_date = models.DateTimeField(default=datetime.now)


class Photo(models.Model):
    album = models.ForeignKey(Album, default=3)
    image = models.ImageField(upload_to=get_upload_file_name)
    caption = models.CharField(max_length=200)
    pub_date = models.DateTimeField(default=datetime.now)


class BackgroundImage(models.Model):
    user = models.ForeignKey(User)
    image = models.ImageField(upload_to=get_upload_file_name)
    caption = models.CharField(max_length=200)
    pub_date = models.DateTimeField(default=datetime.now)


class ProfilePicture(models.Model):
    user = models.ForeignKey(User)
    image = models.ImageField(upload_to=get_upload_file_name)
    caption = models.CharField(max_length=200)
    pub_date = models.DateTimeField(default=datetime.now)

I tried doing this,  to let the user copy one image from ProfilePicture to Background Image, but didn't work:

# Get the user

>>>m = User.objects.get(username='m')

# Get its set of Profile pictures

>>>m_pro_set = m.profilepicture_set.all()

>>>m_pro_set

[<ProfilePicture: pro_mik>]

# Get its set of Background images

>>>m_back_set = m.backgroundimage_set.all()

>>>m_back_set
[<BackgroundImage: bg_mik>]

# Get an image object from Profile picture of the user

>>>m_pro_1 = m.profilepicture_set.get(id=2)
>>>m_pro_1

<ProfilePicture: pro_mik>

# Get an image object from Background image of the user
>>>m_back_1 = m.backgroundimage_set.get(id=2)
>>>m_back_1
<BackgroundImage: bg_mik>

# So, I tried to copy one image from BackgroundImage of a user to ProfilePicture

>>>m_pro_set.objects.create(m_back_1)

    File "<console>", line 1, object has attribute 'objects'

AttributeError: 'QuerySet' object has no attribute 'objects'

So my question is, how to copy an objects from one model to another? Any advice will be much appreciated. Thank you!

[Rafael E. Ferrero]

if you see many similarities between two models will surely are the same thing. So BackgroundImage and ProfilePicture are the same thing and Photo its very similar to. I think you must to use inheritance of models [1] an use choices [2] for distinct types of pics

I would do the following:

class Pics(models.Model):

    PICS_TYPES = (

        ('PHOTOS', 'Photos'),

        ('BACKGROUNDS', 'Backgrounds'),

        ('PROFILES', 'Profiles')   

    )

    user = models.ForeignKey(User)
    image = models.ImageField(upload_to=get_upload_file_name)

    caption = models.CharField(max_length=200)
    pub_date = models.DateTimeField(default=datetime.now)

    type = models.CharField(max_length=50, choices=PICS_TYPES)

class Album(models.Model):
    user = models.ForeignKey(User)
    name = models.CharField(max_length=200)

    pub_date = models.DateTimeField(default=datetime.now)

class Photo(Pics):
    album = models.ForeignKey(Album, default=3)

[1] https://docs.djangoproject.com/en/1.5/topics/db/models/#model-inheritance

[2] https://docs.djangoproject.com/en/1.5/ref/models/fields/#django.db.models.Field.choices

2013/11/5 Aamu Padi <aamu...@gmail.com>

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[Aamu Padi]

And how do I copy these images from one model to another?

To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/CAJJc_8WQMja-zJ6VNoD%2BVWZu8TAb0Gb_yQX-NCEa2vApae_dGQ%40mail.gmail.com.