django-clone 2.0.0

Create a clone of a django model instance.

django-clone

Create copies of a model instance with explicit control on how the instance should be duplicated (limiting fields or related objects) copied and unique field detection.

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Table of contents

• Installation

• Usage

  • Duplicating a Model Instance
  • Using the CloneMixin
  • Creating clones without subclassing CloneMixin
  • Duplicating Models from Django Admin view

• CHANGELOG

Installation

Run

pip install django-clone

Usage

Subclassing the CloneModel

from django.db import models
from django.utils.translation import gettext_lazy as _
from model_clone import CloneModel

class TestModel(CloneModel):
    title = models.CharField(max_length=200)
    tags =  models.ManyToManyField('Tags')

    _clone_many_to_many_fields = ['tags']


class Tags(models.Model):  #  To enable cloning tags directly use `CloneModel` as shown above.
    name = models.CharField(max_length=255)

    def __str__(self):
        return _(self.name)

Using the CloneMixin

from django.db import models
from django.utils.translation import gettext_lazy as _
from model_clone import CloneMixin

class TestModel(CloneMixin, models.Model):
    title = models.CharField(max_length=200)
    tags =  models.ManyToManyField('Tags')

    _clone_m2m_fields = ['tags']


class Tags(models.Model):  #  To enable cloning tags directly use `CloneMixin` as shown above.
    name = models.CharField(max_length=255)

    def __str__(self):
        return _(self.name)

Duplicating a model instance

In [1]: test_obj = TestModel.objects.create(title='New')

In [2]: test_obj.pk
Out[2]: 1

In [3]: test_obj.title
Out[3]: 'New'

In [4]: test_obj.tags.create(name='men')

In [4]: test_obj.tags.create(name='women')

In [5]: test_obj.tags.all()
Out[5]: <QuerySet [<Tag: men>, <Tag: women>]>

In [6]: test_obj_clone = test_obj.make_clone()

In [7]: test_obj_clone.pk
Out[7]: 2

In [8]: test_obj_clone.title
Out[8]: 'New copy 1'

In [9]: test_obj_clone.tags.all()
Out[9]: <QuerySet [<Tag: men>, <Tag: women>]>

CloneMixin attributes

Explicit

Field Names	Description
_clone_fields	Restrict the list of fields to copy from the instance (By default: Copies all fields excluding auto-created/non editable model fields)
_clone_m2m_fields	Restricted Many to many fields (i.e Test.tags)
_clone_m2m_or_o2m_fields	Restricted Many to One/One to Many fields
_clone_o2o_fields	Restricted One to One fields

Implicit

Field Names (include all except these fields.)	Description
_clone_excluded_fields	Excluded model fields.
_clone_excluded_m2m_fields	Excluded many to many fields.
_clone_excluded_m2o_or_o2m_fields	Excluded Many to One/One to Many fields.
_clone_excluded_o2o_fields	Excluded one to one fields.

:warning: NOTE: Ensure to either set _clone_excluded_* or _clone_*. Using both would raise errors.

Creating clones without subclassing CloneMixin.

In [1]: from model_clone.utils import create_copy_of_instance

In [2]: test_obj = TestModel.objects.create(title='New')

In [3]: test_obj.pk
Out[3]: 1

In [4]: test_obj.title
Out[4]: 'New'

In [5]: test_obj.tags.create(name='men')

In [6]: test_obj.tags.create(name='women')

In [7]: test_obj.tags.all()
Out[7]: <QuerySet [<Tag: men>, <Tag: women>]>

In [8]: test_obj_clone = create_copy_of_instance(test_obj, attrs={'title': 'Updated title'})

In [9]: test_obj_clone.pk
Out[9]: 2

In [10]: test_obj_clone.title
Out[10]: 'Updated title'

In [11]: test_obj_clone.tags.all()
Out[11]: <QuerySet []>

:warning: NOTE:

• This method won't copy over related objects like Many to Many/One to Many relationships.
• Ensure that required fields skipped from being cloned are passed in using the attrs dictionary.

Duplicating Models from Django Admin view.

Change

from django.contrib import admin
from django.contrib.admin import ModelAdmin

@admin.register(TestModel)
class TestModelAdmin(ModelAdmin):
    pass

to

from model_clone import CloneModelAdmin

@admin.register(TestModel)
class TestModelAdmin(CloneModelAdmin):
    pass

List View

Change View

CloneModelAdmin class attributes

from model_clone import CloneModelAdmin

@admin.register(TestModel)
class TestModelAdmin(CloneModelAdmin):
    # Enables/Disables the Duplicate action in the List view (Defaults to True)
    include_duplicate_action = True
    # Enables/Disables the Duplicate action in the Change view (Defaults to True)
    include_duplicate_object_link = True

:warning: NOTE: Ensure that model_clone is placed before django.contrib.admin

INSTALLED_APPS = [
    'model_clone',
    'django.contrib.admin',
    '...',
]

Found a Bug?

To file a bug or submit a patch, please head over to django-clone on github.

Contributors ✨

Thanks goes to these wonderful people:

Gerben Neven 🐛 ⚠️ 💻

Sebastian Kapunkt 💻 🐛 ⚠️

Andrés Portillo 🐛

WhiteSource Renovate 🚧

Yuekui 💻 🐛 ⚠️

This project follows the all-contributors specification. Contributions of any kind welcome!