django-clone 2.9.1

Create a clone of a django model instance.

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django-clone

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

Features

• 100% test coverage.
• Multi Database support i.e Create a duplicate on one or more databases.
• Restrict fields used for creating a duplicate instance.
• Detect unique fields and naively add a suffix (copy {count}) to each new instance.

Table of contents

• Installation

• Usage

  • Subclassing the CloneModel

  • Using the CloneMixin

  • Duplicating a model instance

    • Bulk cloning a model
    • Multi database support

  • CloneMixin attributes

    • Explicit
    • Implicit

  • Creating clones without subclassing CloneMixin.

  • Django Admin

    • Duplicating Models from the Django Admin view.

      • List View
      • Change View

    • CloneModelAdmin class attributes

• Compatibility

• Running locally

• Found a Bug?

• Contributors ✨

Installation

Run

pip install django-clone

Usage

CHANGE

from django.db import models

class MyModel(models.Model):
    title = models.CharField(max_length=200)

TO

from django.db import models
from model_clone import CloneModel

class MyModel(CloneModel):
    title = models.CharField(max_length=200)

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_m2m_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>]>

Bulk cloning a model

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_clones = test_obj.bulk_clone(1000)

In [7]: len(test_obj_clones)
Out[7]: 1000

In [8]: test_obj_clone = test_obj_clones[0]

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

In [10]: test_obj_clone.title
Out[10]: 'New copy 1'

In [11]: test_obj_clone.tags.all()
Out[11]: <QuerySet [<Tag: men>, <Tag: women>]>

Multi database support

In [6]: test_obj_clone = test_obj.make_clone(using='replica')  # Replicate test object to a different database.

In [7]: test_obj_clone.pk
Out[7]: 1

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

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

In [10]: test_obj_clone._state.db
Out[10]: 'replica'

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_m2o_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.

NOTE: :warning:

• 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 []>

NOTE: :warning:

• 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 kwargs.

Django Admin

Duplicating Models from the 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

NOTE: :warning:

• Ensure that model_clone is placed before django.contrib.admin

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

Compatibility

Python	Supported version
Python2.6	<=2.5.3
Python3.5+	All versions

Django	Supported version
1.11	<=2.7.2
2.x	All versions
3.x	All versions

Running locally

$ git clone [e-mail]:tj-django/django-clone.git
$ make default-user
$ make run

Spins up a django server running the demo app.

Visit http://127.0.0.1:8000

Found a Bug?

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

If you feel generous and want to show some extra appreciation:

Support me with a :star:

Contributors ✨

Thanks goes to these wonderful people:

Gerben Neven 🐛 ⚠️ 💻

Sebastian Kapunkt 💻 🐛 ⚠️

Andrés Portillo 🐛

WhiteSource Renovate 🚧

Yuekui 💻 🐛 ⚠️

Take Weiland ⚠️ 🐛 💻

Patrick 🐛 💻

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