cuz-toolkit 0.2.0

A collection of Django utilities: Admin mixins, testing helpers, and common patterns

Django Toolkit

A collection of Django utilities: Admin mixins, testing helpers, and common patterns.

Installation

# From GitHub
uv add git+https://github.com/froggen/django-toolkit.git

# Local development
uv add --editable ../django-toolkit

Modules

toolkit.admin - Admin Mixins

from django.contrib import admin
from toolkit.admin import OwnerMixin, ReadOnlyMixin
from unfold.admin import ModelAdmin

@admin.register(Project)
class ProjectAdmin(OwnerMixin, ModelAdmin):
    owner_field = "user"  # Users can only edit their own projects

toolkit.testing - Testing Utilities

from toolkit.testing import has_index_on_columns, get_table_constraints

# Verify database indexes exist
def test_status_index_exists():
    assert has_index_on_columns("invoice", ["status", "created_at"])

Available Admin Mixins

Permission Control

Mixin	Description
SuperuserOnlyMixin	Only superusers can access
ReadOnlyMixin	No add/change/delete, view only
CRUDMixin	Basic CRUD for active users
OwnerMixin	Users can only access their own data
ReadOnlyOwnerMixin	View-only for owned data

Special Patterns

Mixin	Description
ActionsOnlyMixin	Hide save buttons, use actions only
SingleObjectMixin	Redirect to edit/add page (for one-per-user models)

Inline Mixins

Mixin	Description
InlineCRUDMixin	CRUD for inline models
ReadOnlyInlineMixin	Read-only inline

UI Helpers

Mixin	Description
HideRelatedFieldButtonsMixin	Hide add/edit/delete buttons on FK fields

Testing Utilities

Function	Description
get_table_constraints(table_name)	Get all constraints and indexes for a table
has_index_on_columns(table_name, columns)	Check if an index exists on specified columns

Usage Examples

Owner-based Permission

@admin.register(Article)
class ArticleAdmin(OwnerMixin, ModelAdmin):
    owner_field = "author"
    list_display = ["title", "author", "created_at"]

Nested Owner Field

@admin.register(Comment)
class CommentAdmin(OwnerMixin, ModelAdmin):
    owner_field = "post__author"  # Comment -> Post -> Author

Read-only with Owner Filter

@admin.register(Order)
class OrderAdmin(ReadOnlyOwnerMixin, ModelAdmin):
    owner_field = "customer"

Single Object (e.g., User Profile)

@admin.register(UserProfile)
class UserProfileAdmin(SingleObjectMixin, OwnerMixin, ModelAdmin):
    owner_field = "user"

Actions Only (e.g., Approval Workflow)

@admin.register(WithdrawalRequest)
class WithdrawalRequestAdmin(ActionsOnlyMixin, ModelAdmin):
    readonly_fields = ["amount", "status", "created_at"]
    actions_submit_line = ["approve_action", "reject_action"]

Index Validation in Tests

import pytest
from toolkit.testing import has_index_on_columns

@pytest.mark.django_db
class TestDatabaseIndexes:
    def test_composite_index_exists(self):
        assert has_index_on_columns("booking", ["status", "start"])

    def test_single_column_index_exists(self):
        assert has_index_on_columns("payment", ["transaction_id"])

License

MIT