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All Projects → dizballanze → Django Eraserhead

dizballanze / Django Eraserhead

Licence: mit
💂🏻 Django package that provides hints to optimize database usage by deferring unused fields (and more)

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============================= Django Eraserhead

.. image:: https://badge.fury.io/py/django-eraserhead.svg :target: https://badge.fury.io/py/django-eraserhead

.. image:: https://travis-ci.org/dizballanze/django-eraserhead.svg?branch=master :target: https://travis-ci.org/dizballanze/django-eraserhead

.. image:: https://codecov.io/gh/dizballanze/django-eraserhead/branch/master/graph/badge.svg :target: https://codecov.io/gh/dizballanze/django-eraserhead

.. image:: https://img.shields.io/badge/Say%20Thanks-!-1EAEDB.svg :target: https://saythanks.io/to/dizballanze

Provide hints to optimize database usage by deferring unused fields

.. image:: https://github.com/dizballanze/django-eraserhead/raw/master/eraserhead.jpg

WARNING use this package only in dev environment!

Documentation

Requirements

  • Django 1.9+
  • Python 2.7, 3.4+

Quickstart

Install Django Eraserhead::

pip install django-eraserhead

Add it to your INSTALLED_APPS:

.. code-block:: python

INSTALLED_APPS = (
    ...
    'eraserhead.apps.EraserheadConfig',
    ...
)

ERASERHEAD_ENABLED = True
ERASERHEAD_TRACEBACK_BASE_PATH = BASE_DIR

Settings:

  • ERASERHEAD_ENABLED - enable/disable Django Eraserhead
  • ERASERHEAD_TRACEBACK_BASE_PATH - set base path to filter tracebacks. Set to None to display full traceback.

Features

.. image:: https://github.com/dizballanze/django-eraserhead/raw/master/screenshot.png

Django Eraserhead monitors:

  • querysets/models fields usage (used and unused fields) with considering deferred fields
  • count of instances created for each queryset
  • corresponding model of each queryset
  • traceback for each queryset to easily find corresponding code
  • calculate memory consumption of unused fields

Based on fields usage Django Eraserhead suggests optimizations for each queryset.

TODO

  • decorator and/or context processor for partial stats collecting
  • detect deferred fields loading
  • auto deferring fields based on usage
  • display deferred fields

Running Tests

::

source <YOURVIRTUALENV>/bin/activate
(myenv) $ pip install tox
(myenv) $ tox

Credits

Tools used in rendering this package:

  • Cookiecutter_
  • cookiecutter-djangopackage_

.. _Cookiecutter: https://github.com/audreyr/cookiecutter .. _cookiecutter-djangopackage: https://github.com/pydanny/cookiecutter-djangopackage

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