django_utils

Django utility functions and libraries that I have written over time and regularly use. All the libraries/functions are inside the common directory.

Details about the libraries included to help you get started.

common.external

External libraries that I use in my django projects.

• common.external.showme – This is an external package that I use for profiling function times. The most useful decorator of this library is showme.time

common.logging

Use this package to add logging to your django rest framework ViewSets. Following are the steps required for using this package:

• Add common.logging.middleware.LoggingMiddleware to the django setting MIDDLEWARE_CLASSES.
• Configure the logging setting in django settings. You can refer django_utils.settings.LOGGING for this purpose
• Use the mixin common.logging.mixins.APILoggingMixin in your ViewSets

common.utils

Set of utility functions/libraries that can be imported into any python app.

• utils.admin_filters

  Filters that can be imported into any django admin to give additional support. Currently, the IsNullBlank filter is available, which adds an additional set of django admin filters with options as Has Value, None (for fields with null=True), Blank (fields with blank=True) & Null or Blank (fields with both null=True, blank=True). Inherit this filter to create custom filter as follows:

  from common.utils.admin_filters import IsNullBlankFilter
  class PostTitleFilter(IsNullBlankFilter):
      title = 'Post Title'
      parameter_name = 'title'
      show_blank_filter = True
      show_null_filter = False
  

• utils.date_ops

  Set of functions for retrieving/constructing date time objects and time ranges. Refer the function documentation for details. Usage as follows:

  from common.utils.date_ops import DateTimeOperations as DtOps
  print(DtOps.ist_datetime(2017, 4, 14))
  print(DtOps.ist_now())
  print(DtOps.get_range_calendar_year())
  

• utils.exception

  Use ExceptionLogger for detailed logging of exceptions inside your code. Usage as follows:

  from common.utils.exception import ExceptionLogger
  try:
      # do something
      raise Exception
  except:
      ExceptionLogger.print_exception()
  

• utils.file_ops

  Set of functions to delete files and create/remove/recreate directories. Usage is self-explanatory.

• utils.http

  Primarily used for creating django responses with downloadable file objects.

• utils.logged_requests

  Python’s requests library enhanced with extensive logging. This library contains two sets of functions as follows:

  • LoggedRequests – wrapper over the vanilla requests methods. Usage as follows:

    from common.utils.logged_requests import LoggedRequests
    LoggedRequests.get('http://icanhazip.com', log_title='Demo for LoggedRequests ')
    

  • PatchedRequests – monkey patches the vanilla requests functions with logging details. The effect of using this is entire project wide. Usage as follows:

    # inside __init__.py
    from common.utils.logged_requests import PatchedRequests
    PatchedRequests.patch_library()
    
    # For sending requests in any other file use the vanilla request library as is with additional parameters log_title & log_response_data
    import requests
    requests.get('http://icanhazip.com', log_title='Demo for LoggedRequests ') # Gives the same result as LoggedRequests.get
    

• utils.model_fields

  Custom fields used across django models:

  • DefaultTZDateTimeField – A wrapper over models.DateTimeField that converts db value of datetime fields to django setting’s timezone.
  • CurrencyField – A wraper over models.FloatField that saves and retrieves numbers as 2-decimal precision values for monetary calculations.

• utils.models

  Contains MetaDataModel which has the basic meta data fields that ideally every model object should have.

• utils.queryset

  Contains QuerysetHelpers, a set of functions to help create querysets dynamically.

• utils.s3

  Set of functions to access amazon s3 buckets & push/pull objects to/from the same.

• utils.validators

  Set of functions that I use across my projects for variable validations.

• utils.vars

  Set of variables that I use for my personal semantic understandings.

Feel free to use/modify/share the libraries & functions as per your discretion. Happy Coding.