apps.is_installed(app_name) Application Registry in Django

apps.is_installed(app_name):-

  • Checks whether an application with the given name exists in the registry. 
  • app_name is the full name of the app, Ex: 'django.contrib.admin'.

Comments

Post a Comment

Popular posts from this blog

Messages Framework in Django

The Messages Framework is located at django.contrib.messages and it is included in the default INSTALLED_APPS list of settings.py file when we create new projects using python manage.py startproject.  The messages framework provides a simple way to add messages to users. settings file contains a middleware named django.contrib.messages.middleware. MessageMiddleware in the MIDDLEWARE settings. Messages are stored in a cookie by default, and they are displayed in the next request from the user.  The messages framework in your views by importing the messages module and adding new messages with simple shortcuts, as follows:                from django.contrib import messages                messages.error(request, 'Something Went Wrong Here....!') Create new messages using the add_message() method or any of the following shortcut methods: success(): Success messages to be displayed after an a...
Read more

Forms in Django(bound, unbound, clean, is_valid, errors)

Bound and Unbound Forms: Form Instance is either bound to a set of data, or unbound. If it is bound to a set of data, it is capable of validating that data and rendering the form as HTML with the data displayed in the HTML. If it is unbound , it cannot do validation, because there’s no data to validate, but it can still render the blank form as HTML. To create an unbound Form instance, instantiate the class:          sf  = SampleForm() To bind data to a form, pass the data as a dictionary as the first parameter to your Form class constructor:           data = {'fieldname1': 'ABC', 'fieldname2': 'True, 'fieldname3': '123'}           sf = SampleForm(data) In the above dictionary, the keys are the field names, which correspond to the attributes in your Form class and the values are the data you are trying to validate. These will usually be strings, but there is no requirement that they be strings...
Read more

Advantages to using URLField() over TextField()

URLField is actually CharField which supports Regex-based URL pattern checking and a online validator which was replaced by a RegEx based validator, where as use TextField if you are not consider length-limitation of URL. Use of CharField or TextField depends on whether you want max-length constraint on the field, and which element type is more suitable for editing like textarea or input.          Ex:           from django.core.validators import URLValidator          url_ field = models.TextField(validators=[URLValidator()])
Read more