Django simplest read-only widget

widgets.py

# Based on the below answer on the SO question:
# In a Django form, how do I make a field readonly (or disabled) so that it cannot be edited?
# https://stackoverflow.com/a/15134622/4126114
#
# Usage of either widget classes below:
# class MyForm(forms.ModelForm):
#  class Meta:
#    widgets = {
#      'field': ReadOnlyWidgetSimple(),
#      'foreign_key': ReadOnlyWidgetMyModel()
#    }

from django.forms import widgets

# For non-foreign-key fields, display them in <p>...</p>
# Note the "str(...)" necessary for things like datetime objects
# Also, without the <p>...</p>, the field in bootstrap_form does not show up aligned properly
class ReadOnlyWidgetSimple(widgets.Widget):
  """Some of these values are read only - just a bit of text..."""
  def render(self, _, value, attrs=None):
    return "<p>"+str(value)+"</p>"

# For foreign-key fields, display their __str()__ result
# Usage: Define a class inheriting from this, and which defines the "model" attribute
# e.g.
# class ReadOnlyWidgetMyModel(ReadOnlyWidgetModel):
#   model = MyModel  # <<<<< put your model class here
class ReadOnlyWidgetModel(widgets.Widget):
  model = None
  """Some of these values are read only - just a bit of text..."""
  def render(self, _, value, attrs=None):
    if not self.model: raise Exception("Define model")
    v2 = self.model.objects.get(id=value)
    v2 = "<p>"+str(v2)+"</p>"
    return v2

Over a year, so I am betting you have found a workaround or simply just moved on.

But I believe the problem with your code lies in the way you have tried to override the render function.
The render() method takes in 5 parameters, causing some backward compatibility issues with older versions of Django.

def render(self, name, value, attrs=None, renderer=None):

Better later than never 😄
@nameisnot sorry I hadn't seen your comment earlier. @lanningspencer is probably right about this.