Note: This post shows an old way to modify the request object. I discuss a new way in my Pyramid add_request_method post.
This article will explain how to add a breadcrumb subscriber to a Pyramid project using 4 simple steps.
While programming https://school.yohdah.com/ I needed the ability to easily create breadcrumb links from the current url. You may view the bread.py source code here. The following guide describes the process I took to add this functionality.
1. Download and include bread.py at the top of your Pyramid project's __init__.py file:
from yourproject.bread import Bread from pyramid.events import subscriber, NewRequest
2. At the bottom of the projects __init__.py file create the following subscriber function as follows:
def bread_subscriber( event ):
""" Build Bread object and add to request """
event.request.bread = Bread( event.request.url )
3. Now we can add our new subscriber to our Pyramid config inside main and above the routes:
config.add_subscriber(bread_subscriber, NewRequest)
4. You are done! Now you should have the ability to use the bread object from your template. Below I have provided a mako template snippet:
% for link in request.bread.links:
${ link | n } /
% endfor