Entity Reference - am I using it correctly? I need a bit of help with entity references. I have Customer Profiles entity and Credit Card entity. I'd like to be able to create "credit cards" and attach them to customer profiles so that if I click hte customer profile, I'd see any credit cards attached to them. I'm not sure how to do this. I've created the credit card content type, added a reference field to it that references the customer, but I'm not sure how to display the filtered credit card entries on the customer profile. I've tried adding an entity reference field to the customer profile back to the credit cards but don't know how to filter the results.

My brain hurts a bit at this point.
One way to do it is with Views and a module called Eva (Entity Views Attachment).  Eva allows a view to be attached to a host entity, and understands how to filter the view based using the host entity's id to display only related information.

Since you already have the entity reference field on the credit cart type, the steps would look like this:


Install Eva and Views as needed
Create a View for the credit card content type
In the view, add an "EVA" display
Configure the view to be attached to the customer (under Entity content settings)
Add a Contextual filter using the field that links back to Customer. This will filter credit cards using the customer profile entity