Ruby on Rails

I have Shop has_many :documents and Documen belongs_to :shop.
When I create a new shop I use accept_nested_attributes_for :documents
in the model and fields_for in the form, so I can create a new shop
and at the same time a document associated to the shop.
I want to add a new document associated to the shop also when I edit
the shop, at the same time I edit the shop.
If I call the edit action for shop, in the form I have the fields for
one of the documents associated with their values but I want to add a
new document.
There is a way to do this?

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