Hello everyone.
I am working with a controller for ratings on an item. The item
details come from a legacy database, and the ratings are stored in a
separate database. In the ratings database, alongside the ordinal
ratings I store the identifier of the item it refers to. I am using
the CRUD module to automagically generate the form I require. However,
I would like one particular field, the 'item_id' field, to be pre-
filled, invisible to and non-editable by the user. The item_id is the
first and only parameter to the ratings controller.
My current approach is to set the Field properties readable and
writable to False, and then modifying db.ratings.item_id.default with
each invocation to the controller. Is this a safe practice, or is it
possible that in a use case with two concurrent users, one user may
see the changes caused by the other user?
My next question is, is there a better way to do this? It almost feels
like there should be a hidden widget of some sort, but how would I
pass it the required value, since it varies according to the
parameters given to the controller? I am very new to this, so I may
have made some simple beginner mistakes and am very open to any design
suggestions.
I include a sketch of my controller below for reference.
Thanks in advance.
Cheers
Marco
@auth.requires_login()
def rate():
item_id = request.args(0)
target = db.item[item_id]
# target not valid, redirect to summary
if not target: redirect(URL(r=request, f='summary'))
ratings = db.ratings
ratings.item_id.default = target_id
prev = db((ratings.annotator_id==auth.user.id) &
(ratings.item_id==item_id)).select()
if len(prev) == 0:
form = crud.create(ratings, next=URL(r=request,f='summary'))
else:
form = crud.update(uq, prev[0], next=URL(r=request,f='summary'),
deletable=False)
return dict(form=form, target=target)
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