I have a possibly very lame question.
I am fairly new to RoR, and I want to make sure I do it “right”.
I have a model called Invoice, and one called InvoiceLines. Usual story:
the table “invoice” has a 1:n relationship with “invoice_lines”, which
Now… the application will have a “new order” button, which will allow
the user to enter all of the order details, etc. Then, the user will
want to add invoice_lines, which are obviously associated with the
The easiest solution I can think of is to have a session variable
(session[:invoice_id]?) so that the application “remembers” which
invoice you are dealing with (and in fact can also show the heading for
I can see problems here though, in case for example I want to allow the
user to add order_lines from the same page as the invoice_view using
Ajax. The scenario is clear: the user opens an order. Then he opens
another order and adds some order_lines there. Then… well, he goes
back to the first window, and - surprise surprise - he will be adding
line_items to the wrong invoice!
The super-easy solution then is to simply have the invoice_id as a
parameter of the action that deals with adding line_items. That way Ajax
is happy, I am happy… but would this really be the right way to do
Well, apologies if this question is lame. I just want to make sure…