Since IronPython doesn't support attributes I am wondering if there is another way to decorate IronPython classes with attributes, perhaps with reflection?
Clients have many Invoices. Invoices have a number attribute that I want to initialize by incrementing the client's previous invoice number.
For example:
@client = Client.find(1)
@client.last_invoice_number
> 14
@invoice = @client.invoices.build
@invoice.number
> 15
I want to get this functionality into my Invoice model, but I'm not sure how to. Here's what I'm imagining the code to be like:
class Invoice < ActiveRecord::Base
...
def initialize(attributes = {})
client = Client.find(attributes[:client_id])
attributes[:number] = client.last_invoice_number + 1
client.update_attributes(:last_invoice_number => client.last_invoice_number + 1)
end
end
However, attributes[:client_id] isn't set when I call @client.invoices.build.
How and when is the invoice's client_id initialized, and when can I use it to initialize the invoice's number? Can I get this logic into the model, or will I have to put it in the controller?
Let's say I run an ActiveRecord query and it returns 3 results, with a bunch of attributes.
I want to add 3 attributes to each record in the Array so I can do sorting at a code-level. These 3 include: num_comments, num_views, last_view.
How do I add these attributes?
How do I then sort the records, in order of precendence, by num_comments AND by num_views AND by last_view?
I'm looking for a list of reasonable use cases of putting attributes in a parameter.
I can think of some good cases for attributes in a method, but can't seem to see a good usage of a parameter attribute. Please, enlighten me.
And what about attributes on the return type of a method?
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