Proteus: Setting Lines attribute to a Model

[locx]

Suppose I have an instance of a model, say, purchase.purchase. It is assigned to a variable (let’s call it model) so that

>>> model
proteus.Model.get('purchase.purchase')(-44)

Now I want to add purchase lines to it, and I have a list of lines such that

>>> model_lines
[proteus.Model.get('purchase.line')(-25),
proteus.Model.get('purchase.line')(-26),
proteus.Model.get('purchase.line')(-27)]

What’s the best way of setting the lines attribute of model as model_lines?

NOTE: I don’t want to use lines explicitly, such as in model.lines.append() or model.lines.new(), because the model could be anything (for example model could be of type party.party and model_lines could be of type party.addresses.

So, I would prefer something like: setattr( model, 'lines' , model_list)

But this raises AttributeError.

Any ideas?

EDIT: I believe that model_list needs to be of type ModelList, whereas mine is just a plain python list. So I guess my question boils down to: how do I make a ModelList out of my python list?

[ced (Cédric Krier)]

proteus is designed to mimic the other clients. So you can do mainly only what can be done from these clients.
So to add record to a One2Many field, you must add them one by one using .append() or .new().

[locx]

So can’t I make a ModelList of purchase lines and add them all together?
model.lines = model_list can work, can it not?

[ced (Cédric Krier)]

@locx

So can’t I make a ModelList of purchase lines and add them all together?

How does such behavior is possible in the clients?

[locx]

Certainly it is possible using the extend method.