Python: how to create initializer of a derived class

Question

I have a class order_order:

class order_order(osv.osv):

    _inherit = "sale.order"

    _columns = {
        'order_completed_date' : fields.char('Order Completed Date'),
        .
        .
        .
    }

Based on this SO post I wrote the following initializer:

def __init__(self, **kwargs):
    super(order_order, self).__init__(**kwargs)
    self.order_completed_date = order_completed_date
    .
    .
    .

I am trying to create an object as:

order_order.__new__(order_completed_date=order_completed_date, ...)

But I am getting the following error:

TypeError: __new__() got an unexpected keyword argument 'order_completed_date'

EDIT: Getting the same error with:

order_order(order_completed_date=order_completed_date, ...)

EDIT2: Full error:

Traceback (most recent call last):
  File "/home/nish/repos/stage/openerp/web/addons/web/http.py", line 292, in dispatch
    r = method(self, **self.params)
  File "/home/nish/repos/stage/openerp/web/addons/web/controllers/spree_api.py", line 118, in some_html
    order_order(order_completed_date=order_completed_date, order_id=order_id, product_id=product_id, product_name=product_name, size=size, product_cost_cp=product_cost_cp, product_cost_sp=product_cost_sp, product_cost_mrp=product_cost_mrp, product_creation_date=product_creation_date, product_taxon=product_taxon, user_email=user_email, user_name=user_name, user_address=user_address, user_city=user_city, city_zip_code=city_zip_code, user_state=user_state, user_country=user_country)
TypeError: __new__() got an unexpected keyword argument 'user_address'

What am I doing wrong? How can I correct the error?

poke · Accepted Answer · 2014-11-28 12:41:36Z

2

__new__ is the type’s constructor, and you usually don’t want to use it like that ever. The normal way to create an object, that also includes calling its initializator is this:

order_order(order_completed_date=order_completed_date, ...)

So, just call the type; and the parameters of that call will be passed to the initializator.

answered Nov 28, 2014 at 12:41

poke

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6 Comments

nish Over a year ago

Do I need to make changes in the initializer of base class?

poke Over a year ago

Can you show the full error message? The same error is unlikely (since you are no longer calling __new__ explicitely); but it’s possible that passing the keyword arguments to the base type. You should probably not pass the keyword arguments to the base’s __init__.

poke Over a year ago

Well, in the file spree_api.py, on line 119, you are still calling order_order.__new__(…) instead of just order_order(…).

nish Over a year ago

Sorry, I copied the old traceback. PLease can you have a look again. Even without new, I am getting the same error

nish Over a year ago

Also tried super(order_order, self).__init__(). But same

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