dynamically add new fields to a osv model depending on the number of records of another osv model in openerp?

Question

How to dynamically add new fields to a osv model depending on the number of records of another osv model in openerp? For example I have a model which is for planning purchases. I need to show total order qty that came in each shop.so i need to add new field each time a new record in sale.shop is created.

Omal Bastin · Accepted Answer

Use __init__ function of your class to dynamically add the sales shop to _columns .

class planning(osv.osv):
def __init__(self, pool, cr):
shop_ids = pool.get('sale.shop').search(cr,SUPERUSER_ID,[])
for shop in pool.get('sale.shop').browse(cr, SUPERUSER_ID,shop_ids):
self._columns['shop_qty_%s'%shop.id] = fields.float(
'%s Order Qty'%shop.name)
return super(planning,self).__init__(pool, cr)

Torsten Francke · Answer

This is impossible with the current osv model. And it is bad software design.

Better, add a new model: purchase_shop_quantity and make a one2many relation from your current model to the new one

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