How to populate default rows in one2many's treeview?

Question

Hi,
I want to alter the functionality of sale order form, what I want to do is whenever a new sale order is to be create the one2many order_lines treeview should contains some default field rows as shown in linked figure, which are then inserted into the relation model on save.
https://drive.google.com/file/d/0BwpBdLTvPsQtWkJPdUN0YjVPZjQ/view?usp=sharing

HammadHQ (Odoo Pakistan) · Accepted Answer

I came across to handle this by inheriting default_get method of the sale order that contains the one2many order_lines field in which I return the values to this field
def default_get(self, cr, uid, fields_list, context=None):
res = super(sale_order, self).default_get(cr, uid, fields_list, context)
res['order_lines'] = (0, 0, { 'here_the_field_name_of_order_lines_comodel': 'values_goes_here' })
return res

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