这是我要扩展现有的 mrp.bom 的新创建的 mrp_extend.py 文件：
class mrp_extend(osv.Model):
_inherit = 'mrp.bom'
def _get_unit_cost(self, cr, uid, ids, field_name, arg, context):
result = {}
for bom_line_obj in self.browse(cr, uid, ids, context=context):
result[bom_line_obj.id] = bom_line_obj.product_id.product_tmpl_id.standard_price or 0.00
return result
def _get_product_total_cost(self, cr, uid, ids, field_name, arg, context):
result = {}
for bom_line_obj in self.browse(cr, uid, ids, context=context):
result[bom_line_obj.id] = (bom_line_obj.product_id.product_tmpl_id.standard_price or 0.00) * (bom_line_obj.product_qty or 0.00)
return result
def get_total_cost(self, cr, uid, ids, name, args, context=None):
res = {}
for rec in self.browse(cr, uid, ids, context=context):
total_cost = 0.0
for line_rec in rec.bom_lines:
total_cost += line_rec.product_total_cost or 0.0
res.update({rec.id : total_cost})
return res
_columns = {
'product_unit_cost' : fields.function(_get_unit_cost, string="Product Unit Cost", digits_compute=dp.get_precision('Product Price')),
'product_total_cost' : fields.function(_get_product_total_cost, string="Product Unit Cost", digits_compute=dp.get_precision('Product Price')),
'total_cost' : fields.function(get_total_cost, string="Total Cost"),
'mrp_bom_ids' : fields.one2many('mrp.extend.bom', 'mrp_extend_id', 'Stock Extend Log', states={'done': [('readonly', False)]})
}
我创建了新的 mrp_extend.xml：
<?xml version="1.0" encoding="utf-8"?>
<openerp>
<data>
<!-- Add new field in MRP (By Henry on 07/Nov/2013) -->
<record id="stock_ext_form" model="ir.ui.view">
<field name="name">mrp.ext.form</field>
<field name="model">mrp.bom</field>
<field name="type">tree</field>
<field name="inherit_id" ref="mrp.mrp_bom_form_view" />
<field name="arch" type="xml">
<field name="bom_lines" position="after">
<field name="product_unit_cost"/>
<field name="product_total_cost" sum="Total Product Unit Cost"/>
</field>
</field>
</record>
</data>
</openerp>
我现在的问题是，如何在 mrp.bom 中存在的 bom_lines 树字段中显示我新创建的字段？
请帮忙。