Hi,
I would like to extend account_invoice.Invoice.search_total_amount[A]
which is based on a python-sql query.
It should be extended with another module.
In my extension I would like to replace the following column[B]::
Coalesce(Sum(Round(
(
line.quantity * line.unit_price).cast(type_name),
currency.digits)), 0).as_('total_amount'),
with something like this::
Coalesce(Sum(Round(
(
line.quantity * line.unit_price * (1 - line.discount /
100.0) ).cast(type_name), currency.digits)), 0).as_('total_amount')
The general boilerplate code in the other module looks like::
class Invoice:
__metaclass__ = PoolMeta
__name__ = 'account.invoice'
@classmethod
def search_total_amount(cls, name, clause):
result = super(Invoice, cls).search_total_amount(
name, clause)
With introspection I found the column::
columns = list(
result[0][2].columns[0].table.select.im_self
.queries[0].columns)
But I have no idea, how to replace the column, because I have not the
correct line object from the depends module.
When I try something like this::
pool = Pool()
Line = pool.get('account.invoice.line')
line = Line.__table__()
columns[1] = Coalesce(Sum(Round((
line.quantity * line.unit_price * (1 - line.discount / 100.0)
).cast(type_name), currency.digits)), 0).as_('total_amount')
result[0][2].columns[0].table.select.im_self.queries[0].columns = \
tuple(columns)
the line table is wrong, I need the table from [B].
Questions:
1. Is it a good practice trying to extend python-sql?
2. Is there a better way to introspect the python-sql then this::
columns = list(
result[0][2].columns[0].table.select.im_self
.queries[0].columns)
3. How to get the line-object from the base sql?
TIA and Regards Udo Spallek
[A]http://hg.tryton.org/modules/account_invoice/file/tip/invoice.py#l741
[B]
http://hg.tryton.org/modules/account_invoice/file/tip/invoice.py#l764
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