/usr/lib/python2.7/dist-packages/trytond/model/fields/many2one.py is in tryton-server 3.4.0-3+deb8u3.
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#this repository contains the full copyright notices and license terms.
from types import NoneType
from sql import Query, Expression
from sql.operators import Or
from .field import Field, SQLType
from ...pool import Pool
from ... import backend
from ...tools import reduce_ids
from ...transaction import Transaction
class Many2One(Field):
'''
Define many2one field (``int``).
'''
_type = 'many2one'
def __init__(self, model_name, string='', left=None, right=None,
ondelete='SET NULL', datetime_field=None, help='', required=False,
readonly=False, domain=None, states=None, select=False,
on_change=None, on_change_with=None, depends=None,
context=None, loading='eager'):
'''
:param model_name: The name of the target model.
:param left: The name of the field to store the left value for
Modified Preorder Tree Traversal.
See http://en.wikipedia.org/wiki/Tree_traversal
:param right: The name of the field to store the right value. See left
:param ondelete: Define the behavior of the record when the target
record is deleted. (``CASCADE``, ``RESTRICT``, ``SET NULL``)
``SET NULL`` will be changed into ``RESTRICT`` if required is set.
:param datetime_field: The name of the field that contains the datetime
value to read the target record.
'''
self.__required = required
if ondelete not in ('CASCADE', 'RESTRICT', 'SET NULL'):
raise Exception('Bad arguments')
self.ondelete = ondelete
if datetime_field:
if depends:
depends.append(datetime_field)
else:
depends = [datetime_field]
super(Many2One, self).__init__(string=string, help=help,
required=required, readonly=readonly, domain=domain, states=states,
select=select, on_change=on_change, on_change_with=on_change_with,
depends=depends, context=context, loading=loading)
self.model_name = model_name
self.left = left
self.right = right
self.datetime_field = datetime_field
__init__.__doc__ += Field.__init__.__doc__
def __get_required(self):
return self.__required
def __set_required(self, value):
self.__required = value
if value and self.ondelete == 'SET NULL':
self.ondelete = 'RESTRICT'
required = property(__get_required, __set_required)
def get_target(self):
'Return the target Model'
return Pool().get(self.model_name)
def __set__(self, inst, value):
Target = self.get_target()
if isinstance(value, dict):
value = Target(**value)
elif isinstance(value, (int, long)):
value = Target(value)
assert isinstance(value, (Target, NoneType))
super(Many2One, self).__set__(inst, value)
@staticmethod
def sql_format(value):
if isinstance(value, (Query, Expression)):
return value
if value is None:
return None
assert value is not False
return int(value)
def sql_type(self):
db_type = backend.name()
if db_type == 'postgresql':
return SQLType('INT4', 'INT4')
elif db_type == 'mysql':
return SQLType('SIGNED INTEGER', 'BIGINT')
else:
return SQLType('INTEGER', 'INTEGER')
def convert_domain_child_mptt(self, domain, tables):
cursor = Transaction().cursor
table, _ = tables[None]
name, operator, ids = domain
red_sql = reduce_ids(table.id, ids)
Target = self.get_target()
left = getattr(Target, self.left).sql_column(table)
right = getattr(Target, self.right).sql_column(table)
cursor.execute(*table.select(left, right, where=red_sql))
where = Or()
for l, r in cursor.fetchall():
where.append((left >= l) & (right <= r))
expression = table.id.in_(table.select(table.id, where=where))
if operator == 'not child_of':
return ~expression
return expression
def convert_domain_child(self, domain, tables):
Target = self.get_target()
table, _ = tables[None]
name, operator, ids = domain
ids = list(ids) # Ensure it is a list for concatenation
def get_child(ids):
if not ids:
return []
children = Target.search([
(name, 'in', ids),
(name, '!=', None),
], order=[])
child_ids = get_child([c.id for c in children])
return ids + child_ids
expression = table.id.in_(ids + get_child(ids))
if operator == 'not child_of':
return ~expression
return expression
def convert_domain(self, domain, tables, Model):
Target = self.get_target()
table, _ = tables[None]
name, operator, value = domain[:3]
column = self.sql_column(table)
if '.' not in name:
if operator in ('child_of', 'not child_of'):
if Target != Model:
query = Target.search([(domain[3], 'child_of', value)],
order=[], query=True)
expression = column.in_(query)
if operator == 'not child_of':
return ~expression
return expression
if isinstance(value, basestring):
targets = Target.search([('rec_name', 'ilike', value)],
order=[])
ids = [t.id for t in targets]
elif not isinstance(value, (list, tuple)):
ids = [value]
else:
ids = value
if not ids:
expression = column.in_([None])
if operator == 'not child_of':
return ~expression
return expression
elif self.left and self.right:
return self.convert_domain_child_mptt(
(name, operator, ids), tables)
else:
return self.convert_domain_child(
(name, operator, ids), tables)
if not isinstance(value, basestring):
return super(Many2One, self).convert_domain(domain, tables,
Model)
else:
target_name = 'rec_name'
else:
_, target_name = name.split('.', 1)
target_domain = [(target_name,) + tuple(domain[1:])]
if 'active' in Target._fields:
target_domain.append(('active', 'in', [True, False]))
query = Target.search(target_domain, order=[], query=True)
return column.in_(query)
def convert_order(self, name, tables, Model):
if getattr(Model, 'order_%s' % name, None):
return super(Many2One, self).convert_order(name, tables, Model)
assert name == self.name
Target = self.get_target()
oname = 'id'
if Target._rec_name in Target._fields:
oname = Target._rec_name
if Target._order_name in Target._fields:
oname = Target._order_name
ofield = Target._fields[oname]
table, _ = tables[None]
target_tables = tables.get(name)
if target_tables is None:
target = Target.__table__()
target_tables = {
None: (target, target.id == self.sql_column(table)),
}
tables[name] = target_tables
return ofield.convert_order(oname, target_tables, Target)
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