Cédric Krier
4d58b3a720
The getter of the Binary field could be called many times in the same transaction, so popping out the format from the context create a side effect that changes the requested format. issue3774 review19981002
83 lines
2.7 KiB
Python
83 lines
2.7 KiB
Python
# This file is part of Tryton. The COPYRIGHT file at the top level of
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# this repository contains the full copyright notices and license terms.
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from sql import Query, Expression
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from .field import Field, SQLType
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from ...transaction import Transaction
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from ... import backend
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class Binary(Field):
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'''
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Define a binary field (``bytes``).
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'''
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_type = 'binary'
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cast = bytearray if bytes == str else bytes
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def __init__(self, string='', help='', required=False, readonly=False,
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domain=None, states=None, select=False, on_change=None,
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on_change_with=None, depends=None, filename=None, context=None,
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loading='lazy'):
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if filename is not None:
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self.filename = filename
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if depends is None:
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depends = [filename]
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else:
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depends.append(filename)
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super(Binary, self).__init__(string=string, help=help,
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required=required, readonly=readonly, domain=domain, states=states,
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select=select, on_change=on_change, on_change_with=on_change_with,
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depends=depends, context=context, loading=loading)
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@classmethod
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def get(cls, ids, model, name, values=None):
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'''
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Convert the binary value into ``bytes``
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:param ids: a list of ids
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:param model: a string with the name of the model
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:param name: a string with the name of the field
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:param values: a dictionary with the read values
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:return: a dictionary with ids as key and values as value
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'''
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if values is None:
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values = {}
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res = {}
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converter = cls.cast
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default = None
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format_ = Transaction().context.get(
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'%s.%s' % (model.__name__, name), '')
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if format_ == 'size':
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converter = len
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default = 0
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for i in values:
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value = i[name]
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if value:
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if isinstance(value, unicode):
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value = value.encode('utf-8')
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value = converter(value)
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else:
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value = default
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res[i['id']] = value
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for i in ids:
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res.setdefault(i, default)
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return res
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@staticmethod
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def sql_format(value):
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if isinstance(value, (Query, Expression)):
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return value
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db_type = backend.name()
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if db_type == 'postgresql' and value is not None:
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import psycopg2
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return psycopg2.Binary(value)
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return value
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def sql_type(self):
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db_type = backend.name()
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if db_type == 'postgresql':
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return SQLType('BYTEA', 'BYTEA')
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elif db_type == 'mysql':
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return SQLType('LONGBLOB', 'LONGBLOB')
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return SQLType('BLOB', 'BLOB')
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