110 lines
4.2 KiB
Python
110 lines
4.2 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 trytond.model import ModelStorage
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class ModelSingleton(ModelStorage):
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"""
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Define a singleton model in Tryton.
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"""
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def get_singleton_id(self, cursor, user, context=None):
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'''
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Return the id of the unique record if there is one.
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:param cursor: the database cursor
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:param user: the user id
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:param context: the context
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'''
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singleton_ids = super(ModelSingleton, self).search(cursor, user, [],
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limit=1, context=context)
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if singleton_ids:
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return singleton_ids[0]
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return False
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def create(self, cursor, user, values, context=None):
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singleton_id = self.get_singleton_id(cursor, user, context=context)
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if singleton_id:
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self.write(cursor, user, singleton_id, values, context=context)
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else:
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singleton_id = super(ModelSingleton, self).create(cursor,
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user, values, context=context)
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return singleton_id
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def read(self, cursor, user, ids, fields_names=None, context=None):
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singleton_id = self.get_singleton_id(cursor, user, context=context)
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if not singleton_id:
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res = self.default_get(cursor, user, fields_names, context=context,
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with_rec_name=False)
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if not isinstance(ids, (int, long)):
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res['id'] = ids[0]
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res = [res]
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else:
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res['id'] = ids
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return res
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if isinstance(ids, (int, long)):
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ids2 = singleton_id
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else:
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ids2 = [singleton_id]
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res = super(ModelSingleton, self).read(cursor, user, ids2,
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fields_names=fields_names, context=context)
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if isinstance(ids, (int, long)):
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res['id'] = ids
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else:
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res[0]['id'] = ids[0]
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return res
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def write(self, cursor, user, ids, values, context=None):
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singleton_id = self.get_singleton_id(cursor, user, context=context)
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if not singleton_id:
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return self.create(cursor, user, values, context=context)
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if isinstance(ids, (int, long)):
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ids = singleton_id
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else:
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ids = [singleton_id]
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return super(ModelSingleton, self).write(cursor, user, ids, values,
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context=context)
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def delete(self, cursor, user, ids, context=None):
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singleton_id = self.get_singleton_id(cursor, user, context=context)
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if not singleton_id:
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return True
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if isinstance(ids, (int, long)):
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ids = singleton_id
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else:
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ids = [singleton_id]
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return super(ModelSingleton, self).delete(cursor, user, ids,
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context=context)
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def copy(self, cursor, user, ids, default=None, context=None):
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if default:
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self.write(cursor, user, ids, default, context=context)
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return ids
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def search(self, cursor, user, domain, offset=0, limit=None, order=None,
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context=None, count=False):
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res = super(ModelSingleton, self).search(cursor, user, domain,
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offset=0, limit=None, order=None, context=None, count=False)
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if not res:
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if count:
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return 1
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return [1]
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return res
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def default_get(self, cursor, user, fields_names, context=None,
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with_rec_name=True):
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res = super(ModelSingleton, self).default_get(cursor, user,
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fields_names, context=context, with_rec_name=with_rec_name)
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singleton_id = self.get_singleton_id(cursor, user, context=context)
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if singleton_id:
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if with_rec_name:
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fields_names = fields_names[:]
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for field in fields_names[:]:
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if self._columns[field]._type in ('many2one',):
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fields_names.append(field + '.rec_name')
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res = self.read(cursor, user, singleton_id,
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fields_names=fields_names, context=context)
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for field in (x for x in res.keys() if x not in fields_names):
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del res[field]
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return res
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