def get_revision_of_object(obj):
"""
returns teh version of the passed object
@param obj:
@return:
"""
return getattr(obj, get_version_fieldname(obj))
def get_revision_of_object(obj):
"""
returns teh version of the passed object
@param obj:
@return:
"""
return getattr(obj, get_version_fieldname(obj))
def is_changed(obj):
"""
returns True if `obj` is changed or deleted on the database
:param obj:
:return:
"""
revision_field = get_version_fieldname(obj)
version = get_revision_of_object(obj)
return not obj.__class__.objects.filter(**{obj._meta.pk.name: obj.pk,
revision_field: version}).exists()
def is_changed(obj):
"""
returns True if `obj` is changed or deleted on the database
:param obj:
:return:
"""
revision_field = get_version_fieldname(obj)
version = get_revision_of_object(obj)
return not obj.__class__.objects.filter(**{obj._meta.pk.name: obj.pk,
revision_field: version}).exists()
def get_version(model_instance, version):
"""
try go load from the database one object with specific version
:param model_instance: instance in memory
:param version: version number
:return:
"""
version_field = get_version_fieldname(model_instance)
kwargs = {'pk': model_instance.pk, version_field: version}
return model_instance.__class__.objects.get(**kwargs)
def get_version(model_instance, version):
"""
try go load from the database one object with specific version
:param model_instance: instance in memory
:param version: version number
:return:
"""
version_field = get_version_fieldname(model_instance)
kwargs = {'pk': model_instance.pk, version_field: version}
return model_instance.__class__.objects.get(**kwargs)
