private void detach_groups_relation(groups_relation entity)
{
this.SendPropertyChanging();
entity.user = null;
}
partial void Deletegroups_relation(groups_relation instance);
partial void Insertgroups_relation(groups_relation instance);
partial void Updategroups_relation(groups_relation instance);
private void attach_groups_relation(groups_relation entity)
{
this.SendPropertyChanging();
entity.groups = this;
}