.NET CORE API如何批量修改

Question

这里要实现的是购物的收货地址 API

问题是：当选择一个为默认true时,其他为true的改为false

请大佬看下这个修改如何写

接口层：
Task<WsUserAddressViewModel> UpdateViewModel(WsUserAddressViewModel model);

服务层：
public async Task<WsUserAddressViewModel> UpdateViewModel(WsUserAddressViewModel model)
                {
                        var entity = model.ToEntity();
                        _repository.Update(entity);
                        await _context.SaveChangesAsync();
                        return model;
                }

Controller:

Answer 1

var defaultWsUserAddress =_context.WsUserAddress.Where(e=>e.IsDefault);
foreach(var address in defaultWsUserAddress)
{
    address.IsDefault = false;
}
await _context.SaveChangesAsync();