/// <summary>
/// 判断用户是否有指定数据的所有权
/// 如果部分数据不存在，会返回false
/// </summary>
/// <typeparam name="TData">数据类型</typeparam>
/// <param name="userId">用户Id</param>
/// <param name="ids">数据Id列表</param>
/// <returns></returns>
public virtual bool HasOwnership <TData>(long userId, IList <object> ids)
where TData : class, IEntity
{
// 检查数据类型是否有所属用户
var userOwnedTrait = UserOwnedTrait.For <TData>();
if (!userOwnedTrait.IsUserOwned)
{
throw new ArgumentException(string.Format("type {0} not user owned", typeof(TData).Name));
}
// 构建表达式 (data => ids.Contains(data.Id) && data.Owner.Id == userId)
var entityTrait = EntityTrait.For <TData>();
var userEntityTrait = EntityTrait.For <User>();
var dataParam = Expression.Parameter(typeof(TData), "data");
var body = Expression.AndAlso(
Expression.Call(
IListContainsMethodInfo.Value,
Expression.Constant(ids.Select(id =>
id.ConvertOrDefault(entityTrait.PrimaryKeyType, null)).ToList()),
Expression.Convert(
Expression.Property(dataParam, entityTrait.PrimaryKey), typeof(object))),
Expression.Equal(
Expression.Property(
Expression.Property(dataParam, userOwnedTrait.PropertyName),
userEntityTrait.PrimaryKey),
Expression.Constant(userId)));
var count = UnitOfWork.ReadData <TData, long>(r => {
return(r.Count(Expression.Lambda <Func <TData, bool> >(body, dataParam)));
});
return(count == ids.Count);
}
/// <summary>
/// 按所属用户等于指定用户过滤数据
/// </summary>
/// <typeparam name="TData">数据类型</typeparam>
/// <param name="query">查询对象</param>
/// <param name="userId">用户Id</param>
/// <returns></returns>
public static IQueryable <TData> FilterByOwnedUser <TData>(
this IQueryable <TData> query, long userId)
{
// 构建表达式 (data => data.Owner.Id == userId)
var userOwnedTrait = UserOwnedTrait.For <TData>();
var userEntityTrait = EntityTrait.For <User>();
var dataParam = Expression.Parameter(typeof(TData), "data");
var body = Expression.Equal(
Expression.Property(
Expression.Property(dataParam, userOwnedTrait.PropertyName),
userEntityTrait.PrimaryKey),
Expression.Constant(userId));
return(query.Where(Expression.Lambda <Func <TData, bool> >(body, dataParam)));
}
/// <summary>
/// 设置数据的所属用户到当前登录用户
/// </summary>
/// <param name="context">数据库上下文</param>
/// <param name="data">数据</param>
protected virtual void AssignOwnedUser(IDatabaseContext context, TData data)
{
// 通过指定的数据库上下文获取当前登录用户
var sessionManager = Application.Ioc.Resolve <SessionManager>();
var session = sessionManager.GetSession();
var user = context.Get <User>(u => u.Id == session.ReleatedId);
if (user == null)
{
throw new NullReferenceException("Get user failed");
}
// 设置所属用户到当前登录用户
var userOwnedTrait = UserOwnedTrait.For <TData>();
if (!userOwnedTrait.IsUserOwned)
{
throw new ArgumentException(string.Format("type {0} not user owned", typeof(TData).Name));
}
ReflectionUtils.MakeSetter <TData, User>(userOwnedTrait.PropertyName)(data, user);
}
