/// <summary>
/// 查询子级分类
/// </summary>
/// <param name="parentId">父级分类id</param>
/// <param name="recursive">是否无限向下查询</param>
/// <returns></returns>
protected async Task <List <CourseCategory> > FindChildrenAsync(long?parentId, bool recursive = false)
{
if (!recursive)
{
return(await EntityRepo.GetAllListAsync(ou => ou.ParentId == parentId));
}
if (!parentId.HasValue)
{
return(await EntityRepo.GetAllListAsync());
}
var code = await GetCodeAsync(parentId.Value);
return(await EntityRepo.GetAllListAsync(
ou => ou.Code.StartsWith(code) && ou.Id != parentId.Value
));
}
/// <summary>
/// 获取最后一个分类
/// </summary>
/// <param name="parentId"></param>
/// <returns></returns>
protected virtual async Task <CourseCategory> GetLastChildOrNullAsync(long?parentId)
{
var children = await EntityRepo.GetAllListAsync(ou => ou.ParentId == parentId);
return(children.OrderBy(c => c.Code).LastOrDefault());
}
