private async Task <ArticleDto> UpdateArticleAsync(CreateOrUpdateArticleDto input)
{
var entity = await _articleRepository.FirstOrDefaultAsync(c => c.Id == input.Id.Value);
await _articleRepository.EnsureCollectionLoadedAsync(entity, c => c.Categories);
if (entity == null)
{
throw new ArgumentException("找不到指定的文章");
}
Mapper.Map(input, entity);
//找出该文章的所有分类（中间表Id，分类Id）
var artCategorys = await _articleToCategoryRepository.GetAll().AsNoTracking().Where(c => c.ArtId == input.Id).ToListAsync();
var inputIdList = input.CatetoryIds.ToList();
foreach (var category in artCategorys)
{
//删除输入没有，但是原来分类有的分类
if (!inputIdList.Contains(category.CatId))
{
//输入中没有该分类了,直接删除中间表
// entity.Categories.Remove(category);
await _articleToCategoryRepository.DeleteAsync(c => c.Id == category.Id);
}
else
{
//包含，说明没有变动，该分类不需要处理,从输入中移除
inputIdList.Remove(category.CatId);
}
}
//inputIdList中剩下的就是需要新增的。
var categorys = await _categoryRepository.GetAll().AsNoTracking().Where(c => inputIdList.Contains(c.Id)).ToListAsync();
if (inputIdList.Any())
{
foreach (var catId in inputIdList)
{
CreateArticleToCategory(catId, entity);
}
}
// await _articleRepository.EnsureCollectionLoadedAsync(entity, c => c.Categories);
await _articleRepository.UpdateAsync(entity);
await SaveChangeAsync();
return(Mapper.Map <ArticleDto>(entity));
}
public async Task <ArticleDto> CreateOrEditArticleAsync(CreateOrUpdateArticleDto input)
{
if (input.Id.HasValue)
{
return(await UpdateArticleAsync(input));
}
return(await CreateArticleAsync(input));
}
public async Task CreateOrUpdateArticle(CreateOrUpdateArticleDto input)
{
if (input.Id.HasValue)
{
var article = _articleRepository.Get(input.Id.Value);
article = input.MapTo(article);
article.CategoryId = 1;
await _articleRepository.UpdateAsync(article);
}
else
{
var article = input.MapTo <Article>();
article.CategoryId = 1;
await _articleRepository.InsertAsync(article);
}
}
private async Task <ArticleDto> CreateArticleAsync(CreateOrUpdateArticleDto input)
{
var entity = Mapper.Map <Article>(input);
entity.UserId = BlogSession.UserId ?? throw new Exception("用户未登录到系统。");
await _articleRepository.InsertAndGetIdAsync(entity);
if (input.CatetoryIds.Any())
{
foreach (var id in input.CatetoryIds)
{
CreateArticleToCategory(id, entity);
}
}
await SaveChangeAsync();
return(Mapper.Map <ArticleDto>(entity));
}
