public async Task <BlogViewModel> UpdateBlogWithConstraintAsync(BlogViewModel blogVM)
{
// begin transaction
using (var transaction = this.UnitOfWork.CreateTransac())
{
try
{
// after binding tag from db
// Update blog and binding blog tag
var updateBlogResult = await UpdateAsync(blogVM.Id, blogVM);
// Remove all list blog tag
var listCurrentBlogTagVM = await blogTagService.GetActive(x => x.BlogId == blogVM.Id).ToListAsync();
foreach (var currentBTVM in listCurrentBlogTagVM)
{
await blogTagService.DeleteByObjAsync(currentBTVM);
}
// finding tag title and make sure create new tag if it does exist
List <TagViewModel> listTagVM = new List <TagViewModel>();
foreach (var title in blogVM.Tags)
{
var blogTagVM = new BlogTagViewModel()
{
BlogId = updateBlogResult.Id,
Active = true
};
var existTag = await tagService.FirstOrDefaultActiveAsync(x => x.Title.Equals(title, StringComparison.OrdinalIgnoreCase));
if (existTag == null)
{
// if title does not exist, create new tag with this title and add to list
var result = await tagService.CreateAsync(new TagViewModel()
{
Title = title, Active = true
});
blogTagVM.TagId = result.Id;
await blogTagService.CreateAsync(blogTagVM);
}
else
{
// if title does exist tag add to list tag VM
blogTagVM.TagId = existTag.Id;
await blogTagService.CreateAsync(blogTagVM);
}
}
transaction.Commit();
return(updateBlogResult);
}
catch (Exception ex)
{
transaction.Rollback();
throw ex;
}
}
}
public JsonResult Delete(BlogTagViewModel data)
{
new BlogTags().Delete(data.Tag);
return(Json(true));
}
public BlogTag(BlogTagViewModel blogTagVm)
{
BlogId = blogTagVm.BlogId;
TagId = blogTagVm.TagId;
}