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PORepository pattern and many cascading changes
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copied!<p>I need to cascade many changes when updating an entity. I could do it like below, but that is ugly imho (too many parameters already and counting).</p> <pre><code>public class PageRepository : IPageRepository { public void Update(Page page, string oldPath, PageState oldState, IEnumerable<Tag> oldTags /* Maybe even more stuff */) { using(var t = session.BeginTransaction()) { if(/* path has changed */) { // move descendant pages } if(/* state has changed to public */) { // publish hidden descendant pages } if(/* state has changed to non-public */) { // hide public descendant pages } if(page is ITaggable) { foreach(var tag in ((ITaggable)page).Tags.Except(oldTags)) { // increase tag count in ancestor pages } foreach(var tag in oldTags.Except(((ITaggable)page).Tags)) { // decrease tag count in ancestor pages } } // ... session.Update(page); t.Commit(); } } } </code></pre> <p>Is there any pattern that could help making that cleaner?</p> <p>I have already thought about splitting that to multiple methods</p> <pre><code>pageRepo.BeginTransaction(); pageRepo.Update(page); if(/* path has changed */) { pageRepo.MoveDescendants(page, oldPath); } // ... pageRepo.Commit(); </code></pre> <p>but I don't like that manual transaction handling. Another idea I got is</p> <pre><code>using(var batch = pageRepo.CreateUpdateBatch(page)) { if(/* path has changed */) { batch.MoveDescendants(oldPath); } // ... batch.Commit(); } </code></pre>

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