This sounds like the dirty object feature of Rails 2.1 would work great: http://ryandaigle.com/articles/2008/3/31/what-s-new-in-edge-rails-dirty-objects
Maybe even try to utilize some callback methods so you can capture and display the changes to the user: http://railsforum.com/viewtopic.php?id=23001 On Nov 5, 10:38 pm, Franz <[EMAIL PROTECTED]> wrote: > I want to accomplish the following. I have an object that can be > edited. However, it can occur that two people might edit the object > at the same time. Instead of locking the object down, I prefer to > tell the user how their version differs from the last version that was > committed. > > Kinda like: > > respond_to do |format| > @document = Document.find_by_id(1) > @document.attributes = params[:document] > @changes = @document.diff(Document.find_by_id(1)) > format.html { render :action => "edit" } > end > > The edit screen then renders the changes for the user to compare. The > user can then apply some changes or ignore the changes and save. > > This works fine for regular fields, but when the object has has_many > assoctiations, then the following would occur. > > respond_to do |format| > @document = Document.find_by_id(1) > @document.attributes = params[:document] # => this call would > update the database for all has_many associations > @changes = @document.diff(Document.find_by_id(1)) #=> retrieving > the previous object state from the database is not possible since the > associations have changed > format.html { render :action => "edit" } > end > > I also tried to compare the object to the attributes kinda like this; > > respond_to do |format| > @document = Document.find_by_id(1) > @changes = @document.diff(params[:document]) > format.html { render :action => "edit" } > end > > But then the user's changes aren't stored on the object and all > updates are lost. > > Any help is appreciated. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
