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In the real world, between refreshes of data, you would have to worry about issues such as saving the data between refreshes, informing the user about specific rows that failed to be saved (due to concurrency violations or otherwise), and most importantly, it s quite possible that the user might have the DataSet databound with a UI In this case, while it s certainly possible to fully refresh the DataSet and repopulate the UI, that might be an expensive operation for larger DataSets or, at the very least, the user might lose some of his changes Another situation could be a web service on a low bandwidth connection where, due to bandwidth restrictions, ferrying the entire DataSet at every single request is just not an option The approach you should take instead in that circumstance is to extract only a subset of the entire DataSet.

The new header.tpl in Listing 6-9 includes code to check the value of the $section variable to determine which section to highlight. We must now update each of the controller action templates so each one defines the $section variable. This is done when including the header template. For example, to highlight the Home link, the following code would be used to include header.tpl: {include file='header.tpl' section='home'} Note that we don t use $ in front of section when using a variable name as the attribute value in Smarty, but we do use it when referring to the variable in header.tpl. Listing 6-11 shows the updated version of index.tpl, which now highlights the corresponding entry in the main navigation. Note that there may be situations where no item is selected.

validate()

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This subset can then be merged with the original DataSet using the Merge method The subset will contain the changed rows that you were trying to save back to the database These can be extracted using the GetChanges method at the client side before sending the DataSet to the DataAdapter As you ll see in s 9, 10, and 11, these rows come back from the DataAdapter with information regarding success or failure of their save operation..

Listing 6-11. Highlighting the Home Link in the Header Template (index.tpl) {include file='header.tpl' section='home'} Web site home {include file='footer.tpl'}

This subset would also contain any new rows inserted or modified by any other user while your user was disconnected from the database and busy modifying his disconnected data cache. Given that your DataSet has a schema associated with itself, the added and modified rows are easily reconciled because information regarding these rows is present in the subset DataSet. The information that the subset DataSet will not, and cannot possibly contain is information about deleted rows2 that is, rows that were fetched in your disconnected cache in the first request, but were subsequently deleted from the database by some other user while you were blissfully ignorant of the changes by virtue of being disconnected from the database. It s for this purpose that you can leverage the IndexOf method on DataRowCollection to clearly identify if any DataRows have moved upward. Upward movement of a DataRow s index signifies that the DataRow immediately before itself has been deleted from the database; thus, you need to write code to remove them from your disconnected cache. This way you can keep your disconnected data cache refreshed, including deleted records, without having to ferry huge amounts of data back and forth every time between your database and your DataSet. Or if your DataSet isn t too large, you could simply use a schema and keep reloading your entire DataSet every time, and avoid all this hassle.

This method is run for all saves (both create and update). Override this method in your class to provide validations, and use errors.add(attribute, msg) to register validation errors. ActiveRecord::Validations::ClassMethods contains several higher level validation helper methods.

Note Try updating each of the other controller action templates so the correct section is highlighted.

In Exercise 7.4, one of the parameters specified to the FillSchema method was the mapping method used. You could specify either the mapping to be defined elsewhere, or you could instruct the DataAdapter to use the mapping specified in the source of the data. Next, let s examine mapping of various table and column names in detail.

validate_on_create()

You can check what the value needs to be by checking the header.tpl file. Specifically, you will need to update each of the files in the ./templates/account directory to use {include file='header.tpl' section='account'} rather than {include file='header.tpl'}. This is fairly simple to test, since you only need to visit each page and check that the navigation is highlighted properly. Alternatively, you can download the source code for this chapter.

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