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is an implicitly empty argument for methods (implied by the method keyword), but Jacques Garrigues (who implemented the object system in OCaml) uses both. In many of his libraries (the lablgtk library in particular), he uses the added empty unit argument when the method alters the object s state or must be called from a callback function. In the callback function, the argument is specified to distinguish the method from the application of the method. These are conventions of programmers instead of rules of the language.

For this chapter s example, you ll probably find that the database queries do not take nearly as long to run as the html2ps and ps2pdf calls, so further optimization is probably unnecessary. However, this won t always be the case. If either the meetings or the users table were much larger, or if you had a more complicated query with more relationships, you might need to make the queries go faster. You can speed up the queries in a few ways. For example, the call to user.meetings.count means that you have one extra SQL query per user. This could be a problem when you need to count a large number of records. Fortunately, Rails can automatically cache the count of relationships for you. In the example, this approach won t work. That s because SugarCRM won t update the cache for you, and since it will be updating the table, that would leave you with an invalid cache. However, in situations where only your Rails application accesses the database, adding a counter cache could speed up your report s performance significantly. Counter caching has a few caveats. One is that the counter may be invalid if your database is accessed outside your Rails applications. Also, it won t work if you manually set association IDs instead of using association proxies. You can find out more about using counter caches at http://wiki. rubyonrails.org/rails/pages/MagicFieldNames. You can create a counter cache by adding a column called meetings_count, with a default value of 0, to the users table. You also need to add a :counter_cache=>true option to the relationship in the Meetings model. The Meetings model would then look like this:

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We ll discuss this page in a moment, but for now simply try out the Suggest textbox and then click an entry. After you ve selected a search result, click the Go button, and you ll be sent to DestinationPage.aspx, shown in Figure 4-9. This page will be the end of the road for our presentation layer and will do nothing more than display the selected results that were passed in as a parameter.

I can create a new instance of the class and always initialize the library properly. # class random = object method int x = Random.int x method float x = Random.float x method rand () = Random.float 1. initializer Random.self_init ();Printf.printf "Random Constructor\n" end;; class random : object method float : float -> float method int : int -> int method rand : unit -> float end # let rnum = new random;; Random Constructor val rnum : random = <obj> # rnum#int 6;; - : int = 4 # rnum#float 100.;; - : float = 82.8656205913089678 # rnum#rand ();; - : float = 0.0700932072180878579 #

Some databases, like PostgreSQL and MySQL 5, support triggers. In that case, you may also be able to use triggers to automatically update your counter cache whenever the associated table is changed, even if it s changed by SugarCRM or another non-Rails application. For details, consult your database documentation. You can also see a simple example of using MySQL triggers at http://www. phpied.com/mysql-triggers/. Also notice that this example does not have one large, custom SQL query, which is unlike many of the other examples in this book. Calculating using custom SQL queries, rather than by using Active Record methods, has two advantages: you can use the database to extract complicated information, which would be harder to code in Ruby, and you can often make custom SQL queries that are faster than the autogenerated queries that Active Record creates behind the scenes. Sometimes, you can squeeze multiple calls by Active Record into just one SQL query. It s possible to turn this example into a custom SQL query. You can do that in a few ways, but they all require either subqueries or temporary tables. Here s a replacement query loop that uses custom SQL:

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