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After running the Rake task, our application has 100 sample users, as seen in Figure 109 (I ve taken the liberty of associating the first few sample addresses with photos so that they re not all the default Gravatar image)

portion of TINI s heap See Section 131 for details of the memory map Next type FILL 0 and hit Enter

Having solved the problem of too few sample users, we now encounter the opposite problem: having too many users on a page Right now there are a hundred, which is already a reasonably large number, and on a real site it could be thousands The solution is to paginate the users, so that (for example) only 30 show up on a page at any one time There are several pagination methods in Rails; we ll use one of the simplest and most robust, called will_paginate To use it, we need to update the Gemfile as usual (Listing 1026)

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SELECT reviewid, reviewreview_xml FROM review, review_person, person AS reviewer, review_movie, movie, movie_person_role, person_role, role, person AS actor WHERE reviewreview_id = review_personreview_id AND reviewerperson_id = review_personperson_id AND review_moviereview_id = reviewreview_id AND moviemovie_id = review_moviemovie_id AND moviemovie_id = movie_person_rolemovie_id AND person_roleperson_role_id = movie_person_roleperson_role_id AND rolerole_id = person_rolerole_id AND actorperson_id = person_roleperson_id AND moviemovie_date > '1990-12-31' AND moviemovie_date < '1995-01-01' AND reviewerperson_name LIKE '%Ebert%' AND rolerole_name = 'Actor' AND actorperson_name = 'Alec Baldwin';

This rather cryptic two-step sequence lls the low 64K of heap with 0s, forcing the OS to initialize the heap, le system, and all other persistent settings Now we re ready to boot the system for the rst time To exit the serial loader and boot the TINI runtime, type EXIT at the prompt These are the rst few lines of text generated by the OS early in the boot process

source 'http://rubygemsorg' gem gem gem gem 'rails', '300' 'sqlite3-ruby', '125', :require => 'sqlite3' 'gravatar_image_tag', '010' 'will_paginate', '30pre2'

Then bundle install:

----> TINI Boot <---TINI OS 102 API Version 8009 Copyright (C) 1999 - 2001 Dallas Semiconductor Corporation

With will_paginate installed, we are now ready to paginate the results of finding users We ll start by adding the special will_paginate method in the view (Listing 1027); we ll see in a moment why the code appears both above and below the user list

The database can reliably answer our request; why you would want to ask this request is another issue

The system boot ow is described in detail in Section 145 After a couple of seconds the system will have completely booted, and the following prompt is displayed by slush

<h1>All users</h1> <%= will_paginate %> <ul class="users"> <% @userseach do |user| %> <li> <%= gravatar_for user, :size => 30 %> <%= link_to username, user %> </li>

The will_paginate method is a little magical; inside a users view, it automatically looks for an @users object, and then displays pagination links to access other pages The view in Listing 1027 doesn t work yet, though, because currently @users contains the results of Userall (Listing 1020), which is of class Array, whereas will_paginate expects an object of class WillPaginate::Collection Happily, this is just the kind of object returned by the paginate method supplied by the will_paginate gem:

Welcome to slush TINI login: (Version 102)

$ rails console >> Userallclass => Array >> Userpaginate(:page => 1)class => WillPaginate::Collection

As a bonus, we've also addressed the dead link issue Because all the links between your documents are mirrored in a database that enforces the integrity of that structure, it's much more difficult to have a bad link If an author tries to insert a link to a nonexistent movie or review, the database rejects it because it will breach relational integrity to do so Your authoring interface should give the author some kind of helpful error message, such as "the requested link target does not exist" Again, this leverages the power of the relational database You won't have to do as much link checking if you know that your database is humming away in the background, ensuring the integrity of your intradocument links

The next section provides a brief introduction to slush that will cover, among other things, the login process

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