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Note that paginate takes a hash argument with key :page and value equal to the page requested Userpaginate pulls the users out of the database one chunk at a time (30 by default), based on the :page parameter So, for example, page 1 is users 1 30, page 2 is users 31 60, etc We can paginate the users in the sample application by using paginate in place of all in the index action (Listing 1028) Here the :page parameter comes from params[:page], which is generated automatically by will_paginate

class UsersController < ApplicationController before_filter :authenticate, :only => [:index, :edit, :update] def index @title = "All users" @users = Userpaginate(:page => params[:page]) end end

This section provides a brief overview of slush and a look at just enough of the commands and features we need to load and run the example applications at the end of this chapter and later chapters A more complete description of slush is provided in the Slushtxt le included in the SDK

The user index page should now be working, appearing as in Figure 1010; because we included will_paginate both above and below the user list, the pagination links appear in both places If you now click on either the 2 link or Next link, you ll get the second page of results, as shown in Figure 1011

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Slush is a small command shell intended to provide a UNIX-like interface to TINI s runtime environment by providing Serial (TTY), Telnet, and FTP servers Slush is itself a Java application that is interpreted by TINI s JVM Slush is less than a full operating system but more than a simple shell It provides a way to

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Testing Pagination Testing pagination requires detailed knowledge of how will_paginate works, so we did the implementation first, but it s still a good idea to test it To do this, we need to invoke pagination in a test, which means making more than 30 (factory) users As before, we ll use Factory Girl to simulate users, but immediately we have a problem: user email addresses must be unique, which would appear to require creating more than 30 users by hand a terribly cumbersome job Fortunately, Factory Girl anticipates this issue, and provides sequences to solve it, as shown in Listing 1029

Page 2 of the user index (/users page=2)

2

Factorydefine :user do |user| username "Michael Hartl" useremail "mhartl@examplecom" userpassword "foobar" userpassword_confirmation "foobar" end Factorysequence :email do |n| "person-#{n}@examplecom" end

view and manipulate the le system, run other Java applications, and control system functions such as the watchdog timer and network con guration Slush is designed to be a multi-threaded, multi-user system allowing simultaneous user sessions It is typically used in the development phase It provides conveniences such as network accessibility using the ubiquitous networking client application Telnet for user interaction and FTP for transferring applications and data les to and from the le system After an application has been developed and debugged, it is typically built and targeted for installation in the ash ROM, replacing slush Transitioning an application from the development phase to production deployment is discussed in 11

This arranges to return email addresses like person-1@examplecom, person2@examplecom, etc, which we invoke using the next method:

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