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All the HTML generated is sent to the browser, in which the Hello World image will be displayed with a tiny red dot between the words Hello and World. That s all there is to it. Load the URL of this script (http://localhost/cgi-bin/pythonms_hello.py in the development environment) and execute it. This should display the image shown in Figure 7-1, in which you should see the same yellowish rectangle (with the words Hello World printed at the center) as you saw when you loaded hello.html.

:method => :delete } %></td> </tr> <% end %> </table> <br /> <%= link_to 'New interest', new_interest_path %> Of course, this view is meaningless without the ability to add an interest, so the next step is to update the movie show page with a form, as shown in Listing 3-32. Listing 3-32. Adding the interest creation form to app/views/movies/show.html.erb ... <% if logged_in %> <% unless current_user.interested_in (@movie) %> <% form_for current_user.interests.build(:movie => @movie) do |f| %> <%= f.hidden_field :movie_id %> <%= content_tag :button, 'Add this as an interest', :type => 'submit' %> <% end %> <% else %> <p>You have added this movie as an interest</p> <% end %> <% end %> This heavily nested code checks to see if the current user is logged in; if so, and if the current user is not already interested in the given movie, the system will display a form button for the user to add it as a new interest, as shown in Figure 3-6. If the user is interested in the movie, she ll just see a message to that effect and if the user isn t even logged in, she won t see anything.

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The application in the previous section confirmed that MapScript was built properly and demonstrated some fundamental MapScript functions, but it didn t provide a very useful or interesting map. In this section, you ll explore MapScript functionality more deeply and produce an interactive map. You ll employ the same method as last time that is, the initial definition of map parameters will be taken from a mapfile but subsequently, you ll make changes to some of these parameters so that the application behaves the same way as its CGI-based parent. The mapfile used will be third.map. The code for this example is found in the file pythonms_third.py and is available in the source distribution downloadable from the Apress website. The code is shown in Listing 7-2. This script begins the same way as the previous one that is, the modules mapscript and random are loaded. In addition, the cgi module is loaded, the methods of which give convenient access to CGI form variables. In the next section, Lines 010 through 027 convert the image coordinates of a point (in pixels) to geographic coordinates (these can take several forms, the most common of which are degrees and meters). Initially, the script is invoked from the Location bar of the browser. This means that a form doesn t yet exist to pass CGI parameter values to the script. You have to set default values for these parameters so that MapScript knows what to do the first time the script is invoked. This is done in Lines 032 through 059. The relevant code is shown in the following code snippet.

import javax.annotation.PostConstruct; import javax.faces.event.ActionEvent;

The web page generated by this script will invoke itself it s identified in Line 026 so you don t lose track of what s executing pythonms_third.py. Lines 028 through 030 identify the path to the mapfile, the mapfile itself, and the path to images created by this script. 026 028 029 030 script_name = "/cgi-bin/pythonms_third.py" map_path = "/home/mapdata/" map_file = "third.map" img_path = "/var/www/htdocs/tmp/"

The only thing left to do here is to add the interested_in method to the User model, as shown in Listing 3-33, since it controls whether the form or the confirmation message is displayed. Listing 3-33. Adding interested_in to app/models/user.rb class User < ActiveRecord::Base # ... def interested_in (movie) interests.detect {|interest| interest.movie_id == movie.id} end protected # ... end This method will iterate over a user s interests and return the first one where the provided movie is found or, if no match is found, it will return nil. And with that, your MovieList users can manage their interests!

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