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The three simplest of these functions behave exactly like their typeof equivalents:

Editing the templates for the results resource will also be old hat to you at this point, so we ll whip through these fairly quickly. First, we ll generate the same two partials that we have for previous resources and modify the standard templates to use them. Second, because this is a nested resource, we ll also modify any of our named routes to pass the @goals variable as well. Create a new partial named /app/views/results/_form.rhtml: <p><label for="">Date</label><br /> <%= f.date_select :date %></p> <p><label for="">Value</label><br /> <%= f.text_field :value %></p> <p><%= submit_tag "Save" %></p> Next, we ll create the results partial to display our collection of results. Create _result.rhtml in /app/views/results/, and place the following content in it: <tr> <td><%=h result.date.to_s(:long) %></td> <td><%=h result.value %></td> <td><%=link_to image_tag("edit_photo.gif", {:title => "Edit Result Details"}), edit_result_path(@goal, result) %></td> <td><%= link_to image_tag("delete_photo.gif", {:title => "Delete Result"}), result_path(@goal, result), :confirm => 'Are you sure ', :method => :delete %></td> </tr>

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require 'gruff' require 'active_record' game_id_to_analyze = 5 ActiveRecord::Base.establish_connection( :adapter => 'mysql', :host => 'localhost',

Object.isString("foo"); Object.isNumber("foo"); Object.isFunction($); //-> true //-> false //-> true;

:username => 'your_mysql_username_here', :password => 'your_mysql_password_here', :database => 'players_4')

Object.isNumber(4); //-> true Object.isNumber(3 + 9); //-> true Object.isNumber("3" + 9); //-> false

Now, we ll modify our templates to utilize these partials. Edit /app/views/results/ new.rhtml to look like this: <h1>New result</h1> <%= error_messages_for :result %> <% form_for(:result, :url => results_path(@goal)) do |f| %> <%= render :partial => 'form', :locals => {:f => f} %> <% end %> <%= link_to 'Back', results_path(@goal) %> And edit /app/views/results/edit.rhtml to look like this: <h1>Editing result</h1> <%= error_messages_for :result %> <% form_for(:result, :url => result_path(@goal, @result), :html => { :method => :put }) do |f| %> <%= render :partial => 'form', :locals => {:f => f} %> <% end %> <%= link_to 'Back to Goal', goal_path(@goal) %> Meanwhile, the results index page (/app/views/results/index.rhtml) should look like this: <h1>Listing results for <%= h @goal.name %></h1> <table> <tr><th>Date</th><th>Value</th></tr> <%= render :partial => 'result', :collection => @results %> </table> <br /> <%= link_to 'Back to Goal', goal_path(@goal) %> Finally, we can wrap up these templates by building the goals show template, which will utilize our two new results partials. Edit /app/views/goals/show.rhtml to look like this: <h1>Results for <%= h @goal.name %> </h1> <table> <tr><th>Date</th><th>Value</th></tr> <%= render :partial => 'results/result', :collection => @results %> </table>

Skeptics may wonder why these methods are defined at all if the behavior is identical to typeof, why not use typeof instead These methods are slightly shorter to type than the alternative, but they exist mostly so that you ll get out of the habit of using typeof. If that bothers you, feel free to ignore them for philosophical reasons.

class Player < ActiveRecord::Base has_many :wins end class Game < ActiveRecord::Base has_many :wins end class Play < ActiveRecord::Base belongs_to :game belongs_to :player end class Event < ActiveRecord::Base belongs_to :play end def puts_underlined(text, underline_char="=") puts text puts underline_char * text.length end pic_dir='./all_players_graph_pics' Dir.mkdir(pic_dir) unless File.exists (pic_dir) line_chart = Gruff::Line.new(1024) index=0 columns = {} Event.find(:all, :group=>'event DESC').each do |e| columns[index] = e.event index=index+1 end line_chart.labels = columns line_chart.legend_font_size = 10

Here s another nugget of JavaScript trivia, in case you didn t know: null and undefined are two separate values. If you asked to borrow a dollar, null would be a firm, loud reply of No! ; undefined would be a distant stare, as if I hadn t heard your question. In other words, undefined means that a value has not been set for a variable, and null means that the value has been explicitly set to nothing. For example, if I omit a named argument from a function, it will be set to undefined:

line_chart.legend_box_size = 10 line_chart.title = "Chart of All Players" line_chart.minimum_value = 0 line_chart.maximum_value = 110 Player.find(:all).each do |player| total_games = Play.count(:conditions=>['game_id = AND player_id = ', game_id_to_analyze, player.id]).to_f total_wins = Play.count(:conditions=>['game_id = AND player_id = AND won=1', game_id_to_analyze, player.id]).to_f sql = "SELECT event, avg(time) as average_time FROM events as e INNER JOIN plays as p ON e.play_id=p.id WHERE p.game_id='#{game_id_to_analyze}' AND p.player_id='#{player.id}' GROUP BY e.event DESC;" data = [] Event.find_by_sql(sql).each do |row| data << (row.average_time.to_i/1000) end line_chart.data(player.name, data end line_chart.write("all_players.png") )

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