Add support for commenting on, and replying to, diary entries.

app/controllers/diary_entry_controller.rb

@@ -14,19 +14,26 @@ class DiaryEntryController < ApplicationController
       end
     end
   end
+
+  def comment
+    @entry = DiaryEntry.find(params[:id])
+    @diary_comment = @entry.diary_comments.build(params[:diary_comment])
+    @diary_comment.user = @user
+    if @diary_comment.save
+      redirect_to :controller => 'diary_entry', :action => 'view', :display_name => @entry.user.display_name, :id => @entry.id
+    else
+      render :action => 'view'
+    end
+  end
   
   def list
     if params[:display_name]
       @this_user = User.find_by_display_name(params[:display_name])
       @title = @this_user.display_name + "'s diary"
-      if params[:id]
-        @entries=DiaryEntry.find(:all, :conditions => ['user_id = ? AND id = ?', @this_user.id, params[:id]])
-      else
-        @entries=DiaryEntry.find(:all, :conditions => ['user_id = ?', @this_user.id], :order => 'created_at DESC')
-      end
+      @entries = DiaryEntry.find(:all, :conditions => ['user_id = ?', @this_user.id], :order => 'created_at DESC')
     else
-      @title = 'recent diary entries'
-      @entries=DiaryEntry.find(:all, :order => 'created_at DESC', :limit => 20)
+      @title = "Users' diaries"
+      @entries = DiaryEntry.find(:all, :order => 'created_at DESC', :limit => 20)
     end
   end
 
@@ -46,4 +53,9 @@ class DiaryEntryController < ApplicationController
 
     render :content_type => Mime::RSS
   end
+
+  def view
+    user = User.find_by_display_name(params[:display_name])
+    @entry = DiaryEntry.find(:first, :conditions => ['user_id = ? AND id = ?', user.id, params[:id]])
+  end
 end

app/models/diary_comment.rb

@@ -0,0 +1,7 @@
+class DiaryComment < ActiveRecord::Base
+  belongs_to :user
+  belongs_to :diary_entry
+
+  validates_presence_of :body
+  validates_associated :diary_entry
+end

app/models/diary_entry.rb

@@ -1,5 +1,6 @@
 class DiaryEntry < ActiveRecord::Base
   belongs_to :user
+  has_many :diary_comments, :order => "id"
 
   validates_presence_of :title, :body
   validates_numericality_of :latitude, :allow_nil => true

app/views/diary_entry/_diary_comment.rhtml

@@ -0,0 +1,3 @@
+<h4>Comment from <%= link_to diary_comment.user.display_name, :controller => 'user', :action => 'view', :display_name => diary_comment.user.display_name %>  at <%= diary_comment.created_at %></h4>
+<%= htmlize(diary_comment.body) %>
+<hr />

app/views/diary_entry/_diary_entry.rhtml

@@ -1,8 +1,13 @@
-<b><%= h(diary_entry.title) %></b><br />
+<b><%= link_to h(diary_entry.title), :action => 'view', :display_name => diary_entry.user.display_name, :id => diary_entry.id %></b><br />
 <%= htmlize(diary_entry.body) %>
 <% if diary_entry.latitude and diary_entry.longitude %>
 Coordinates: <div class="geo" style="display: inline"><span class="latitude"><%= diary_entry.latitude %></span>; <span class="longitude"><%= diary_entry.longitude %></span></div> (<%=link_to 'map', :controller => 'site', :action => 'index', :lat => diary_entry.latitude, :lon => diary_entry.longitude, :zoom => 14 %> / <%=link_to 'edit', :controller => 'site', :action => 'edit', :lat => diary_entry.latitude, :lon => diary_entry.longitude, :zoom => 14 %>)<br/>
 <% end %>
 Posted by <b><%= link_to diary_entry.user.display_name, :controller => 'user', :action => 'view', :display_name => diary_entry.user.display_name %></b> at <%= diary_entry.created_at %><br />
+<% if params[:action] == 'list' %>
+<%= link_to 'Comment on this entry', :action => 'view', :display_name => diary_entry.user.display_name, :id => diary_entry.id, :anchor => 'comment' %>
+|
+<%= link_to 'Reply to this entry', :controller => 'message', :action => 'new', :user_id => diary_entry.user.id, :title => "Re: #{diary_entry.title}" %>
+<% end %>
 <br />
 <hr />

app/views/diary_entry/list.rhtml

@@ -1,10 +1,9 @@
+<h2><%= @title %></h2>
 <% if @this_user %>
-  <h2><%= @this_user.display_name %>'s diary</h2>
   <% if @user == @this_user %>
     <%= link_to 'New diary post', :controller => 'diary_entry', :action => 'new', :display_name => @user.display_name %>
   <% end %>
 <% else %>
-  <h2>Users' diaries</h2>
   <% if @user %>
     <%= link_to 'New diary post', :controller => 'diary_entry', :action => 'new', :display_name => @user.display_name %>
   <% end %>
@@ -12,7 +11,7 @@
 
 <h3>Recent diary entries:</h3>
 
-<%= render :partial => 'diary_entry/diary_entry', :collection => @entries %>
+<%= render :partial => 'diary_entry', :collection => @entries %>
 
 <%= link_to(image_tag("RSS.gif", :size => "16x16", :border => 0), :action => 'rss') %>
 <%= auto_discovery_link_tag(:atom, :action => 'rss') %>

app/views/diary_entry/view.rhtml

@@ -0,0 +1,22 @@
+<h2><%= @entry.user.display_name %>'s diary</h2>
+
+<%= render :partial => 'diary_entry', :object => @entry %>
+
+<%= render :partial => 'diary_comment', :collection => @entry.diary_comments %>
+
+<% if @user %>
+
+<h4 id="comment">Leave a comment</h4>
+<%= error_messages_for 'diary_comment' %>
+<% form_for :diary_comment, @diary_comment, :url => { :action => 'comment' } do |f| %>
+<%= f.text_area :body, :cols => 80, :rows => 5 %>
+<br />
+<br />
+<%= submit_tag 'Save' %>
+<% end %>
+
+<% else %>
+
+<h4 id="comment"><%= link_to "Login", :controller => 'user', :action => 'login', :referer => request.request_uri %> to leave a comment</h4>
+
+<% end %>

config/routes.rb

@@ -97,7 +97,8 @@ ActionController::Routing::Routes.draw do |map|
   map.connect '/user/:display_name/make_friend', :controller => 'user', :action => 'make_friend'
   map.connect '/user/:display_name/remove_friend', :controller => 'user', :action => 'remove_friend'
   map.connect '/user/:display_name/diary', :controller => 'diary_entry', :action => 'list'
-  map.connect '/user/:display_name/diary/:id', :controller => 'diary_entry', :action => 'list', :id => /\d+/
+  map.connect '/user/:display_name/diary/:id', :controller => 'diary_entry', :action => 'view', :id => /\d+/
+  map.connect '/user/:display_name/diary/:id/newcomment', :controller => 'diary_entry', :action => 'comment', :id => /\d+/
   map.connect '/user/:display_name/diary/rss', :controller => 'diary_entry', :action => 'rss'
   map.connect '/user/:display_name/diary/newpost', :controller => 'diary_entry', :action => 'new'
   map.connect '/user/:display_name/account', :controller => 'user', :action => 'account'

db/migrate/010_diary_comments.rb

@@ -0,0 +1,21 @@
+class DiaryComments < ActiveRecord::Migration
+  def self.up
+    create_table "diary_comments", myisam_table do |t|
+      t.column "id",             :bigint,   :limit => 20, :null => false
+      t.column "diary_entry_id", :bigint,   :limit => 20, :null => false
+      t.column "user_id",        :bigint,   :limit => 20, :null => false
+      t.column "body",           :text,                   :null => false
+      t.column "created_at",     :datetime,               :null => false
+      t.column "updated_at",     :datetime,               :null => false
+    end
+
+    add_primary_key "diary_comments", ["id"]
+    add_index "diary_comments", ["diary_entry_id", "id"], :name => "diary_comments_entry_id_idx", :unique => true
+
+    change_column "diary_comments", "id", :bigint, :limit => 20, :null => false, :options => "AUTO_INCREMENT"
+  end
+
+  def self.down
+    drop_table "diary_comments"
+  end
+end