Report a friendly error for attempts to reference a user that does

not exist. Closes #805.

app/controllers/diary_entry_controller.rb

@@ -30,11 +30,16 @@ class DiaryEntryController < ApplicationController
   def list
     if params[:display_name]
       @this_user = User.find_by_display_name(params[:display_name])
-      @title = @this_user.display_name + "'s diary"
-      @entry_pages, @entries = paginate(:diary_entries,
-                                        :conditions => ['user_id = ?', @this_user.id],
-                                        :order => 'created_at DESC',
-                                        :per_page => 20)
+      if @this_user
+        @title = @this_user.display_name + "'s diary"
+        @entry_pages, @entries = paginate(:diary_entries,
+                                          :conditions => ['user_id = ?', @this_user.id],
+                                          :order => 'created_at DESC',
+                                          :per_page => 20)
+      else
+        @not_found_user = params[:display_name]
+        render :action => 'no_such_user', :status => :not_found
+      end
     else
       @title = "Users' diaries"
       @entry_pages, @entries = paginate(:diary_entries,

app/controllers/user_controller.rb

@@ -179,7 +179,8 @@ class UserController < ApplicationController
     if @this_user
       @title = @this_user.display_name
     else
-      render :nothing => true, :status => :not_found
+      @not_found_user = params[:display_name]
+      render :action => 'no_such_user', :status => :not_found
     end
   end
 

app/views/diary_entry/no_such_user.rhtml

@@ -0,0 +1,2 @@
+<h2><%= h(@not_found_user) %></h2>
+<p>Sorry, there is no user with the name <%= @not_found_user -%>. Please check your spelling, or maybe the link you clicked is wrong.</p>

app/views/user/no_such_user.rhtml

@@ -0,0 +1,2 @@
+<h2><%= h(@not_found_user) %></h2>
+<p>Sorry, there is no user with the name <%= @not_found_user -%>. Please check your spelling, or maybe the link you clicked is wrong.</p>