Change the way nuked users' posts are handled. Allow null in the user_id column of posts. Show these posts in the posts stream.

app/assets/javascripts/discourse/models/post.js

@@ -30,6 +30,7 @@ Discourse.Post = Discourse.Model.extend({
   deletedViaTopic: Em.computed.and('firstPost', 'topic.deleted_at'),
   deleted: Em.computed.or('deleted_at', 'deletedViaTopic'),
   notDeleted: Em.computed.not('deleted'),
+  userDeleted: Em.computed.empty('user_id'),
 
   postDeletedBy: function() {
     if (this.get('firstPost')) { return this.get('topic.deleted_by'); }

app/assets/javascripts/discourse/templates/post.js.handlebars

@@ -17,11 +17,18 @@
     {{/if}}
 
     <div class='topic-meta-data span2'>
+      {{#unless userDeleted}}
         <div {{bindAttr class=":contents byTopicCreator:topic-creator"}}>
           <a href='{{unbound usernameUrl}}'>{{avatar this imageSize="large"}}</a>
           <h3 {{bindAttr class="staff new_user"}}><a href='{{unbound usernameUrl}}'>{{breakUp username}}</a></h3>
           {{#if user_title}}<div class="user-title">{{user_title}}</div>{{/if}}
         </div>
+      {{else}}
+        <div class="contents">
+          <i class="icon icon-trash deleted-user-avatar"></i>
+          <h3 class="deleted-username">{{i18n user.deleted}}</h3>
+        </div>
+      {{/unless}}
     </div>
 
     <div class='topic-body span14'>

app/assets/stylesheets/application/topic-post.css.scss

@@ -355,6 +355,10 @@
         font-size: 13px;
         line-height: 18px;
       }
+      .deleted-user-avatar {
+        font-size: 36px;
+        line-height: 36px;
+      }
 
       .staff a {
         @include border-radius-all(3px);

app/models/post.rb

@@ -45,7 +45,6 @@ class Post < ActiveRecord::Base
   scope :public_posts, -> { joins(:topic).where('topics.archetype <> ?', Archetype.private_message) }
   scope :private_posts, -> { joins(:topic).where('topics.archetype = ?', Archetype.private_message) }
   scope :with_topic_subtype, ->(subtype) { joins(:topic).where('topics.subtype = ?', subtype) }
-  scope :without_nuked_users, -> { where(nuked_user: false) }
 
   def self.hidden_reasons
     @hidden_reasons ||= Enum.new(:flag_threshold_reached, :flag_threshold_reached_again, :new_user_spam_threshold_reached)
@@ -383,7 +382,7 @@ end
 # Table name: posts
 #
 #  id                      :integer          not null, primary key
-#  user_id                 :integer          not null
+#  user_id                 :integer
 #  topic_id                :integer          not null
 #  post_number             :integer          not null
 #  raw                     :text             not null
@@ -419,7 +418,6 @@ end
 #  notify_user_count       :integer          default(0), not null
 #  like_score              :integer          default(0), not null
 #  deleted_by_id           :integer
-#  nuked_user              :boolean          default(FALSE)
 #
 # Indexes
 #

app/models/user.rb

@@ -13,22 +13,22 @@ class User < ActiveRecord::Base
   include Roleable
 
   has_many :posts
-  has_many :notifications
+  has_many :notifications, dependent: :destroy
-  has_many :topic_users
+  has_many :topic_users, dependent: :destroy
   has_many :topics
   has_many :user_open_ids, dependent: :destroy
-  has_many :user_actions
+  has_many :user_actions, dependent: :destroy
-  has_many :post_actions
+  has_many :post_actions, dependent: :destroy
-  has_many :email_logs
+  has_many :email_logs, dependent: :destroy
   has_many :post_timings
-  has_many :topic_allowed_users
+  has_many :topic_allowed_users, dependent: :destroy
   has_many :topics_allowed, through: :topic_allowed_users, source: :topic
-  has_many :email_tokens
+  has_many :email_tokens, dependent: :destroy
   has_many :views
-  has_many :user_visits
+  has_many :user_visits, dependent: :destroy
-  has_many :invites
+  has_many :invites, dependent: :destroy
-  has_many :topic_links
+  has_many :topic_links, dependent: :destroy
-  has_many :uploads
+  has_many :uploads, dependent: :destroy
 
   has_one :facebook_user_info, dependent: :destroy
   has_one :twitter_user_info, dependent: :destroy
@@ -37,11 +37,11 @@ class User < ActiveRecord::Base
   has_one :oauth2_user_info, dependent: :destroy
   belongs_to :approved_by, class_name: 'User'
 
-  has_many :group_users
+  has_many :group_users, dependent: :destroy
   has_many :groups, through: :group_users
   has_many :secure_categories, through: :groups, source: :categories
 
-  has_one :user_search_data
+  has_one :user_search_data, dependent: :destroy
 
   belongs_to :uploaded_avatar, class_name: 'Upload', dependent: :destroy
 
@@ -61,6 +61,12 @@ class User < ActiveRecord::Base
 
   after_create :create_email_token
 
+  before_destroy do
+    # These tables don't have primary keys, so destroying them with activerecord is tricky:
+    PostTiming.delete_all(user_id: self.id)
+    View.delete_all(user_id: self.id)
+  end
+
   # Whether we need to be sending a system message after creation
   attr_accessor :send_welcome_message
 

app/serializers/basic_post_serializer.rb

@@ -8,15 +8,15 @@ class BasicPostSerializer < ApplicationSerializer
              :cooked
 
   def name
-    object.user.name
+    object.user.try(:name)
   end
 
   def username
-    object.user.username
+    object.user.try(:username)
   end
 
   def avatar_template
-    object.user.avatar_template
+    object.user.try(:avatar_template)
   end
 
   def cooked

app/serializers/post_serializer.rb

@@ -46,11 +46,11 @@ class PostSerializer < BasicPostSerializer
 
 
   def moderator?
-    object.user.moderator?
+    object.user.try(:moderator?) || false
   end
 
   def staff?
-    object.user.staff?
+    object.user.try(:staff?) || false
   end
 
   def yours
@@ -70,7 +70,7 @@ class PostSerializer < BasicPostSerializer
   end
 
   def display_username
-    object.user.name
+    object.user.try(:name)
   end
 
   def link_counts
@@ -101,11 +101,11 @@ class PostSerializer < BasicPostSerializer
   end
 
   def user_title
-    object.user.title
+    object.user.try(:title)
   end
 
   def trust_level
-    object.user.trust_level
+    object.user.try(:trust_level)
   end
 
   def reply_to_user

app/serializers/post_stream_serializer_mixin.rb

@@ -15,7 +15,6 @@ module PostStreamSerializerMixin
     @highest_number_in_posts = 0
     if object.posts.present?
       object.posts.each_with_index do |p, idx|
-        if p.user
         @highest_number_in_posts = p.post_number if p.post_number > @highest_number_in_posts
         ps = PostSerializer.new(p, scope: scope, root: false)
         ps.topic_slug = object.topic.slug
@@ -25,7 +24,6 @@ module PostStreamSerializerMixin
         @posts << ps.as_json
       end
     end
-    end
     @posts
   end
 

config/locales/client.en.yml

@@ -200,6 +200,7 @@ en:
       change: "change"
       moderator: "{{user}} is a moderator"
       admin: "{{user}} is an admin"
+      deleted: "User Was Deleted"
 
       messages:
         all: "All"

db/migrate/20130903154323_allow_null_user_id_on_posts.rb

@@ -0,0 +1,12 @@
+class AllowNullUserIdOnPosts < ActiveRecord::Migration
+  def up
+    change_column :posts, :user_id, :integer, null: true
+    execute "UPDATE posts SET user_id = NULL WHERE nuked_user = true"
+    remove_column :posts, :nuked_user
+  end
+
+  def down
+    add_column    :posts, :nuked_user, :boolean, default: false
+    change_column :posts, :user_id, :integer, null: false
+  end
+end

lib/topic_view.rb

@@ -89,7 +89,7 @@ class TopicView
 
   def image_url
     return nil if desired_post.blank?
-    desired_post.user.small_avatar_url
+    desired_post.user.try(:small_avatar_url)
   end
 
   def filter_posts(opts = {})
@@ -256,7 +256,7 @@ class TopicView
 
   def setup_filtered_posts
     @filtered_posts = @topic.posts
-    @filtered_posts = @filtered_posts.with_deleted.without_nuked_users if @user.try(:staff?)
+    @filtered_posts = @filtered_posts.with_deleted if @user.try(:staff?)
     @filtered_posts = @filtered_posts.best_of if @filter == 'best_of'
     @filtered_posts = @filtered_posts.where('posts.post_type <> ?', Post.types[:moderator_action]) if @best.present?
     return unless @username_filters.present?

lib/user_destroyer.rb

@@ -34,7 +34,7 @@ class UserDestroyer
             b = ScreenedEmail.block(u.email, ip_address: u.ip_address)
             b.record_match! if b
           end
-          Post.with_deleted.where(user_id: user.id).update_all("nuked_user = true")
+          Post.with_deleted.where(user_id: user.id).update_all("user_id = NULL")
           StaffActionLogger.new(@staff).log_user_deletion(user, opts.slice(:context))
           DiscourseHub.unregister_nickname(user.username) if SiteSetting.call_discourse_hub?
           MessageBus.publish "/file-change", ["refresh"], user_ids: [user.id]

lib/validators/post_validator.rb

@@ -13,9 +13,12 @@ class Validators::PostValidator < ActiveModel::Validator
   end
 
   def presence(post)
-    [:raw,:user_id,:topic_id].each do |attr_name|
+    [:raw,:topic_id].each do |attr_name|
        post.errors.add(attr_name, :blank, options) if post.send(attr_name).blank?
     end
+    if post.new_record? and post.user_id.nil?
+      post.errors.add(:user_id, :blank, options)
+    end
   end
 
   def stripped_length(post)

spec/components/topic_view_spec.rb

@@ -216,6 +216,7 @@ describe TopicView do
     # Create the posts in a different order than the sort_order
     let!(:p5) { Fabricate(:post, topic: topic, user: coding_horror)}
     let!(:p2) { Fabricate(:post, topic: topic, user: coding_horror)}
+    let!(:p6) { Fabricate(:post, topic: topic, user: Fabricate(:user), deleted_at: Time.now)}
     let!(:p4) { Fabricate(:post, topic: topic, user: coding_horror, deleted_at: Time.now)}
     let!(:p1) { Fabricate(:post, topic: topic, user: first_poster)}
     let!(:p3) { Fabricate(:post, topic: topic, user: first_poster)}
@@ -224,10 +225,12 @@ describe TopicView do
       SiteSetting.stubs(:posts_per_page).returns(3)
 
       # Update them to the sort order we're checking for
-      [p1, p2, p3, p4, p5].each_with_index do |p, idx|
+      [p1, p2, p3, p4, p5, p6].each_with_index do |p, idx|
         p.sort_order = idx + 1
         p.save
       end
+      p6.user_id = nil # user got nuked
+      p6.save!
     end
 
     describe '#filter_posts_paged' do
@@ -236,6 +239,7 @@ describe TopicView do
       it 'returns correct posts for all pages' do
         topic_view.filter_posts_paged(1).should == [p1, p2]
         topic_view.filter_posts_paged(2).should == [p3, p5]
+        topic_view.filter_posts_paged(3).should == []
         topic_view.filter_posts_paged(100).should == []
       end
     end
@@ -271,6 +275,13 @@ describe TopicView do
         near_view.posts.should == [p2, p3, p4]
       end
 
+      it "returns deleted posts by nuked users to an admin" do
+        coding_horror.admin = true
+        near_view = topic_view_near(p5)
+        near_view.desired_post.should == p5
+        near_view.posts.should == [p4, p5, p6]
+      end
+
       context "when 'posts per page' exceeds the number of posts" do
         before { SiteSetting.stubs(:posts_per_page).returns(100) }
 
@@ -278,6 +289,12 @@ describe TopicView do
           near_view = topic_view_near(p5)
           near_view.posts.should == [p1, p2, p3, p5]
         end
+
+        it 'returns deleted posts to admins' do
+          coding_horror.admin = true
+          near_view = topic_view_near(p5)
+          near_view.posts.should == [p1, p2, p3, p4, p5, p6]
+        end
       end
     end
   end

spec/components/user_destroyer_spec.rb

@@ -121,25 +121,26 @@ describe UserDestroyer do
         it "deletes the posts" do
           destroy
           post.reload.deleted_at.should_not be_nil
-          post.nuked_user.should be_true
+          post.user_id.should be_nil
         end
       end
     end
 
+    context 'user has deleted posts' do
+      let!(:deleted_post) { Fabricate(:post, user: @user, deleted_at: 1.hour.ago) }
+      it "should mark the user's deleted posts as belonging to a nuked user" do
+        expect { UserDestroyer.new(@admin).destroy(@user) }.to change { User.count }.by(-1)
+        deleted_post.reload.user_id.should be_nil
+      end
+    end
+
     context 'user has no posts' do
       context 'and destroy succeeds' do
-
         let(:destroy_opts) { {} }
         subject(:destroy) { UserDestroyer.new(@admin).destroy(@user) }
 
         include_examples "successfully destroy a user"
         include_examples "email block list"
-
-        it "should mark the user's deleted posts as belonging to a nuked user" do
-          post = Fabricate(:post, user: @user, deleted_at: 1.hour.ago)
-          expect { destroy }.to change { User.count }.by(-1)
-          post.reload.nuked_user.should be_true
-        end
       end
 
       context 'and destroy fails' do

spec/serializers/post_serializer_spec.rb

@@ -0,0 +1,25 @@
+require 'spec_helper'
+
+describe PostSerializer do
+
+  context "a post by a nuked user" do
+    let!(:post) { Fabricate(:post, user: Fabricate(:user), deleted_at: Time.zone.now) }
+
+    before do
+      post.user_id = nil
+      post.save!
+    end
+
+    subject { PostSerializer.new(post, scope: Guardian.new(Fabricate(:admin)), root: false).as_json }
+
+    it "serializes correctly" do
+      [:name, :username, :display_username, :avatar_template].each do |attr|
+        subject[attr].should be_nil
+      end
+      [:moderator?, :staff?, :yours, :user_title, :trust_level].each do |attr|
+        subject[attr].should be_false
+      end
+    end
+  end
+
+end