add Tag.active scope to deprecate tags without removing them

app/controllers/filters_controller.rb

@@ -5,7 +5,7 @@ class FiltersController < ApplicationController
     @cur_url = "/filters"
     @title = "Filtered Tags"
 
-    @tags = Tag.all_with_story_counts_for(@user)
+    @tags = Tag.active.all_with_story_counts_for(@user)
 
     if @user
       @filtered_tags = @user.tag_filter_tags.to_a
@@ -16,7 +16,8 @@ class FiltersController < ApplicationController
 
   def update
     tags_param = params[:tags]
-    new_tags = tags_param.blank? ? [] : Tag.where(:tag => tags_param).to_a
+    new_tags = tags_param.blank? ? [] :
+      Tag.active.where(:tag => tags_param).to_a
     new_tags.keep_if {|t| t.valid_for? @user }
 
     if @user

app/models/story.rb

@@ -149,6 +149,9 @@ class Story < ActiveRecord::Base
       if !t.tag.valid_for?(self.user)
         raise "#{self.user.username} does not have permission to use " <<
           "privileged tag #{t.tag.tag}"
+      elsif t.tag.inactive? && !t.new_record?
+        # stories can have inactive tags as long as they existed before
+        raise "#{self.user.username} cannot add inactive tag #{t.tag.tag}"
       end
     end
 
@@ -336,7 +339,7 @@ class Story < ActiveRecord::Base
 
     new_tag_names_a.each do |tag_name|
       if tag_name.to_s != "" && !self.tags.exists?(:tag => tag_name)
-        if t = Tag.where(:tag => tag_name).first
+        if t = Tag.active.where(:tag => tag_name).first
           # we can't lookup whether the user is allowed to use this tag yet
           # because we aren't assured to have a user_id by now; we'll do it in
           # the validation with check_tags

app/models/tag.rb

@@ -10,6 +10,8 @@ class Tag < ActiveRecord::Base
     user && user.is_moderator?? all : where(:privileged => false)
   end
 
+  scope :active, -> { where(:inactive => false) }
+
   def to_param
     self.tag
   end
@@ -17,7 +19,7 @@ class Tag < ActiveRecord::Base
   def self.all_with_filtered_counts_for(user)
     counts = TagFilter.group(:tag_id).count
 
-    Tag.order(:tag).accessible_to(user).map{|t|
+    Tag.active.order(:tag).accessible_to(user).map{|t|
       t.filtered_count = counts[t.id].to_i
       t
     }
@@ -26,7 +28,7 @@ class Tag < ActiveRecord::Base
   def self.all_with_story_counts_for(user)
     counts = Tagging.group(:tag_id).count
 
-    Tag.order(:tag).accessible_to(user).map{|t|
+    Tag.active.order(:tag).accessible_to(user).map{|t|
       t.stories_count = counts[t.id].to_i
       t
     } 

app/models/user.rb

@@ -191,7 +191,7 @@ class User < ActiveRecord::Base
   end
 
   def most_common_story_tag
-    Tag.joins(
+    Tag.active.joins(
       :stories
     ).where(
       :stories => { :user_id => self.id }

db/migrate/20140221164400_inactive_tags.rb

@@ -0,0 +1,5 @@
+class InactiveTags < ActiveRecord::Migration
+  def change
+    add_column :tags, :inactive, :boolean, :default => false
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20140219183804) do
+ActiveRecord::Schema.define(version: 20140221164400) do
 
   create_table "comments", force: true do |t|
     t.datetime "created_at",                                                                    null: false
@@ -107,6 +107,7 @@ ActiveRecord::Schema.define(version: 20140219183804) do
 
   add_index "stories", ["hotness"], name: "hotness_idx", using: :btree
   add_index "stories", ["is_expired", "is_moderated"], name: "is_idxes", using: :btree
+  add_index "stories", ["short_id"], name: "short_id", unique: true, using: :btree
   add_index "stories", ["url"], name: "url", length: {"url"=>191}, using: :btree
 
   create_table "tag_filters", force: true do |t|
@@ -130,6 +131,7 @@ ActiveRecord::Schema.define(version: 20140219183804) do
     t.string  "description", limit: 100
     t.boolean "privileged",              default: false
     t.boolean "is_media",                default: false
+    t.boolean "inactive",                default: false
   end
 
   add_index "tags", ["tag"], name: "tag", unique: true, using: :btree