#1955: Migrate tags to belong to named users for enhanced privacy.

app/controllers/todos_controller.rb

@@ -106,7 +106,7 @@ class TodosController < ApplicationController
       if @todo.errors.empty?
         @todo.add_predecessor_list(p.predecessor_list)
         @saved = @todo.save
-        @todo.tag_with(tag_list) if @saved && tag_list.present?
+        @todo.tag_with(tag_list, current_user) if @saved && tag_list.present?
         @todo.block! if @todo.uncompleted_predecessors?
       else
         @saved = false
@@ -194,7 +194,7 @@ class TodosController < ApplicationController
           todo.block!
         end
 
-        todo.tag_with(tag_list) if @saved && tag_list.present?
+        todo.tag_with(tag_list, current_user) if @saved && tag_list.present?
 
         @todos << todo
         @not_done_todos << todo if p.new_context_created || p.new_project_created
@@ -712,9 +712,8 @@ class TodosController < ApplicationController
 
 
   def tags
-    # TODO: limit to current_user
-    tags_beginning = Tag.where(Tag.arel_table[:name].matches("#{params[:term]}%"))
-    tags_all = Tag.where(Tag.arel_table[:name].matches("%#{params[:term]}%"))
+    tags_beginning = current_user.tags.where(Tag.arel_table[:name].matches("#{params[:term]}%"))
+    tags_all = current_user.tags.where(Tag.arel_table[:name].matches("%#{params[:term]}%"))
     tags_all = tags_all - tags_beginning
 
     respond_to do |format|
@@ -1219,7 +1218,7 @@ end
 
   def update_tags
     if params[:tag_list]
-      @todo.tag_with(params[:tag_list])
+      @todo.tag_with(params[:tag_list], current_user)
       @todo.tags.reload #force a reload for proper rendering
     end
   end

app/models/recurring_todos/abstract_recurring_todos_builder.rb

@@ -129,7 +129,7 @@ module RecurringTodos
     end
 
     def save_tags
-      @recurring_todo.tag_with(@filterred_attributes[:tag_list]) if @filterred_attributes[:tag_list].present?
+      @recurring_todo.tag_with(@filterred_attributes[:tag_list], @user) if @filterred_attributes[:tag_list].present?
       @recurring_todo.reload
     end
 

app/models/tag.rb

@@ -3,13 +3,15 @@ class Tag < ApplicationRecord
   has_many :taggings
   has_many :taggable, :through => :taggings
 
+  belongs_to :user
+
   DELIMITER = ",".freeze # Controls how to split and join tagnames from strings. You may need to change the <tt>validates_format_of parameters</tt> if you change this.
   JOIN_DELIMITER = ", ".freeze
 
   # If database speed becomes an issue, you could remove these validations and
   # rescue the ActiveRecord database constraint errors instead.
   validates_presence_of :name
-  validates_uniqueness_of :name, :case_sensitive => false
+  validates_uniqueness_of :name, :scope => "user_id", :case_sensitive => false
 
   before_create :before_create
 

app/models/todo.rb

@@ -349,7 +349,7 @@ class Todo < ApplicationRecord
   def add_tags=(params)
     unless params[:tag].nil?
       tag_list = params[:tag].inject([]) { |list, value| list << value[:name] }
-      tag_with tag_list.join(", ")
+      tag_with tag_list.join(", "), user
     end
   end
 

app/models/user.rb

@@ -94,6 +94,7 @@ class User < ApplicationRecord
               end
            end
 
+  has_many :tags, dependent: :delete_all
   has_many :notes, -> { order "created_at DESC" }, dependent: :delete_all
   has_one :preference, dependent: :destroy
   has_many :attachments, through: :todos

app/services/todo_from_rich_message.rb

@@ -50,7 +50,7 @@ class TodoFromRichMessage
     todo.project_id  = project_id unless project_id.nil?
     todo.show_from   = show_from if show_from.is_a? Time
     todo.due         = due if due.is_a? Time
-    todo.tag_with tags unless tags.nil? || tags.empty?
+    todo.tag_with tags, @user unless tags.nil? || tags.empty?
     todo.starred     = star
     todo
   end

db/migrate/20190618202817_add_user_id_to_tag.rb

@@ -0,0 +1,72 @@
+class AddUserIdToTag < ActiveRecord::Migration[5.2]
+  def self.up
+	  add_column :tags, :user_id, :integer
+
+	  # Find uses of each tag for both Todos and RecurringTodos to
+	  # figure out which users use which tags.
+	  @tags = execute <<-EOQ
+		  SELECT t.id AS tid, tds.user_id AS todo_uid, rt.user_id AS rtodo_uid
+		  FROM tags t
+		  JOIN taggings tgs ON tgs.tag_id = t.id
+		  LEFT OUTER JOIN todos tds
+		   ON tgs.taggable_type = "Todo" AND tds.id = tgs.taggable_id
+		  LEFT OUTER JOIN recurring_todos rt
+		   ON tgs.taggable_type = "RecurringTodo" AND rt.id = tgs.taggable_id
+		  WHERE rt.id IS NOT NULL OR tds.id IS NOT NULL
+		  GROUP BY t.id, tds.user_id, rt.user_id
+	  EOQ
+
+	  # Map each tag to the users using it.
+	  @tag_users = {}
+	  @tags.each do |row|
+		  uid = (row[1] ? row[1] : row[2])
+		  if not @tag_users[row[0]]
+		    @tag_users[row[0]] = [uid]
+		  elsif not @tag_users[row[0]].include? uid
+		    @tag_users[row[0]] << uid
+		  end
+	  end
+
+	  # Go through the tags assigning users and duplicating as necessary.
+	  @tag_users.each do |tid, uids|
+		tag = Tag.find(tid)
+
+		# One of the users will get the original tag instance, but first
+		# duplicate their own copy to all the others.
+		extras = uids.length - 1
+		extras.times do |n|
+		  uid = uids[n+1]
+
+		  # Create a duplicate of the tag assigned to the user.
+		  new_tag = tag.dup
+		  new_tag.user_id = uid
+		  new_tag.save!
+
+		  # Move all the user's regular todos to the new tag.
+			connection.execute(<<-EOQ)
+			  UPDATE taggings ta
+			  JOIN todos t
+			   ON ta.taggable_type = "Todo" AND t.id = ta.taggable_id
+			  SET ta.tag_id = #{new_tag.id}
+			  WHERE t.user_id = #{uid}
+		  EOQ
+
+		  # Move all the user's recurring todos to the new tag.
+		  connection.execute(<<-EOQ)
+			  UPDATE taggings ta
+			  JOIN recurring_todos t
+			   ON ta.taggable_type = "RecurringTodo" AND t.id = ta.taggable_id
+			  SET ta.tag_id = #{new_tag.id}
+			  WHERE t.user_id = #{uid}
+		  EOQ
+		end
+
+		tag.user_id = uids[0]
+		tag.save!
+	  end
+  end
+  def self.down
+      remove_column :tags, :user_id
+  end
+end
+

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2016_01_31_233303) do
+ActiveRecord::Schema.define(version: 2019_06_18_202817) do
 
   create_table "attachments", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
     t.integer "todo_id"
@@ -159,6 +159,7 @@ ActiveRecord::Schema.define(version: 2016_01_31_233303) do
     t.string "name"
     t.datetime "created_at"
     t.datetime "updated_at"
+    t.integer "user_id"
     t.index ["name"], name: "index_tags_on_name"
   end
 

lib/is_taggable.rb

@@ -26,13 +26,13 @@ module IsTaggable
       end
 
       # Replace the existing tags on <tt>self</tt>. Accepts a string of tagnames, an array of tagnames, or an array of Tags.
-      def tag_with list
+      def tag_with(list, user)
         list = tag_cast_to_string(list)
 
         # Transactions may not be ideal for you here; be aware.
         Tag.transaction do
           current = tags.to_a.map(&:name)
-          _add_tags(list - current)
+          _add_tags(list - current, user)
           _remove_tags(current - list)
         end
 
@@ -46,12 +46,12 @@ module IsTaggable
       # Add tags to <tt>self</tt>. Accepts a string of tagnames, an array of tagnames, or an array of Tags.
       #
       # We need to avoid name conflicts with the built-in ActiveRecord association methods, thus the underscores.
-      def _add_tags incoming
+      def _add_tags(incoming, user)
         tag_cast_to_string(incoming).each do |tag_name|
           # added following check to prevent empty tags from being saved (which will fail)
           if tag_name.present?
             begin
-              tag = Tag.where(:name => tag_name).first_or_create
+              tag = user.tags.where(:name => tag_name).first_or_create
               raise Tag::Error, "tag could not be saved: #{tag_name}" if tag.new_record?
               tags << tag
             rescue ActiveRecord::StatementInvalid => e
@@ -94,8 +94,6 @@ module IsTaggable
           raise "Invalid object of class #{obj.class} as tagging method parameter"
         end
       end
-            
     end
   end
-  
 end