Add 'past owners' relation on items

app/controllers/items_controller.rb

@@ -18,6 +18,7 @@ def content_param_list
       # Relations
       original_ownerships_attributes:           [:id, :original_owner_id, :_destroy],
       current_ownerships_attributes:            [:id, :current_owner_id,  :_destroy],
+      past_ownerships_attributes:               [:id, :past_owner_id,     :_destroy],
       maker_relationships_attributes:           [:id, :maker_id,          :_destroy],
     ]
   end

app/models/content_groupers/past_ownership.rb

@@ -0,0 +1,8 @@
+# Defines a relation from an Item to a Character that previously owned it
+# and an inverse relationship from an Item to all Characters it has been owned by
+class PastOwnership < ActiveRecord::Base
+  belongs_to :user
+
+  belongs_to :item
+  belongs_to :past_owner, class_name: 'Character'
+end

app/models/item.rb

@@ -18,6 +18,7 @@ class Item < ActiveRecord::Base
 
   # Characters
   relates :original_owners,           with: :original_ownerships
+  relates :past_owners,               with: :past_ownerships
   relates :current_owners,            with: :current_ownerships
   relates :makers,                    with: :maker_relationships
 
@@ -43,7 +44,7 @@ def self.attribute_categories
       },
       history: {
         icon: 'book',
-        attributes: %w(original_owners current_owners makers year_made)
+        attributes: %w(original_owners past_owners current_owners makers year_made)
       },
       abilities: {
         icon: 'flash_on',

db/migrate/20161001232324_create_past_ownership.rb

@@ -0,0 +1,9 @@
+class CreatePastOwnership < ActiveRecord::Migration
+  def change
+    create_table :past_ownerships do |t|
+      t.integer :user_id
+      t.integer :item_id
+      t.integer :past_owner_id
+    end
+  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: 20160922204317) do
+ActiveRecord::Schema.define(version: 20161001232324) do
 
   create_table "archenemyships", force: :cascade do |t|
     t.integer  "user_id"
@@ -206,6 +206,12 @@
     t.datetime "updated_at",   null: false
   end
 
+  create_table "past_ownerships", force: :cascade do |t|
+    t.integer "user_id"
+    t.integer "item_id"
+    t.integer "past_owner_id"
+  end
+
   create_table "sessions", force: :cascade do |t|
     t.string   "username",   null: false
     t.string   "password",   null: false