Adding BillItem to database

app/models/bill_item.rb

@@ -0,0 +1,15 @@
+class BillItem < ActiveRecord::Base
+  belongs_to :enterprise
+  belongs_to :owner, class_name: 'Spree::User', foreign_key: :owner_id
+
+  def bill
+    # Will make this more sophisicated in the future in that it will use global config variables to calculate
+    return 0 if trial?
+    if ['own', 'any'].include? sells
+      bill = (turnover * 0.02)
+      bill > 50 ? 50 : bill
+    else
+      0
+    end
+  end
+end

db/migrate/20150619100137_create_bill_items.rb

@@ -0,0 +1,15 @@
+class CreateBillItems < ActiveRecord::Migration
+  def change
+    create_table :bill_items do |t|
+      t.references :enterprise, nil: false
+      t.references :owner, nil: false
+      t.datetime :begins_at, default: nil
+      t.datetime :ends_at, default: nil
+      t.string :sells, default: nil
+      t.boolean :trial, default: false
+      t.decimal :turnover, default: 0.0
+      t.foreign_key :enterprises
+      t.foreign_key :spree_users, column: :owner_id
+    end
+  end
+end

db/schema.rb

@@ -24,6 +24,16 @@ ActiveRecord::Schema.define(:version => 20150730160010) do
   add_index "adjustment_metadata", ["adjustment_id"], :name => "index_adjustment_metadata_on_adjustment_id"
   add_index "adjustment_metadata", ["enterprise_id"], :name => "index_adjustment_metadata_on_enterprise_id"
 
+  create_table "bill_items", :force => true do |t|
+    t.integer  "enterprise_id"
+    t.integer  "owner_id"
+    t.datetime "begins_at"
+    t.datetime "ends_at"
+    t.string   "sells"
+    t.boolean  "trial",         :default => false
+    t.decimal  "turnover",      :default => 0.0
+  end
+
   create_table "carts", :force => true do |t|
     t.integer "user_id"
   end
@@ -1140,6 +1150,9 @@ ActiveRecord::Schema.define(:version => 20150730160010) do
   add_foreign_key "adjustment_metadata", "enterprises", name: "adjustment_metadata_enterprise_id_fk"
   add_foreign_key "adjustment_metadata", "spree_adjustments", name: "adjustment_metadata_adjustment_id_fk", column: "adjustment_id", dependent: :delete
 
+  add_foreign_key "bill_items", "enterprises", name: "bill_items_enterprise_id_fk"
+  add_foreign_key "bill_items", "spree_users", name: "bill_items_owner_id_fk", column: "owner_id"
+
   add_foreign_key "carts", "spree_users", name: "carts_user_id_fk", column: "user_id"
 
   add_foreign_key "cms_blocks", "cms_pages", name: "cms_blocks_page_id_fk", column: "page_id"