db/migrate/013_create_wk_resident_management.rb
class CreateWkResidentManagement  < ActiveRecord::Migration[4.2]

	def change
		
		create_table :wk_spent_fors do |t|
			t.references :spent_for, polymorphic: true, index: true
			t.references :spent, polymorphic: true, index: true
			t.datetime :spent_on_time
			t.references :invoice_item, :class => "wk_invoice_items", :null => true, :index => true
			t.timestamps null: false
		end
		
		create_table :wk_issues do |t|
			t.references :project, :null => false
			t.references :issue, :null => true
			t.column :currency, :string, :limit => 5, :default => '$'
			t.float :rate
			t.string :rate_per, :limit => 3
			t.timestamps null: false
		end
		
		create_table :wk_issue_assignees do |t|
			t.references :project, :null => false
			t.references :issue, :null => true
			t.references :user, :class => "User", :index => true
			t.timestamps null: false
		end
		
		add_reference :wk_accounts, :location, :class => "wk_locations", :null => true, :index => true
		
		add_reference :wk_crm_contacts, :location, :class => "wk_locations", :null => true, :index => true
		
		add_reference :wk_crm_contacts, :contact, :class => "wk_crm_contacts", :null => true, index: true
		
		add_reference :wk_crm_contacts, :relationship, :class => "wk_crm_enumerations", :null => true, :index => true
		
		reversible do |dir|
			dir.up do
				add_reference :wk_inventory_items, :from, :class => "wk_inventory_items", :index => true
				
				execute <<-SQL
				  UPDATE wk_inventory_items set from_id = parent_id;
				SQL
				
				execute <<-SQL
				  UPDATE wk_inventory_items set parent_id = null;
				SQL
			end

			dir.down do				
				execute <<-SQL
				  UPDATE wk_inventory_items set parent_id = from_id;
				SQL
				remove_reference :wk_inventory_items, :from
			end 
		end
	end
end