You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 20161121033801_add_tax_declarations.rb
    path of file: ./repos/ekylibre/db/migrate
    
    the code of the file until where you have to start completion: class AddTaxDeclarations < ActiveRecord::Migration[4.2]
  def change
    create_table :tax_declarations do |t|
      t.references :financial_year, null: false, index: true
      t.references :journal_entry, index: true
      t.datetime :ac
    
  def change
    create_table :tax_declarations do |t|
      t.references :financial_year, null: false, index: true
      t.references :journal_entry, index: true
      t.datetime :accounted_at
      t.references :responsible, index: true
      t.string :mode, null: false
      t.text :description
      t.date :started_on, null: false
      t.date :stopped_on, null: false
      t.string :currency, null: false
      t.string :number
      t.string :reference_number
      t.string :state
      t.date :invoiced_on
      t.stamps
    end

    create_table :tax_declaration_items do |t|
      t.references :tax_declaration, null: false, index: true
      t.references :tax, null: false, index: true
      t.string :currency, null: false
      t.decimal :collected_tax_amount, precision: 19, scale: 4, null: false, default: 0.0
      t.decimal :deductible_tax_amount, precision: 19, scale: 4, null: false, default: 0.0
      t.decimal :deductible_pretax_amount, precision: 19, scale: 4, null: false, default: 0.0
      t.decimal :collected_pretax_amount, precision: 19, scale: 4, null: false, default: 0.0
      t.decimal :fixed_asset_deductible_pretax_amount, precision: 19, scale: 4, null: false, default: 0.0
      t.decimal :fixed_asset_deductible_tax_amount, precision: 19, scale: 4, null: false, default: 0.0
      t.decimal :balance_pretax_amount, precision: 19, scale: 4, null: false, default: 0.0
      t.decimal :balance_tax_amount, precision: 19, scale: 4, null: false, default: 0.0
      t.stamps
    end

    add_column :financial_years, :tax_declaration_frequency, :string
    add_column :financial_years, :tax_declaration_mode, :string
    reversible do |d|
      d.up do
        execute "UPDATE financial_years SET tax_declaration_mode = 'payment'"
      end
    end
    change_column_null :financial_years, :tax_declaration_mode, false

    add_reference :journal_entry_items, :tax_declaration_item, index: true

    add_column :journals, :used_for_tax_declarations, :boolean, null: false, default: false
  end