# frozen_string_literal: true

class <%= @migration_class_name %> < ActiveRecord::Migration<%= ActiveRecord::VERSION::MAJOR < 5 ? '' : '[5.0]' %>
  def up
    execute <<-SQL
    CREATE OR REPLACE VIEW <%= view_name %> AS

    SELECT UNNEST
      ( <%= source_column_name %> ) AS name,
      COUNT ( * ) AS taggings_count
    FROM
      <%= source_table_name %>
    GROUP BY
      name;
    SQL
  end

  def down
    execute <<-SQL
      DROP VIEW <%= view_name %>;
    SQL
  end
end