Change schema version type of a Rails app to use the DB by a Phoenix app

20190525221739_change_version_type.rb

class ChangeVersionType < ActiveRecord::Migration[5.2]
  def up
    add_column :schema_migrations, :version2, :string

    versions = ActiveRecord::Base.connection.execute('SELECT * FROM schema_migrations').to_a
    versions.each do |version|
      ActiveRecord::Base.connection.execute("UPDATE schema_migrations SET version2 = '#{version['version']}' WHERE version = '#{version['version']}'")
    end

    remove_column :schema_migrations, :version, :string
    add_column :schema_migrations, :version, :bigint

    versions = ActiveRecord::Base.connection.execute('SELECT * FROM schema_migrations').to_a
    versions.each do |version|
      ActiveRecord::Base.connection.execute("UPDATE schema_migrations SET version = '#{version['version2']}' WHERE version2 = '#{version['version2']}'")
    end

    remove_column :schema_migrations, :version2
  end

  def down
    add_column :schema_migrations, :version2, :string

    versions = ActiveRecord::Base.connection.execute('SELECT * FROM schema_migrations').to_a
    versions.each do |version|
      ActiveRecord::Base.connection.execute("UPDATE schema_migrations SET version2 = '#{version['version']}' WHERE version = '#{version['version']}'")
    end

    remove_column :schema_migrations, :version, :bigint
    add_column :schema_migrations, :version, :string

    versions = ActiveRecord::Base.connection.execute('SELECT * FROM schema_migrations').to_a
    versions.each do |version|
      ActiveRecord::Base.connection.execute("UPDATE schema_migrations SET version = '#{version['version2']}' WHERE version2 = '#{version['version2']}'")
    end

    remove_column :schema_migrations, :version2, :string
  end
end