method

reset_column_information

v3.2.3 - Show latest stable - 0 notes - Class: ClassMethods

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What's this?

reset_column_information() public

Resets all the cached information about columns, which will cause them to be reloaded on the next request.

The most common usage pattern for this method is probably in a migration, when just after creating a table you want to populate it with some default values, eg:

class CreateJobLevels < ActiveRecord::Migration
  def up
    create_table :job_levels do |t|
      t.integer :id
      t.string :name

      t.timestamps
    end

    JobLevel.reset_column_information
    %w{assistant executive manager director}.each do |type|
      JobLevel.create(:name => type)
    end
  end

  def down
    drop_table :job_levels
  end
end

Show source

# File activerecord/lib/active_record/model_schema.rb, line 297
      def reset_column_information
        connection.clear_cache!
        undefine_attribute_methods
        connection.schema_cache.clear_table_cache!(table_name) if table_exists?

        @column_names = @content_columns = @column_defaults = @columns = @columns_hash = nil
        @dynamic_methods_hash = @inheritance_column = nil
        @arel_engine = @relation = nil
      end

reset_column_information

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