method

accessed_fields

v5.1.7 - Show latest stable - 0 notes - Class: ActiveRecord::AttributeMethods

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What's this?

accessed_fields() public

Returns the name of all database fields which have been read from this model. This can be useful in development mode to determine which fields need to be selected. For performance critical pages, selecting only the required fields can be an easy performance win (assuming you aren’t using all of the fields on the model).

For example:

class PostsController < ActionController::Base
  after_action :print_accessed_fields, only: :index

  def index
    @posts = Post.all
  end

  private

  def print_accessed_fields
    p @posts.first.accessed_fields
  end
end

Which allows you to quickly change your code to:

class PostsController < ActionController::Base
  def index
    @posts = Post.select(:id, :title, :author_id, :updated_at)
  end
end

Show source

# File activerecord/lib/active_record/attribute_methods.rb, line 391
    def accessed_fields
      @attributes.accessed
    end

accessed_fields

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