ruby on rails - Datatables + JSON + best_in_place -

i can not add gem best_in_place table.

class_datatable.rb:

  def data     class.map |record|       [         best_in_place(record, :name),         best_in_place(record, :short_name)       ]     end   end 

there error: nomethoderror (undefined method `best_in_place' classdatatable:0xa9283a44)

my gem file: source 'https://rubygems.org'

# bundle edge rails instead: gem 'rails', github: 'rails/rails' gem 'rails', '4.2.4' # use sqlite3 database active record gem 'ruby-oci8' gem 'activerecord-oracle_enhanced-adapter' # use scss stylesheets gem 'sass-rails', '~> 5.0' # use uglifier compressor javascript assets gem 'uglifier', '>= 1.3.0' # use coffeescript .coffee assets , views gem 'coffee-rails', '~> 4.1.0' # see https://github.com/rails/execjs#readme more supported runtimes # gem 'therubyracer', platforms: :ruby  # use jquery javascript library gem 'jquery-rails' gem 'jquery-turbolinks' # turbolinks makes following links in web application faster. read more: https://github.com/rails/turbolinks gem 'turbolinks' # build json apis ease. read more: https://github.com/rails/jbuilder gem 'jbuilder', '~> 2.0' # bundle exec rake doc:rails generates api under doc/api. gem 'sdoc', '~> 0.4.0', group: :doc  # use activemodel has_secure_password # gem 'bcrypt', '~> 3.1.7'  # use unicorn app server # gem 'unicorn'  # use capistrano deployment # gem 'capistrano-rails', group: :development  #---------------------------------my gems-------------------------------------------------------- #twitter bootstrap gem "therubyracer" gem "less-rails" #sprockets (what rails 3.1 uses asset pipeline) supports less gem "twitter-bootstrap-rails" gem 'client_side_validations'  #datatables gem 'jquery-datatables-rails', '~> 1.12.2' gem 'font-awesome-rails'          # icons  gem 'foundation-rails'            # zurb foundation   #best in place gem 'best_in_place'  #russian langue gem 'russian', '~> 0.6.0'  #jquery ui gem 'jquery-ui-rails'  #paginate gem 'will_paginate'  #-----------------------------------end--------------------------------------------------------- group :development, :test   # call 'byebug' anywhere in code stop execution , debugger console   gem 'byebug' end  group :development   # access irb console on exception pages or using <%= console %> in views   gem 'web-console', '~> 2.0'    # spring speeds development keeping application running in background. read more: https://github.com/rails/spring   gem 'spring' end 

bundle install done!

if on page:

<% class.all.each |record| %>   <%= best_in_place(record, :name) %> <% end %> 

that works. however, method not work "def data"

understood! necessary add delegate best_in_place section @ beginning of file class_datatable.rb