Upgradation rails 2 to rails 4 (Errors)

Some Errors are given below while migration of rails 2 to rails 4

• 'rake/rdoctask' is obsolete and no longer supported. Use 'rdoc/task' (available in RDoc 2.4.2+) instead.

require 'rake/rdoctask'

to

require 'rdoc/task'

• undefined method `attr_accessible' for

Add ‘gem 'protected_attributes' to Gemfile

• undefined method `link_to_function' for

Add patch in app/helpers/link_to_helper_function.rb

module LinkToFunctionHelper def link_to_function(name, *args, &block) html_options = args.extract_options!.symbolize_keys function = block_given? ? update_page(&block) : args[0] || '' onclick = "#{"#{html_options[:onclick]}; " if html_options[:onclick]}#{function}; return false;" href = html_options[:href] || '#' content_tag(:a, name, html_options.merge(:href => href, :onclick => onclick)) end end

• ActiveRecord::AssociationNotFoundError (Association named 'authorizations' was not found on User

Change in lib/authenticated_system.rb:108 to (if using restful-authentication)

User.includes(:roles => :authorizations).find_by_id(session[:user_id])

• undefined method `has_strings' for

Comment has_string wherever you find it.

• Unknown key: :order. Valid keys are: :class_name, :class, :foreign_key…

Change format something like that

has_many :commission_reports, :order => "volume_year DESC, volume_month DESC", :dependent => :destroytohas_many :commission_reports, -> { order "volume_year DESC, volume_month DESC" }, dependent: :destroy

• undefined method `on' for #<ActiveModel::Errors

Rails 4, the problem is that there's no "on" method for the Errors class anymore. We use "get". From

Change format something like that

@user.contact.errors.on(:attended_before)

 to

@user.contact.errors.get(:attended_before)

• undefined method `call' when doing a simple query

Change scope from all models from

scope :enquiry, where({:involvement => INVOLVEMENT_ENQUIRY, :archived => false})

to

scope :enquiry, -> { where({:involvement => INVOLVEMENT_ENQUIRY, :archived => false}) }

• Fix Typical Syntax on has_many like associations 

has_many :prices, -> { includes(:country).order("created_at desc") }, as: :priceable, dependent: :destroy, class_name: "Price"

• Undefined method confirmed_me?

remove :confirmable from model where we have defined the devise parameters eg User model if not using

• Unknown key: :include

Change has_many statement

• NoMethodError (undefined method `authenticated?' )

FInd authenticated?  and replace with devise method valid_password?

• NoMethodError (undefined method `forget_me' for

Copy forget_me method from restful-authentication to User model

• link_to_function and the view helper with postfix _tag doesn’t work in rails 4 so the solution is

Add  Gem  into the gem file

gem 'prototype-rails'

In rails 2 prototype was supported but in rails 3 the jquery supports so we get the errors like

• Keep in mind that the rails 2 already create a application.js and application.css in public folder so do not create same name files in assets folder. That can also give you conflicts.
• element.dispatchEvent is not a function

Go to layout and check application layout

Here you have include the app/assets and public/assets together

So keep in mind the hierarchy of inclusion of files, in short

first jquery

second prototype

referred link

http://learn.jquery.com/using-jquery-core/avoid-conflicts-other-libraries/

<script src="prototype.js"></script>

<script src="jquery.js"></script>

After that include below in head of the html file the below line

<script>jQuery.noConflict();</script>

• javascript_include_tag :default doesn’t work in rails 4
• calendar_date_select doesn’t work in rails 4
• LocalJump Error

This is due to the return keyword written in block. So remove return from the block.

• undefined method `scoped' for

scoped method has been deprecated from rails 4. use all on place of it.

• Search Or.. functionality was not working so change it that code

Replace div with some some id

• Move all the assets from public folder to app folder