undefined method `write_inheritable_attribute' for Rails::Generator::Base:Class (NoMethodError)

Question

I am working on rails, suddenly rails server stops working. It\'s working fine and I have used following command [platform windows 7]

gem install -v=2.3.5 ra         


        

Answer 1

I had this issue, and it happens that I was in using the wrong ruby and gemset in rvm.

Answer 2

I had the same problem, but it was the result of having the gem rmagick.

I ran the following:

gem uninstall rmagick 
gem cleanup 

And then re-ran bundle in my stack and it worked for me again.

Answer 3

(@jeremy-f and @alex-villa are on the right track to identifying the problem itself.)

The problem here is that the rails ... command in Rails version 2 is a generator, equivalent to rails new ... in Rails 3+. So rails s is a Rails 2 command to generate a new Rails 2 app called "s" (whereas most of us when we write rails s intend the Rails 3 usage, i.e. start a server!)

If you install a gem, it will usually install its binary in the path, so you should be able to cause this error by doing gem install rails -v 2.3.15 then rails s as the OP says.

Three ways to fix it:

• gem install rails to install a newer version of Rails (you may have to specify a version >= 3.0)
• Run the app with bundle exec rails s (only if you have Rails 3 in your Gemfile)
• The usual way to run a Rails 2 project is simply script/server

Answer 4

if you are using latest version of rails 3 or rails 4 then use class_attributes instead of write_inheritable_attribute, i.e.

class_attribute :variable_name
self.variable_name = value

instead of

write_inheritable_attribute(:variable_name, value)

Answer 5

Running bundle exec rails s worked for me.

My project was using Rails 3.x but when I ran rails -v I got 2.3.17 which is the version used by a project I worked on just before. Somehow installing this version must have be set as "default".

Could someone explain this ?

Answer 6

I have solved this issue. Use following command and problem gone

 gem install rails

This will install updated rails and all thing working find again.