undefined method `friendly' getting error from controller

Question

I have work on project with ruby on rails and i want to use friendly_id gem. When I install friendly_id gem in my project then add following code according to instructions.

controller:

def show
    @group = Group.friendly.find(params[:id])
end

Model:

extend FriendlyId
friendly_id :title, use: [:slugged]

I am using rails version 3.2.11 and friendly_id gem is 4.0.0

Getting error in controller. i do not understand why its happening.

error:

undefined method `slug' for #<Group:0x000000092ac228>

Update :

Previous issue solve with restart server and migrating database.

but it generates new issue Couldn't find group with id=new-demo-group

Answer 1

It seems like you need to update the records that are already created, in your case that would be (Group model), as docs says:

If you're adding FriendlyId to an existing app and need to generate slugs for existing users, do this from the console, runner, or add a Rake task:

Group.find_each(&:save)

Rails console

Open terminal on the app root and run (-e is the environment)

rails console -e production

You should get a similar output to this (I added the command to run):

Running via Spring preloader in process 5389
Loading production environment (Rails 5.1.5)
2.5.1 :001 > Group.find_each(&:save)

Rails runner

Open terminal on the app root and run (-e is the environment)

rails runner -e production "Group.find_each(&:save)"