Document how to generate slugs for existing documents

[paulspringett]

I had a hard time working out how add a slug retrospectively. Given the model:

class Product
  include Mongoid::Document
  include Mongoid::Slug

  field :name
  field :slug

  slug :name
end

I initially tried calling save but this doesn't generate it.
The only way I could find to create slugs for existing documents was:

Product.all.each do |product|
  product.send(:generate_slug!)
  product.save
end

This seems a bit hacky... Is there a better way to do this?

If so could you add it to the README?
If this is the only way, could you expose a public method to generating slugs on existing documents?

[hakanensari]

Looks fine to me—as long as you don't have a large collection.

A somewhat shorter way to write could be:

Product.all.each &:to_param

See here.

This kind of stuff could go into the Wiki.

[paulspringett]

@hakanensari to_param was what I was looking for - thank you! I'll submit a pull request to add this to the README

[monfresh]

I still don't see this documented in the README or in the Wiki.
.all.each &:to_param didn't work for me. This is what worked:

Product.all.each do |product|
  product.send(:set_slug)
  product.save
end

Is this the right way to do it?

[niketpuranik]

.all.each &:to_param didn't work for me. This is what worked:

Product.all.each do |product|
product.send(:build_slug)
product.save
end