kaminari + JSON API pagination helper

paginate.rb

def paginate(scope, default_per_page = 20)
  collection = scope.page(params[:page]).per((params[:per_page] || default_per_page).to_i)

  current, total, per_page = collection.current_page, collection.num_pages, collection.limit_value

  return [{
    pagination: {
      current:  current,
      previous: (current > 1 ? (current - 1) : nil),
      next:     (current == total ? nil : (current + 1)),
      per_page: per_page,
      pages:    total,
      count:    collection.total_count
    }
  }, collection]
end

Awesome! Works perfectly with a Rails 5.1 + Webapacker + Vue app, thanks!

Hi, thanks for the share, but there's something need to be updated.

The collection.num_pages should be changed to collection.total_pages.

Please reference: https://github.com/kaminari/kaminari/releases/tag/v1.0.0.beta1

Where is that file supposed to be? is it a helper?

For Rails + Jbuilder :

In your resource index ( users for example ) :

app/views/users/index.json.jbuilder

.
.
json.partial! "shared/pagination", collection: @users

app/views/shared/_pagination.json.jbuilder

json.pagination do
  current, total, per_page = collection.current_page, collection.total_pages, collection.limit_value
  json.current  current
  json.previous (current > 1 ? (current - 1) : nil)
  json.next     (current == total ? nil : (current + 1))
  json.per_page per_page
  json.pages    total
  json.count    collection.total_count
end

Nice script.

Thanks!

In addition to the @AhmedKamal20 answer above.

Its better to use the pre given methods by kaminari gem for all the values. Also, in my case I also need the data as well so also added that as well in the pagination.

app/views/shared/_pagination.json.jbuilder

json.pagination do
  json.current         collection.current_page
  json.previous        collection.prev_page
  json.next            collection.next_page
  json.limit           collection.limit_value
  json.total_pages     collection.total_pages
  json.total_count     collection.total_count

  json.data            collection # if want to send the data as well. In my case I am sending data. 
end

Hi, thanks for the share, but there's something need to be updated.

The collection.num_pages should be changed to collection.total_pages.

Please reference: https://github.com/kaminari/kaminari/releases/tag/v1.0.0.beta1

🚀