How to set up kaminari correctly

Question

I'm using kaminari gem for pagination. The problem is that I need to paginate on the first page after 4 elements, and on the all other pages after 25 elements. It it possible to configure kaminari to solve my problem? Here is a usage:

.pagination
  .pagination__back
    - if params[:page] && params[:page].to_i > 1
      = link_to "Previous news", news_items_path(page: params[:page].to_i - 1)
    - else
      = ""
  .pagination__forward
    - if params[:page]
      = link_to "Next news", news_items_path(page: params[:page].to_i + 1)
    - else
      = link_to "Next news", news_items_path(page: 2)

score 1 · Accepted Answer · answered May 18 '17 at 16:04

First of all you can leave out all the code related to forward/previous pages. Kaminari solves this with its helper already. For that matter, inside your view, use the following code:

= paginate @your_resource

This will render several ?page=N pagination links surrounded by an HTML5 tag. (Source)

To have a paginated resource, you want to add the following code to your controller:

@your_resource = YourResource.order(:foobar).page(params[:page])
# params[:page] will get added to each "paginated" request by Kaminari 
# if you use its previously mentioned helper method.

Now you want a dynamic limit. For that matter I suggest adding something like this:

def index
  @your_resource = YourResource.order(:foobar).page(params[:page]).per(dynamic_limit(params[:page]))
end

private
def dynamic_limit(current_page = 1)
  if current_page == 1
    return 4
  else
    return 25
  end
end

This way you will check for the current page, and if it's the first page it'll limit the results to 4. Otherwise, 25.

How to set up kaminari correctly

1 Answers1