Will Paginate Gem适配Elastic Search数组：自定义总页数解决分页报错

Absolutely! You can absolutely use will_paginate with your Elasticsearch results—you just need to give the gem the total number of entries it needs to calculate pagination metadata like total_pages. Here's how to fix that error and get pagination working smoothly:

The root issue here is that will_paginate expects the object it receives to respond to pagination-specific methods (like total_pages, current_page). Plain Ruby arrays don’t have these methods by default, but will_paginate has a built-in extension to handle arrays, and we can feed it the total number of matching documents from Elasticsearch to make everything work.

Step 1: Load the will_paginate Array extension #

First, add this line to your Gemfile (then run bundle install) or to an initializer file (like config/initializers/will_paginate.rb):

require 'will_paginate/array'

This adds pagination capabilities directly to Ruby arrays.

Step 2: Capture total results from Elasticsearch #

When you run your Elasticsearch query, grab the total number of matching documents. The exact syntax depends on your Elasticsearch client version:

• For Elasticsearch v7+ (newer clients):

  response = YourModel.search(your_query)
  total_entries = response.hits.total.value
  

• For older Elasticsearch versions:

  total_entries = response.total
  

Step 3: Paginate your array with explicit total entries #

Instead of passing the raw array to will_paginate, use the paginate method on your results array, and pass the total_entries parameter with the value you pulled from Elasticsearch:

# In your controller action
@data = response.results.to_a.paginate(
  page: params[:page],
  per_page: 10, # Adjust this to your preferred items per page
  total_entries: total_entries
)

Step 4: Use will_paginate in your view as normal #

Now @data is wrapped in a WillPaginate::Collection object that has all the methods the gem needs. Your original view code will work without errors:

<%= will_paginate @data %>

Why this works #

The will_paginate/array extension adds a paginate method to arrays that converts them into a WillPaginate::Collection. This object includes all the pagination metadata methods (like total_pages)—and by passing total_entries, you tell it the full count of results from Elasticsearch, so it can calculate total pages, next/previous links, etc., correctly.

Alternative: Manually create a WillPaginate::Collection #

If you prefer a more explicit approach, you can directly instantiate the collection instead of using the array extension:

@data = WillPaginate::Collection.create(params[:page], 10, total_entries) do |pager|
  pager.replace(response.results.to_a)
end

This achieves the same result, but using the array extension is more concise for most cases.

内容的提问来源于stack exchange，提问作者Barath Kumar