Quick and Dirty Rails Pagination Extension With Scope

paged_scope.rb

module ActiveSupport
  module PagedScope
    def self.extended(base)
      base.scope :paginated, lambda { |page,per_page|
        page ||= 0
        per_page ||= 25

        base.limit( per_page.to_i ).offset( per_page.to_i * page.to_i )
      }
    end
  end
end

class User < ActiveRecord::Base
  extend ActiveSupport::PagedScope
end

>> User.paginated(1,25).count
=> 25

Thanks for the gist!
I'm a Rails beginner and was using will_paginate gem just for .paginate method alone, but for my case it did make more sense to implement some custom scope instead of a whole gem. So, based on your gist I did:

class SomeModel < ActiveRecord::Base
  scope :paginatee, -> (pagination) {
    limit( pagination[:per_page].to_i ).offset( pagination[:per_page].to_i * (pagination[:page].to_i - 1))
  }
end

Example use:

SomeModel.pagination(page: 1, per_page: 10).to_sql
#=> "SELECT  \"some_models\".* FROM \"some_models\" LIMIT 10 OFFSET 0")
SomeModel.pagination(page: 4, per_page: 5).to_sql
#=> "SELECT  \"some_models\".* FROM \"some_models\" LIMIT 5 OFFSET 15")