Must use page_method_name for all Kaminari pagination

[carsonreinke]

Fixes #2711

[mshibuya]

Spec is failing, can you make it pass?

[carsonreinke]

Yeah, Kaminari defines the pagination method statically like this:

    # items at the specified "page"
    class_eval <<-RUBY, __FILE__, __LINE__ + 1
      def #{Kaminari.config.page_method_name}(num = 1)
        offset(limit_value * ((num = num.to_i - 1) < 0 ? 0 : num))
      end
    RUBY

So really, tests were wrong before. Their classes would have to be forcefully reloaded to change the pagination method on the fly.

[carsonreinke]

Without having a fork of some sort, it is not really possible to dynamically change the Kaminari page method. The ActiveRecord portion is even more complicated to try and reload.

I see 3 tests that are incorrectly using this approach.

Any advice, thoughts, wisdom to get something setup would be appreciated.

[mshibuya]

Added a spec in 73ce325, thanks.