如何检查记录是否分页/将分页？

Question

我正在使用WillPaginate Ruby gem v3.1.6。

鉴于您可以运行@posts = Post.all.paginate(page: params[:page])或@posts = Post.all，有没有一种方法可以检查@posts当前是否在分页？也就是说，@posts是否正在运行/使用WillPaginate？

我想要做的事情如下：

if @posts.will_paginate? # or @posts.paginated?
  # paginated @posts
else
  # not paginated @posts

---

通过查看宝石source code，我会使用...

def will_paginate? # or paginated?
  @posts.respond_to?(:total_pages)
end

...或以某种方式检查WillPaginate是@posts的类祖先，但是也许有更好的方法来检查记录是否被分页。

Answer 1

def paginated?
  @posts.count > WillPaginate.per_page
end

您可以通过per_page在Post模型上，本地或全局设置WillPaginate.per_page。

讨论后编辑

model / car.rb

class Car
  def paginated? 
    false
  end
end

model / post.rb

class Post
  def paginated? 
    true
  end
end

OR

views / shared / _universal.html.erb

<!-- renders your universal layout for the number of objects -->
<% @items.each do |item| %>
    <div><%= item.property %></div>
<% end %>

views / cars / index.html.erb

...
<%= render partial 'shared/_universal.html.erb', locals: { items: @cars } %>

views / posts / index.html.erb

...
<%= render partial 'shared/_universal.html.erb', locals: { items: @posts } %>
<%= will_paginate @posts %>