Rails Will_Paginate抛出未定义的局部变量或方法

Question

I've been having trouble with will_paginate based on an example from Michael Hartel's Ruby on Rails book 9.3.3.

Here is my views/professors/index.html.erb:

    <% provide(:title, 'All Professors') %>
<h2>All Users</h2>
<%= will_paginate %>
<ul class="users">
  <% @professors.each do |professor| %>
  <li>
    <%= link_to professor.lname, professor %>
  </li>
  <% end %>
</ul>
<%= will_paginate %>

and the professors controller:

  def show
    @professor = Professor.find(params[:id])
    @professors = Professor.paginate(page: params[:page])
  end

I keep getting the: undefined local variable or method `will_paginate' for #class.... error.

From what I've seen Hartel's version is a bit different then what the will_paginate docs say to do they have:

@posts = Post.paginate(:page => params[:page])

In the controller and

<%= will_paginate @posts %>

on the render page. I've tried that too and I get an undefined method error. Also tried the variable in parenthisees (which I have seen some answers on here suggesting).

Answer 1

You are showing the template for the index action and the controller for the show action. You also appear to have <%= will_paginate %> twice both without anything passed in. Can you update your question.

You need to move your @professors assignment to def index and not def show and then it should work when going to localhost:3000/professors or whatever your path is setup as.