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我的申请中有很多分页；它们看起来都一样；除了一个工作正常。一个坏了，一个在最后一步就坏了。详情如下。我有 3 个课程——Micropost、Category、Selection。我有一个指向 details_controller 的链接，它呈现一个视图 /selections/detailslist，该视图又呈现部分 /selections/details。代码成功到达最后一个视图并在第三行中断，并显示错误消息“未定义的局部变量或方法 `micropost' for #<#< Class: ....”这里的任何帮助将不胜感激。 

class Micropost < ActiveRecord::Base
  attr_accessible :content, :category_content, :selection_content, :category_id, :selection_id, :user_id

  belongs_to :user
  belongs_to :category
  belongs_to :selection
  validates :user_id, presence: true
  validates :category_content, presence: true
  validates :selection_content, presence: true
end


class Category < ActiveRecord::Base
  attr_accessible :content, :id, :count, :c_count
  has_many :selections
  has_many :microposts
end

class Selection < ActiveRecord::Base
  attr_accessible :content, :count, :category_id
  belongs_to :category
  has_many :microposts
end

带链接查看

<li>
  <span class="selection">
    <%= selection.content %>
    &nbsp &nbsp
    ( <%= selection.count %> )
    &nbsp   &nbsp
    <%= link_to "Details", controller: :details, param1: selection.id, param2: selection.category_id %>
  </span>
</li>

details_controller

class DetailsController < ApplicationController
  require 'will_paginate/array'
  respond_to :html, :js

  def index
    #@category = Category.find_by_id(params[:param2])
    @selection = Selection.find_by_id(params[:param1])
    @microposts = @selection.microposts.paginate(page: params[:page])
    render '/selections/detailslist'
  end
end

查看：/selections/detailslist

<% @category = Category.find_by_id(@selection.category_id) %>
<h3> <%= @category.content %>   </h3>
    <br>
    <%= @selection.content %>
    &nbsp
    ( <%= @selection.count %> )
    <br>
<ol class="selections">
  <%= render partial: 'selections/details', collection: @microposts %>
</ol>
<%= will_paginate @microposts %>

查看：选择/详细信息

<li>
  <span class="selection">
    <% user = User.find_by_id(micropost.user_id) %>
    <%= user.name %>
  </span>
</li>

错误消息：#<#< Class:0x007fed1811ba90>:0x007fed17bc9fb0> 的未定义局部变量或方法 `micropost'

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