I have numerous paginations in my application; they all look alike; all but
one work fine. The one broken one breaks at the very last step. The details
are below. I have 3 classes- Micropost, Category, Selection. I have a
link that points to details_controller, which renders a view
/selections/detailslist which in turn renders the partial
/selections/details. The code successfully gets to the last view and breaks
in the third line, with the error message "undefined local variable or
method `micropost' for #<#<Class: ...." Any help here would be greatly
appreciated.
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
****** view with link *****
<li>
<span class="selection">
<%= selection.content %>
   
( <%= selection.count %> )
   
<%= 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
******* view /selections/detailslist**********
<% @category = Category.find_by_id(@selection.category_id) %>
<h3> <%= @category.content %> </h3>
<br>
<%= @selection.content %>
 
( <%= @selection.count %> )
<br>
<ol class="selections">
<%= render partial: 'selections/details', collection: @microposts %>
</ol>
<%= will_paginate @microposts %>
*****view selections/details *************
<li>
<span class="selection">
<% user = User.find_by_id(micropost.user_id) %>
<%= user.name %>
</span>
</li>
****** error message *********
undefined local variable or method `micropost' for #<#<Class:
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