Kevin,
Thank you so much. It works!
Ephraim

On Friday, August 16, 2013 12:22:55 PM UTC-7, Ephraim Feig wrote:
>
> 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 %>
>     &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
>
> *******  view /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 %>
>
>
> *****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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