Ruby on Rails

My app/controllers/blog_controller.rb:

class BlogController < ApplicationController
  require 'date'

  caches_page :index, :show

  def index
          if (params[:population_categories])
      @blog_posts = BlogPost.live.where(:population_category_ids =>
params[:population_categories]).latest.page(params[:page])
      # @blog_posts = BlogPost.find(:all, :conditions => ['created_at >
? AND created_at < ?', b_dt.strftime("%Y-%m-%d %H:%M"),
e_dt.strftime("%Y-%m-%d %H:%M")]).latest.page(params[:page])
    elsif (params[:month])
      b_dt = DateTime.strptime("01/" + params[:month].to_s + "/" +
params[:year] + " 00:00", "%d/%m/%Y %H:%M")
      e_dt = DateTime.strptime("01/" + (params[:month].to_i+1).to_s +
"/" + params[:year] + " 00:00", "%d/%m/%Y %H:%M")

      @blog_posts = BlogPost.live.where(:created_at =>
b_dt.strftime("%Y-%m-%d %H:%M DESC")..e_dt.strftime("%Y-%m-%d %H:%M
DESC") ).latest.page(params[:page] )

  #@blog_posts = @posts.group_by { |t| t.publication_date
.beginning_of_month }
    else
      @blog_posts =
BlogPost.live.keyword(params[:keyword]).latest.page(params[:page])
    end
 @posts_by_month = BlogPost.all.group_by { |post|
post.created_at.strftime("%m %Y") }
      end
  def show
    @blog_post = BlogPost.where(:url_fragment =>
params[:url_fragment]).first
    raise ActionController::RoutingError.new('Not Found') if
@blog_post.nil?
    @blog_posts =
BlogPost.live.keyword(params[:keyword]).latest.page(params[:page])
  @posts_by_month = BlogPost.all.group_by { |post|
post.created_at.strftime("%m %Y") }
  end
  def feed
    @posts_feed = BlogPost.where(:content_state => 'live')
    respond_to do |format|
      format.atom { render layout: false }
    end
  end
end

 app/controllers/month_posts_controler:

class MonthPostsController < ApplicationController
  def display
  @posts_by_month = BlogPost.all.group_by { |post|
post.created_at.strftime("%B") }
  #@posts_by_month = BlogPost.all.each { |post|
post.created_at.strftime("December") }

  end
  def show
  @posts = BlogPost.all.find(params[:id])
  @posts = Post.includes(:comments).order("created_at DESC").limit(5)
end
end


app/controllers/post_controller:
def index
    @posts = Post.all

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @posts }
      format.atom
    end
end

app/views/blog/index.html.erb
<div class='section white' id='blog_posts'>
  <div class='section_content'>
    <div class='section-left'>

      <% @blog_posts.limit(3).each do |post| %>
        <% @section_keywords += post.keywords_array %>
        <%= render :partial => '/blog/index/blog_post', :locals =>
{:atom => post} %>
      <% end %>

    <div class="right-col">
      <h2>ARCHIVES</h2>
      <div class='posts_by_month'>

        <ul>
        <% archive_string = "" %>
        <% date_value = "" %>
        <% @posts_by_month.each do |monthname, posts| %>

          <% date_value = (Date::MONTHNAMES[monthname[0..-6].to_i]) + "
" + (monthname[3..8]) %>
          <% archive_string = "<li><a class='filter' href='/blog?month="
+ monthname[0..-6] + "&year=" + monthname[3..8] + "'>" + date_value +
"</a></li>" + archive_string %>
        <% end %>
        <%= raw archive_string %>
        </ul>


      </div>
    </div>
    <div class="right-col">
      <div class="blogpost-rss">
        <a class="rss-link" href="/feed.atom"></a>
        <%= auto_discovery_link_tag(:rss, feed_url(:format => :atom)) %>

      </div>
    </div>

app/views/blog/show.html.erb:
<div class='section white blog_post blog_detail' id='blog_post'>

  <div class='section_content'>
         <div class="right-col">
    <h2>ARCHIVES</h2>
    <div class='posts_by_month'>
      <ul>
  <% archive_string = "" %>
  <% date_value = "" %>
  <% @posts_by_month.each do |monthname, posts| %>
  <% date_value = (Date::MONTHNAMES[monthname[0..-6].to_i]) + " " +
(monthname[3..8]) %>
  <% if(date_value == pub_date) %>
  <% archive_string = "<li class='active'><a class='filter'
href='/blog?month=" + monthname[0..-6] + "&year=" + monthname[3..8] +
"'>" + date_value + "</a></li>" + archive_string %>
        <% else %>
    <% archive_string = "<li><a class='filter' href='/blog?month=" +
monthname[0..-6] + "&year=" + monthname[3..8] + "'>" + date_value +
"</a></li>" + archive_string %>
        <% end %>
        <% end %>
      <%= raw archive_string %>
      </ul>

      </div>
      </div>

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