ver las categorias de un post y poder filtrar

app/controllers/posts_controller.rb

@@ -3,6 +3,7 @@ class PostsController < ApplicationController
 
   def index
     @site = find_site
+    @category = session[:category] = params.dig(:category)
   end
 
   def show
@@ -39,7 +40,7 @@ class PostsController < ApplicationController
     @post.update_attributes(p)
 
     if @post.save
-      redirect_to site_post_path(@site, @post)
+      redirect_to site_posts_path(@site, category: session[:category])
     else
       render 'posts/edit'
     end

app/views/layouts/_breadcrumb.haml

@@ -1,6 +1,6 @@
 %nav{'aria-label': 'breadcrumb', role: 'navigation'}
   %ol.breadcrumb
-    - crumbs.each do |crumb|
+    - crumbs.compact.each do |crumb|
       - if crumb == crumbs.last
         %li.breadcrumb-item.active{'aria-current': 'page'}= crumb
       - else

app/views/posts/index.haml

@@ -1,6 +1,6 @@
 .row
   .col
-    = render 'layouts/breadcrumb', crumbs: [ link_to(t('sites.index'), sites_path), @site.name, t('posts.index') ]
+    = render 'layouts/breadcrumb', crumbs: [ link_to(t('sites.index'), sites_path), @site.name, link_to(t('posts.index'), site_posts_path(@site)), @category ]
 .row
   .col
     %h1= @site.name
@@ -15,10 +15,15 @@
     %table.table.table-condensed.table-striped
       %tbody
         - @site.posts.each do |post|
+          - if @category
+            - next unless post.categories.include?(@category)
           - direction = post.get_front_matter(:dir)
           %tr
             %td{class: direction}
               = link_to post.title, site_post_path(@site, post)
               %br
-              %small= post.categories.join(', ')
+              %small
+                - post.categories.each do |c|
+                  = link_to c, site_posts_path(@site, category: c)
             %td= post.date.strftime('%F')
+            %td= link_to t('post.edit'), edit_site_post_path(@site, post)