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copied!<p>This is a fairly straight forward use of Ruby on Rails. I recommend reading <a href="http://guides.rubyonrails.org/active_record_basics.html" rel="nofollow noreferrer">Active Record Basics</a> to get up to speed.</p> <p>First, you should have a belongs_to relationship between Posts and Users that looks like this:</p> <pre><code>class User < ActiveRecord::Base has_many :posts end class Post < ActiveRecord::Base belongs_to :user end </code></pre> <p>This adds a <code>.posts</code> method to the <strong>User instance</strong> and a <code>.user</code> method to the <strong>Post instance</strong>.</p> <p>Then you have to make a decision about how you want the URL structure of your application to work. Here are a few options from the top of my head:</p> <ol> <li>/posts?user=:user_id</li> <li>/posts/by/:user_id</li> <li>/users/:id/posts</li> </ol> <p>Given the relationship between a User and their Posts, my recommendation (and I believe the general "Rails Way") would be #3. So, let's add the routes to <code>config/routes.rb</code>:</p> <p>The short way to create JUST that route:</p> <pre><code>get 'users/:id/posts' => 'users#posts', :as => :user_posts </code></pre> <p>The long way to create the route based on <a href="http://guides.rubyonrails.org/routing.html" rel="nofollow noreferrer">resources</a>:</p> <pre><code>resources :users do member do get :posts end end </code></pre> <p>Both approaches will provide a helper method called <code>user_posts_path</code> and one called <code>user_posts_url</code> which can be used in your view to link to the list of user posts using the <strong>link_to</strong> helper method:</p> <pre><code><%= link_to post.user.name, user_posts_path(post.user) %> </code></pre> <p>Now, you have to add the controller action in <code>app/controllers/users_controller.rb</code>:</p> <pre><code>class UsersController < ActionController::Base def posts @user = User.find(params[:id]) @posts = @user.posts end end </code></pre> <p>and then add your HTML/ERB code to <code>app/views/users/posts.html.erb</code></p> <pre><code><% @posts.each do |post| %> <%= post.inspect %> <% end %> </code></pre> <p>That should give you the basic ability to show a user's posts. You can enhance it by reusing a post partial or some other nice shortcuts, but I'll leave that as an exercise for you to figure out.</p>

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