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copied!<p>I didnt do that tutorial so mind me if i dont answer directly to your question.</p> <p>Take a look at the <a href="http://guides.rubyonrails.org/form_helpers.html" rel="nofollow">rails guide about form helpers</a> and it explains in details your questions, probably in a more articulate way than i can.</p> <p><code>form_for(path/to/your/controller/action)</code> is a helper method to create HTML form elements with the url path to the POST or GET request. The helper knows if it should be a new record or an update record based on what you are asking to do in your controller action.</p> <p>For example In your controller</p> <pre><code>def new @my_instance_variable = Myobject.new end </code></pre> <p>In your view new.html.erb</p> <pre><code><%= form_for @my_instance_variable do |f| %> ... <% end %> </code></pre> <p>In your case the logic was directly written in the helper and you could also directly write</p> <pre><code><%= form_for Myobject.new %> </code></pre> <p>Both will result with the following html</p> <pre><code><form action="/myobjects/new" method="post"> # in this case rails knows its a `POST` request because the route new action # is by default a POST request. You can check these routes and their request # by using `rake routes` in terminal. </code></pre> <p>Then the <code>hidden_field</code> is another helper to contain a value, in your case the <code>@user.id</code> that will be passed as parameter then saved as a Create or update action for the given object. The reason it doesnt add the value in the hidden field tag is because you already have a model association that knows the id of user since the link of form uses the build method with user id.</p> <p>Last part you need to understand the form_for link logic </p> <pre><code>current_user.relationships # implies the association of the current_user has many relationships current_user.relationships.build # .build is a method to populate a new object that can be save as a new record # means you will create a new relationship record by populating the user_id # column with the current_user.id and the followed_id with the target @user.id </code></pre>

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