The follow/unfollow partials themselves are shown in Listing 11.25 and Listing 11.26.

These two forms both use form_for to manipulate a Relationship model object; the main difference between the two is that Listing 11.25 builds a new relationship, whereas Listing 11.26 finds the existing relationship. Naturally, the former sends a POST request to the Relationships controller to create a relationship, while the latter sends a DELETE request to destroy a relationship. (We’ll write these actions in Section 11.2.4.) Finally, you’ll note that the follow/unfollow form doesn’t have any content other than the button, but it still needs to send the followed_id, which we accomplish with the hidden_field method, which produces HTML of the form