Add unfollow user button

app/controllers/users_controller.rb

@@ -28,6 +28,16 @@ def follow
    end
  end

  def unfollow
    @user = User.find(params[:id])

    if current_user.unfollow!(@user)
      redirect_to @user, notice: "Unfollow successful!"
    else
      redirect_to @user, alert: "Error unfollowing."
    end
  end

  private

  def user_params

app/models/user.rb

@@ -31,6 +31,12 @@ def follow!(leader)
    end
  end

  def unfollow!(leader)
    if leader != self && following?(leader)
      leaders.delete(leader)
    end
  end

  def timeline_user_ids
    leader_ids + [id]
  end

app/views/users/show.html.erb

@@ -8,8 +8,15 @@
  <p class="lead">API Token: <%= @user.api_token %></p>
<% end %>

<%= link_to "Follow", follow_user_path(@user),
      method: :post, class: "btn btn-default" %>
<% if current_user && current_user != @user %>
  <% if current_user.following?(@user) %>
    <%= link_to "Unfollow", unfollow_user_path(@user),
          method: :delete, class: "btn btn-default" %>
  <% else %>
    <%= link_to "Follow", follow_user_path(@user),
          method: :post, class: "btn btn-default" %>
  <% end %>
<% end %>

<h2>Posts</h2>

config/routes.rb

@@ -8,6 +8,7 @@

  get 'signup', to: 'users#new', as: 'signup'
  post 'follow/:id', to: 'users#follow', as: 'follow_user'
  delete 'unfollow/:id', to: 'users#unfollow', as: 'unfollow_user'

  get 'login', to: 'sessions#new', as: 'login'
  get 'logout', to: 'sessions#destroy', as: 'logout'