ruby on rails 4 - Creating a mutual friends list -

i've been through treebook tutorial on treehouse , i've been trying enhance it.

i want add together list of mutual friends on profile_page shows friends have in mutual user.

i can write if statement show profile_name of mutual users.

e.g.

    <% if current_user.friends.include?(friend) , @user.friends.include?(friend) %>       <%= friend.profile_name %>     <% end %>

but i'd write block go through , show other information. how create query in profiles controller can utilize in block?

so want like:

def common_friends friends.where(friends: [friend1, friend2]) end

this way querying friends friend list includes both friend1 , friend2.

ruby-on-rails-4

Three