No route matches {:action=>"update", :controller=>"" - Rails 5 - ruby-on-rails

Question

I am getting the below error and unsure how to correct it - your help would be much appreciated.
when at a users show page, i do not get the error, but when at for example at any other page...such as the events index.html page the error displays
No route matches {:action=>"update", :controller=>"friendships", :friend_id=>#<User id: 5, email: "ian#gmail.com"
expanded error in terminal
Started GET "/events" for ::1 at 2016-12-17 12:44:43 +0000
Processing by EventsController#index as HTML
User Load (0.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT 1 [["id", 4]]
User Load (0.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1 [["id", 4]]
User Load (0.3ms) SELECT "users".* FROM "users" WHERE "users"."email" IS NULL LIMIT 1
Subscription Load (0.1ms) SELECT "subscriptions".* FROM "subscriptions" WHERE "subscriptions"."title" = ? LIMIT 1 [["title", "premium"]]
User Load (0.1ms) SELECT "users".* FROM "users" INNER JOIN "friendships" ON "users"."id" = "friendships"."friend_id" WHERE "friendships"."user_id" = ? AND "friendships"."status" = ? [["user_id", 4], ["status", "requested"]]
(0.2ms) SELECT COUNT(*) FROM "users" INNER JOIN "friendships" ON "users"."id" = "friendships"."friend_id" WHERE "friendships"."user_id" = ? AND "friendships"."status" = ? [["user_id", 4], ["status", "requested"]]
Rendered shared/_content_dropdownbox_friendrequest.html.erb (4.8ms)
Rendered shared/_header.html.erb (10.7ms)
Rendered events/index.html.erb within layouts/application (11.8ms)
Completed 500 Internal Server Error in 23ms
ActionController::UrlGenerationError - No route matches {:action=>"update", :controller=>"friendships", :friend_id=>#<User id: 5, email: "ian#gmail.com", encrypted_password: "$2a$10$PMO5FPBzjjnFHI/ye8rfP.ONtHP3gagXomj1sbruBXH..."
route file
Rails.application.routes.draw do
resources :friendships, only: [:create, :update, :destroy]
devise_for :users
resources :users
end
views/shared/_content_dropdownbox_friendrequest.html.erb
<ul>
<% current_user.requested_friends.each do |requester| %>
<li>
<%= link_to(image_tag(requester.image_url, :alt => "image", :class =>"#", id: ""), user_path(requester)) %>
<%= link_to truncate("#{requester.firstname} #{requester.lastname}", length: 23), user_path(requester) %>
<%= link_to 'Accept', friendship_path(user_id: current_user, friend_id: requester), controller: "friendships", action: "update", method: :put %>
<%= link_to 'Decline', friendship_path(user_id: current_user, friend_id: requester), controller: "friendships", action: "decline", method: :delete %>
</li>
<div class="clear"></div>
<% end %>
</ul>
frienships_controller
class FriendshipsController < ApplicationController
before_action :authenticate_user!
before_filter :setup_friends
# Sends a friend request.
# We'd rather call this "request", but that's not allowed by Rails.
def create
Friendship.request(#user, #friend)
flash[:notice] = "Request sent."
redirect_to :back
end
# Accepts a friend request.
# We'd rather call this "accept", but that's not allowed by Rails.
def update
#user = User.friendly.find(params[:user_id])
#friend = User.friendly.find(params[:friend_id])
if #user.requested_friends.include?(#friend)
Friendship.accept(#user, #friend)
flash[:notice] = "Connection with #{#friend.firstname} accepted!"
else
flash[:notice] = "No connect request from #{#friend.firstname}."
end
redirect_to :back
end
def destroy
#user = User.friendly.find(params[:user_id])
#friend = User.friendly.find(params[:friend_id])
if #user.requested_friends.include?(#friend) #decline
Friendship.breakup(#user, #friend)
redirect_to :back
elsif #user.pending_friends.include?(#friend) #cancel
Friendship.breakup(#user, #friend)
redirect_to :back
elsif #user.friends.include?(#friend) #delete
Friendship.breakup(#user, #friend)
redirect_to :back
end
end
private
def setup_friends
#user = User.find(current_user.id)
#friend = User.find_by_email(params[:id])
end
end
i am unsure how to solve the error, i tried something like the below but does not work:
<span>
<%= form_for friendship, url: friendship_path(requester), method: :put do |f| %>
<%= f.hidden_field :user_id, value: current_user.id %>
<%= f.hidden_field :friend_id, value: requester.id %>
<%= submit_tag "Accept_test", controller: "friendships", action: "update", class: "btn btn_add_friend" %>
<% end %>
</span>

Answer 1

update controller is waiting for an id parameter, while the only parameters you pass are user_id and friend_id.
You can change your routes to the following
resources :friendships, only: [:create, :destroy] do
collection do
put :update
end
end