No route matches in Rails code - ruby-on-rails

Question

This code is all based on the Ruby on Rails tutorial by Michael Hartl. I created an assigned action in my users_controller with
def assign
puts "in assign..."
#scout = User.find(params[:follower_id])
#der = User.find(params[:followed_id])
end
I realize this doesn't do anything currently, but in the _follow partial, I have
<%= form_for #user, url: { action: "assign" } do |f| %>
<div><%= hidden_field_tag :follower_id, #user.id %></div>
<%= f.label :followed_id, "Assign #{#user.name} to" %>
<%= f.collection_select :following, #ders, :id, :name, prompt: true %>
<%= f.submit "Assign", class: "btn btn-primary" %>
<% end %>
But I'm getting the error No route matches {:action=>"assign", :controller=>"users", :id=>"4"}. I'm new to rails so this could just be a stupid question. What am I doing wrong? Do I need to modify my routes.rb file? Also, if I tried <%= form_for #user do |f| %>, how does the controller know which action to use? Is it based on the action displaying the form?
Edit: my routes.rb file is
Rails.application.routes.draw do
root 'static_pages#home'
get 'help' => 'static_pages#help'
get 'about' => 'static_pages#about'
get 'contact' => 'static_pages#contact'
get 'signup' => 'users#new'
get 'login' => 'sessions#new'
post 'login' => 'sessions#create'
delete 'logout' => 'sessions#destroy'
resources :users do
member do
get :following, :followers
end
end
resources :account_activations, only: [:edit]
resources :password_resets, only: [:new, :create, :edit, :update]
resources :relationships, only: [:create, :destroy]
end
Edit 2: the HTML generated by #Rich's form_for block is
<form class="edit_user" id="edit_user_5" action="/users/5/assign" accept-charset="UTF-8" method="post">
<input name="utf8" type="hidden" value="✓">
<input type="hidden" name="_method" value="patch">
<input type="hidden" name="authenticity_token" value="...">
<label for="user_followed_id">Assign Mr. Marley Muller to</label>
<select name="user[following]" id="user_following">
<option value="1">Example User</option>
<option value="2">Matthew Swartz</option>
<option value="3">Joseph Swartz</option>
</select>
<input type="submit" name="commit" value="Assign" class="btn btn-primary">
</form>
Which makes sense why I'm currently getting a can't find id error since it's not sending a real id (edit_user_5)
Edit 3: Here are the parameters being passed for the request
Started PATCH "/users/6/assign" for 68.100.59.128 at 2015-12-15 03:54:39 +0000
Processing by UsersController#assign as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"...", "user"=>{"following"=>"2"}, "commit"=>"Assign", "id"=>"6"}
User Load (0.5ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1 [["id", 6]]
Unpermitted parameter: following
User Load (0.5ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1 [["id", nil]]
Completed 404 Not Found in 9ms (ActiveRecord: 1.0ms)
ActiveRecord::RecordNotFound (Couldn't find User with 'id'=):
app/controllers/users_controller.rb:69:in `assign'
Edit 4: With the following routes file,
Rails.application.routes.draw do
root 'static_pages#home'
get 'help' => 'static_pages#help'
get 'about' => 'static_pages#about'
get 'contact' => 'static_pages#contact'
get 'signup' => 'users#new'
get 'login' => 'sessions#new'
post 'login' => 'sessions#create'
delete 'logout' => 'sessions#destroy'
resources :users do
member do
get :following, :followers
match :assign, to: :assign, via: [:post, :patch]
end
end
resources :account_activations, only: [:edit]
resources :password_resets, only: [:new, :create, :edit, :update]
resources :relationships, only: [:create, :destroy]
end
and the following form for assigning one user to follow another,
<%= form_for #user, url: { action: "assign" } do |f| %>
<%= f.label :follower_id, "Assign #{#user.name} to" %>
<%= f.collection_select :following, #ders, :id, :name, prompt: true %>
<%= f.submit "Assign", class: "btn btn-primary" %>
<% end %>
I am getting the ActiveRecord::RecordNotFound in UsersController#assign error of Couldn't find User with 'id'=, but with the following parameters:
{"utf8"=>"✓",
"_method"=>"patch",
"authenticity_token"=>"...",
"user"=>{"following"=>"3"},
"commit"=>"Assign",
"id"=>"4"}
The ID's are correct: "user"=>{"following"=>"3"} and "id"=>"4", I believe I am just trying to access them incorrectly. This is the assigns action in the users controller:
def assign
#scout = User.find(params[:id])
#der = User.find(params_hash[:followed_id])
# make scout follow der here
redirect_to #scout
end
Thoughts?

Answer 1

In your routes.rb file you have to define the route for the specific controller action like that:
resource :users do
member do
post 'assign' # change the request method to 'put'
end
end
It will then generate a route for your assign method in the controller like: users/4/assign
For more info visit guides

Answer 2

To add to Emu's answer, the code you have won't work...
def assign
puts "in assign..."
#scout = User.find(params[:follower_id])
#der = User.find(params[:followed_id])
end
The params you'd get from the form_for object would be structured as:
params[:user][:follower_id]
params[:user][:followed_id]
You'd have to use the following:
#app/controllers/users_controller.rb
class UsersController < ApplicationController
def assign
#scout = User.find params[:id]
#der = User.find params_hash[:followed_id]
end
private
def params_hash
params.require(:user).permit(:followed_id)
end
end
You could also get rid of the hidden field in your form if you're using the same #user object to populate it:
<%= form_for #user, url: { action: "assign" } do |f| %>
<%= f.label :followed_id, "Assign #{#user.name} to" %>
<%= f.collection_select :following, #ders, :id, :name, prompt: true %>
<%= f.submit "Assign", class: "btn btn-primary" %>
<% end %>
Update
You need to include :assign in your routes:
Rails.application.routes.draw do
root 'static_pages#home'
resources :static_pages, only: [], path: "" do
collection do
get :help, :about, :contact
end
end
resources :sessions, only: [:new, :create, :destroy], path_names: {new: "login", create: "login", destroy: "logout"}
resources :users, path_names: { new: "signup" } do
member do
get :following, :followers, :assign
end
end
resources :account_activations, only: [:edit]
resources :password_resets, only: [:new, :create, :edit, :update]
resources :relationships, only: [:create, :destroy]
end

Answer 3

It turns out it was a combination of Emu and Rich's answers. The form in the HTML is
<%= form_for #user, url: { action: "assign" } do |f| %>
<%= f.label :follower_id, "Assign #{#user.name} to" %>
<%= f.collection_select :following, #ders, :id, :name, prompt: true %>
<%= f.submit "Assign", class: "btn btn-primary" %>
<% end %>
With controller action
def assign
#scout = User.find(params[:id])
#der = User.find(params[:user][:following])
#scout.follow(#der)
redirect_to #scout
end
and routes as
Rails.application.routes.draw do
root 'static_pages#home'
get 'help' => 'static_pages#help'
get 'about' => 'static_pages#about'
get 'contact' => 'static_pages#contact'
get 'signup' => 'users#new'
get 'login' => 'sessions#new'
post 'login' => 'sessions#create'
delete 'logout' => 'sessions#destroy'
resources :users do
member do
get :following, :followers
match :assign, to: :assign, via: [:post, :patch]
end
end
resources :account_activations, only: [:edit]
resources :password_resets, only: [:new, :create, :edit, :update]
resources :relationships, only: [:create, :destroy]
end