Rails: Routing Error: No route matches [PATCH] "/things" - ruby-on-rails

Question

I created an edit form for my model "Things", but when I submit the form, it returns the error "No route matches [PATCH] "/things"". The weird thing is, the url of the error is http://localhost:3000/things, but I was expecting it to be http://localhost:3000/things/:id, because I wrote redirect_to #thing under the create function. I just defined all my Thing routes with resources :things, so it should have the update path defined. What am I doing wrong?
things_controller:
class ThingsController < ApplicationController
def show
#thing = Thing.find(params[:id])
#category_things = CategoryThing.all
#thing.categories.build
#thing.things.build
#related_things = RelatedThing.all
end
def index
end
def new
#thing = Thing.new
#things = Thing.all
end
def create
#thing = Thing.new(thing_params)
if #thing.save
redirect_to #thing
else
render 'new'
end
end
def edit
#thing = Thing.find(params[:id])
end
def update
#thing = Thing.find(params[:id])
if #thing.update_attributes(thing_params)
flash[:success] = "Thing updated"
redirect_to #thing
else
render 'edit'
end
end
private
def thing_params
params.require(:thing).permit(:name, :image_path, :avatar)
end
end
things/edit.html.erb:
<h1>Edit <%= #thing.name %></h1>
<p>
<%= form_for #thing, :url => things_path, :html => { :multipart => true } do |f| %>
<%= f.text_field :name, :placeholder => "Name of the thing" %>
<br>
<%= f.label :categories_the_thing_belongs_to %>
<%= f.collection_select :categories, Category.all, :id, :name %>
<br>
<%= f.label :related_things %>
<%= f.collection_select :related_things, Thing.all, :id, :name %>
<br>
<%= f.label :display_picture %>
<%= f.file_field :avatar %>
<br>
<%= f.submit "Submit", class: "btn btn-primary" %>
<% end %>
</p>
Output of rake routes
Prefix Verb URI Pattern Controller#Action
ratings_new GET /ratings/new(.:format) ratings#new
down_votes_new GET /down_votes/new(.:format) down_votes#new
thing_new GET /thing/new(.:format) thing#new
good_comments_new GET /good_comments/new(.:format) good_comments#new
good_comments_show GET /good_comments/show(.:format) good_comments#show
bad_comments_new GET /bad_comments/new(.:format) bad_comments#new
related_things_new GET /related_things/new(.:format) related_things#new
things_new GET /things/new(.:format) things#new
category_things_new GET /category_things/new(.:format) category_things#new
thing_ratings_new GET /thing_ratings/new(.:format) thing_ratings#new
category_ratings_new GET /category_ratings/new(.:format) category_ratings#new
subjects GET /subjects(.:format) subjects#index
POST /subjects(.:format) subjects#create
new_subject GET /subjects/new(.:format) subjects#new
edit_subject GET /subjects/:id/edit(.:format) subjects#edit
subject GET /subjects/:id(.:format) subjects#show
PATCH /subjects/:id(.:format) subjects#update
PUT /subjects/:id(.:format) subjects#update
DELETE /subjects/:id(.:format) subjects#destroy
subjects_show GET /subjects/show(.:format) subjects#show
subject_things_new GET /subject_things/new(.:format) subject_things#new
categories GET /categories(.:format) categories#index
POST /categories(.:format) categories#create
new_category GET /categories/new(.:format) categories#new
edit_category GET /categories/:id/edit(.:format) categories#edit
category GET /categories/:id(.:format) categories#show
PATCH /categories/:id(.:format) categories#update
PUT /categories/:id(.:format) categories#update
DELETE /categories/:id(.:format) categories#destroy
categories_results GET /categories/results(.:format) categories#results
subjects_new GET /subjects/new(.:format) subjects#new
root GET / home_page#home
all_things_new GET /all/things/new(.:format) things#new
all_allthings GET /all/allthings(.:format) all#allthings
thing_good_comments GET /things/:thing_id/good_comments(.:format) good_comments#index
POST /things/:thing_id/good_comments(.:format) good_comments#create
new_thing_good_comment GET /things/:thing_id/good_comments/new(.:format) good_comments#new
edit_thing_good_comment GET /things/:thing_id/good_comments/:id/edit(.:format) good_comments#edit
thing_good_comment GET /things/:thing_id/good_comments/:id(.:format) good_comments#show
PATCH /things/:thing_id/good_comments/:id(.:format) good_comments#update
PUT /things/:thing_id/good_comments/:id(.:format) good_comments#update
DELETE /things/:thing_id/good_comments/:id(.:format) good_comments#destroy
thing_bad_comments GET /things/:thing_id/bad_comments(.:format) bad_comments#index
POST /things/:thing_id/bad_comments(.:format) bad_comments#create
new_thing_bad_comment GET /things/:thing_id/bad_comments/new(.:format) bad_comments#new
edit_thing_bad_comment GET /things/:thing_id/bad_comments/:id/edit(.:format) bad_comments#edit
thing_bad_comment GET /things/:thing_id/bad_comments/:id(.:format) bad_comments#show
PATCH /things/:thing_id/bad_comments/:id(.:format) bad_comments#update
PUT /things/:thing_id/bad_comments/:id(.:format) bad_comments#update
DELETE /things/:thing_id/bad_comments/:id(.:format) bad_comments#destroy
thing_ratings GET /things/:thing_id/ratings(.:format) ratings#index
POST /things/:thing_id/ratings(.:format) ratings#create
new_thing_rating GET /things/:thing_id/ratings/new(.:format) ratings#new
edit_thing_rating GET /things/:thing_id/ratings/:id/edit(.:format) ratings#edit
thing_rating GET /things/:thing_id/ratings/:id(.:format) ratings#show
PATCH /things/:thing_id/ratings/:id(.:format) ratings#update
PUT /things/:thing_id/ratings/:id(.:format) ratings#update
DELETE /things/:thing_id/ratings/:id(.:format) ratings#destroy
thing_up_votes GET /things/:thing_id/up_votes(.:format) up_votes#index
POST /things/:thing_id/up_votes(.:format) up_votes#create
new_thing_up_vote GET /things/:thing_id/up_votes/new(.:format) up_votes#new
edit_thing_up_vote GET /things/:thing_id/up_votes/:id/edit(.:format) up_votes#edit
thing_up_vote GET /things/:thing_id/up_votes/:id(.:format) up_votes#show
PATCH /things/:thing_id/up_votes/:id(.:format) up_votes#update
PUT /things/:thing_id/up_votes/:id(.:format) up_votes#update
DELETE /things/:thing_id/up_votes/:id(.:format) up_votes#destroy
things GET /things(.:format) things#index
POST /things(.:format) things#create
new_thing GET /things/new(.:format) things#new
edit_thing GET /things/:id/edit(.:format) things#edit
thing GET /things/:id(.:format) things#show
PATCH /things/:id(.:format) things#update
PUT /things/:id(.:format) things#update
DELETE /things/:id(.:format) things#destroy
things_show GET /things/show(.:format) things#show
things_results GET /things/results(.:format) things#results
things_random GET /things/random(.:format) things#random
web_console /console WebConsole::Engine
Routes for WebConsole::Engine:
root GET / web_console/console_sessions#index
input_console_session PUT /console_sessions/:id/input(.:format) web_console/console_sessions#input
pending_output_console_session GET /console_sessions/:id/pending_output(.:format) web_console/console_sessions#pending_output
configuration_console_session PUT /console_sessions/:id/configuration(.:format) web_console/console_sessions#configuration
console_sessions GET /console_sessions(.:format) web_console/console_sessions#index
POST /console_sessions(.:format) web_console/console_sessions#create
new_console_session GET /console_sessions/new(.:format) web_console/console_sessions#new
edit_console_session GET /console_sessions/:id/edit(.:format) web_console/console_sessions#edit
console_session GET /console_sessions/:id(.:format) web_console/console_sessions#show
PATCH /console_sessions/:id(.:format) web_console/console_sessions#update
PUT /console_sessions/:id(.:format) web_console/console_sessions#update
DELETE /console_sessions/:id(.:format) web_console/console_sessions#destroy

Answer 1

just remove the :url => things_path and use:
<%= form_for #thing, :html => { :multipart => true } do |f| %>
The form_for helper automatically generates the proper resfull endpoint if using ressourcefull routes.
Depending on #thing being persisted? or a new_record? it the endpoint will be :create or :update