Rails simple_form_for No route matches, missing [:id] - ruby-on-rails

Question

Straight to the point, a bit confusing here
this is my code
routes.rb
Rails.application.routes.draw do
namespace :main, path: ':master_url' do
root 'sites#index'
namespace :dashboard do
root 'dashboards#index'
resources :masters
end
get "/:action" => 'sites#:action'
end
root 'main/sites#index'
end
rake routes
Prefix Verb URI Pattern Controller#Action
main_root GET /:master_url(.:format) main/sites#index
main_dashboard_root GET /:master_url/dashboard(.:format) main/dashboard/dashboards#index
main_dashboard_masters GET /:master_url/dashboard/masters(.:format) main/dashboard/masters#index
POST /:master_url/dashboard/masters(.:format) main/dashboard/masters#create
new_main_dashboard_master GET /:master_url/dashboard/masters/new(.:format) main/dashboard/masters#new
edit_main_dashboard_master GET /:master_url/dashboard/masters/:id/edit(.:format) main/dashboard/masters#edit
main_dashboard_master GET /:master_url/dashboard/masters/:id(.:format) main/dashboard/masters#show
PATCH /:master_url/dashboard/masters/:id(.:format) main/dashboard/masters#update
PUT /:master_url/dashboard/masters/:id(.:format) main/dashboard/masters#update
DELETE /:master_url/dashboard/masters/:id(.:format) main/dashboard/masters#destroy
main GET /:master_url/:action(.:format) main/sites#:action
root GET / main/sites#index
main/dashboard/masters_controller.rb
class Main::Dashboard::MastersController < ApplicationController
before_action :all_masters, only: [:index, :create, :update, :destroy]
before_action :set_master, only: [:edit, :update, :destroy, :show]
before_action :init_master
layout 'main'
respond_to :html, :js
def new
#master = Master.new
end
def create
#master = Master.create(conf_params)
end
def edit
end
def update
#master.update_attributes(conf_params)
end
def destroy
#master.destroy
end
private
def all_masters
#masters = Master.all
end
def set_master
#master = Master.find(params[:id])
end
def conf_params
params.require(:master).permit(:title,:url)
end
def init_master
#master_url = Master.find_by_url(params[:master_url])
end
end
this is what i did when partially render _form_master.html.erb , which i called on new.js.erb and edit.js.erb
$('#form-master').html("<%= j (render 'form_master', :master => #master) %>");
_form_master.html.erb contents
<%= simple_form_for [:main, :dashboard, #master], remote: true do |f| %>
<%= f.input :url, label: 'URL' %>
<%= f.input :title, label: 'Title' %>
<%= f.button :submit %>
<% end %>
PROBLEMS:
When i called new master, with this
<%= link_to new_main_dashboard_master_path, remote: true do %>
the page rendered flawlessly, and create master doing good
but when i called edit , with this line
<%= link_to :controller=>"masters",:action =>"edit",:id => master do %>
which was my problem earlier , rails returning an error with messages:
ActionView::Template::Error (No route matches {:action=>"show", :controller=>"main/dashboard/masters", :format=>nil, :id=>nil, :master_url=>#<Master id: 4, url: "test", title: "Test Aja", created_at: "2015-02-02 08:55:07", updated_at: "2015-02-02 08:55:07">} missing required keys: [:id]):
i am explicitly render values of master.id and master.title to the page, which is returning correct values.
Q: How do i fix this ? i was trying a couple of times, from changing the locals pass on js.erb, change the #model to just model, still not work
Any help are appreciated, thanks ! :)

Answer 1

Here we have post = Post.find(params[:post_id])
from http://blog.8thcolor.com/en/2011/08/nested-resources-with-independent-views-in-ruby-on-rails/
Don't you have anything like that for your model?
You need an :id of some kind don't you?
This may be out of context but I'm not going to try to reuse your code.
And it may be too simple to try something like
render plain: params[:someparam].inspect
but it helps me.
http://codefol.io/posts/Deep-Rails-Understanding-HashWithIndifferentAccess-Understanding-the-Params-Hash