Rails shows wrong forum path - ruby-on-rails

Question

I made Forum model which belongs to Category and in show view of every category each forum from that category needs to be showed, but links are pointing at wrong paths (for example, in category 4 I have only one forum which points to category/1/forum/1 and category 1 doesn't even exist).
One more note: each category has it's position field (integer) and they're sorted with that field in ascending order. Category 4 have position 1, but why would that number be on the place of category id in url?
When I try to access /category/4/forum/1 I get the error "Couldn't find Category with 'id'=1"
CategoriesController
class CategoriesController < ApplicationController
def index
categories_ordered
end
def new
#category = Category.new
categories_ordered
end
def create
#category = Category.new(category_params)
categories_ordered
if #category.save
redirect_to forums_path, notice: "Kategorija je uspešno kreirana."
else
render "new"
end
end
def show
find_category
find_forums
end
def edit
find_category
end
def update
find_category
if #category.update(category_params)
redirect_to category_path(#category), notice: "Kategorija je uspešno ažurirana."
else
render "edit"
end
end
def destroy
find_category
#category.destroy
redirect_to forums_path, notice: "Kategorija je uspešno obrisana."
end
private
def category_params
params.require(:category).permit(:name, :description, :position)
end
def find_category
#category = Category.find(params[:id])
end
def find_forums
#forums = #category.forums.all
end
def categories_ordered
#categories = Category.all.order("position ASC")
end
end
ForumsController
class ForumsController < ApplicationController
def new
find_category
#forum = #category.forums.new
end
def create
#category = Category.find(params[:category_id])
#forum = #category.forums.create(forum_params)
if #forum.save
redirect_to category_path(#category), notice: "Forum je uspešno kreiran."
else
render "new"
end
end
def show
find_category
find_forum
end
def edit
find_category
find_forum
end
def update
find_category
find_forum
if #forum.update(forum_params)
redirect_to forum_path(#forum), notice: "Forum je uspešno ažuriran."
else
render "edit"
end
end
private
def forum_params
params.require(:forum).permit(:title, :description)
end
def find_category
#category = Category.find(params[:category_id])
end
def find_forum
#forum = #category.forums.find(params[:id])
end
end
categories#show
<% authorize %>
<h2><%= #category.name %></h2>
<p><%= #category.description %></p>
<div class="list-group">
<% #category.forums.each do |f| %>
<a href="<%= forum_path(f) %>" class="list-group-item">
<h4 class="list-group-heading"><%= f.title %></h4>
<p class="list-group-text">
<%= f.description %>
</p>
</a>
<% end %>
</div>
<% if is_admin? %>
<%= link_to new_forum_path, class: "btn btn-primary" do %>
<span class="glyphicon glyphicon-plus"></span> Dodaj forum
<% end %>
<%= link_to edit_category_path(#category), class: "btn btn-primary" do %>
<span class="glyphicon glyphicon-pencil"></span> Izmeni
<% end %>
<%= link_to category_path(#category), class: "btn btn-danger", method: :delete, data: { confirm: "Da li ste sigurni da želite obrisati ovu kategoriju?" } do %>
<span class="glyphicon glyphicon-trash"></span> Obriši
<% end %>
<% end %>
routes.rb
Rails.application.routes.draw do
root "welcome#index"
get "start" => "welcome#index", as: "index"
get "registration" => "users#new", as: "register"
get "login" => "sessions#new", as: "login"
post "login" => "sessions#create"
get "logout" => "sessions#destroy", as: "logout"
get "users" => "users#index", as: "users"
post "users" => "users#create"
get "profile" => "users#show", as: "profile"
get "user/:id" => "users#show", as: "user"
get "user/:id/edit" => "users#edit", as: "edit_user"
patch "user/:id" => "users#update"
delete "user/:id" => "users#destroy"
get "categories/add" => "categories#new", as: "new_category"
get "category/:id" => "categories#show", as: "category"
patch "category/:id" => "categories#update"
delete "category/:id" => "categories#destroy"
get "category/:id/edit" => "categories#edit", as: "edit_category"
get "terms" => "welcome#terms", as: "terms"
get "wh" => "bugs#new", as: "wh"
get "bugs" => "bugs#index", as: "bugs"
post "bugs" => "bugs#create"
get "bug/:id" => "bugs#show", as: "bug"
delete "bug/:id" => "bugs#destroy"
get "forum" => "categories#index", as: "forums"
get "category/:category_id/forum/add" => "forums#new", as: "new_forum"
get "category/:category_id/forum/:id" => "forums#show", as: "forum"
get "category/:category_id/forum/:id/edit" => "forums#edit", as: "edit_forum"
patch "category/:category_id/forum/:id" => "forums#update"
delete "category/:category_id/forum/:id" => "forums#destroy"
resources :users
resources :sessions
resources :categories do
resources :forums
end
resources :bugs
# For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end

Answer 1

Error is partially solved; I just had to use different parameters with ForumsController (category_id for categories and id for forums).
def find_category
#category = Category.find(params[:category_id])
end
def find_forum
#forum = #category.forum.find(params[:id])
end
And change forum routes accordingly.
It looks like problem still isn't solved. I changed this parts but I still have problems with URLs. Now category and forums IDs are mixed in url (instead of /category/4/forum/1 it shows /category/1/forum/4).
Edit: Problem is finally solved! This answer gave me an idea what I should do. I just had to specify #category with paths too (just changing two lines):
<div class="list-group">
<% #category.forums.each do |f| %>
<a href="<%= forum_path(#category, f) %>" class="list-group-item">
<h4 class="list-group-heading"><%= f.title %></h4>
<p class="list-group-text">
<%= f.description %>
</p>
</a>
<% end %>
</div>
<% if is_admin? %>
<%= link_to new_forum_path(#category), class: "btn btn-primary" do %>
<span class="glyphicon glyphicon-plus"></span> Dodaj forum
<% end %>