Rails saving all my fields as nil - ruby-on-rails

Question

It creates the object, says that it was successfully created, but all fields are saved in the database with nil values. Only created_at and updated_at are saved normally.
Some methods of my controllers/admin/categories_controller.rb
def new
#admin_category = Category.new
end
# GET /admin/categories/1/edit
def edit
end
# POST /admin/categories
# POST /admin/categories.json
def create
#admin_category = Category.new(params[:category])
respond_to do |format|
if #admin_category.save
format.html { redirect_to admin_category_path(#admin_category), notice: 'Category was successfully created.' }
format.json { render :show, status: :created, location: admin_category_path(#admin_category) }
else
format.html { render :new }
format.json { render json: #admin_category.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /admin/categories/1
# PATCH/PUT /admin/categories/1.json
def update
respond_to do |format|
if #admin_category.update(admin_category_params)
format.html { redirect_to #admin_category, notice: 'Category was successfully updated.' }
format.json { render :show, status: :ok, location: #admin_category }
else
format.html { render :edit }
format.json { render json: #admin_category.errors, status: :unprocessable_entity }
end
end
end
This is my models/category model:
class Category < ActiveRecord::Base
belongs_to :category
end
This is my routes.br file
namespace :admin do
resources :categories
end
My views/admin/categories/_form.html.erb
<%= form_for(#admin_category, url: admin_categories_path) do |f| %>
<% if #admin_category.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#admin_category.errors.count, "error") %> prohibited this admin_category from being saved:</h2>
<ul>
<% #admin_category.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :is_active %><br>
<%= f.check_box :is_active %>
</div>
<div class="field">
<%= f.label :main_menu %><br>
<%= f.check_box :main_menu %>
</div>
<div class="field">
<%= f.label :category_id %><br>
<%= f.number_field :category_id %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
And when I try to edit, I get this error:
No route matches [PATCH] "/admin/categories"
I'm very newbie to Ruby on Rails, so I would apreciate any help!
Thanks!

Answer 1

You are only passing :category when creating a new Category:
def create
#admin_category = Category.new(params[:category])
Change it to Category.new(user_params) and try again. This will pass on all parameters you're creating and feed it to the database.
Also, permit the parameters you are trying to pass:
def user_params
params.require(:admin_category).permit(:name, :is_active, :main_menu, :category_id)
end

Answer 2

Strong Params:
#app/controllers/categories_controller.rb
class CategoriesController < ApplicationController
def create
#admin_category = Category.new category_params
end
private
def category_params
params.require(:category).permit(:name, :is_active, :main_menu, :category_id)
end
end
--
As a tip, if you're using nested objects with forms, you can pass both objects in an array to create the nested path:
#app/views/admin/categories/new.html.erb
<%= form_for [:admin, #admin_category] do |f| %>