How to work with array of dictionaries in mongoid?

Question

MongoDB

In the database (users collection), records are stored in the following form:

"_id" : ObjectId("some id"),
  "admin" : "Name",
  "items" : [
    {
      "name" : "some name,
      "img" : "some url",
      "price" : 3000,
      "cat" : "category name",
      "active" : "1",
      "id" : 1,
      "desc" : "description"
    },

#_form.html.erb

<%= form_for(@bot) do |f| %>
  <div class="container">
    <div class="form-group">
      <%= f.label "Условия доставки" %><br>
      <%= f.text_area :delivery_info, class: "form-control"  %>
    </div>
    <div class="form-group">
      <%= f.label "Email" %><br>
      <%= f.text_field :email, class: "form-control"  %>
    </div>
    <div class="form-group">
      <%= f.label "Контактная информация" %><br>
      <%= f.text_area :contacts_info, class: "form-control"  %>
    </div>
    
    <div class="field">
      <%= @bot.items.each do |item| %>
        <%= f.fields_for item do |i| %>
      <div class="field">
        <%= i.label :name %><br />
        <%= i.text_field :name %>
      </div
        <% end %>
      <% end %>
    </div>
    <div class="actions">
      <%= f.submit "Сохранить", class: 'btn btn-success'%>
    </div>
  </div>
<% end %>

#item.rb

class Item
  include Mongoid::Document
  embedded_in :bot
  field :name, type: String
  field :price, type: Integer
  field :cat, type: String
  field :desc, type: String
  field :img, type: String
end

#bot.rb

require 'digest/md5'
class Bot
  include Mongoid::Document
  store_in collection: 'bots'
  embeds_many :items
  field :admin, type: String
  field :delivery_info, type: String
  field :email, type: String
  field :contacts_info, type: String
  field :link, type: String
  field :token, type: String
end

There are no problems with displaying a list of items for a specific user, but it is not clear how to edit item.
UPD: when I try to update the name value of an item, I get the message
Processing by BotsController#update as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"token here==", "bot"=>{" delivery_info"=>"Pickup", "email"=>"email here", "contacts_info"=>"telegram", "item"=>{"name"=>"Coat"}}, "commit"=>" Save", "id"=>"5790edbe3993951addde4b23"}
Unpermitted parameter: item
That is, it tries to change the item attribute, while the Bot model object has only the items attribute. It's not clear how to fix it.

Answer 1

Decided by adding additional parameters to the controller.

Answer 2

https://docs.mongodb.com/manual/reference/operator...
https://docs.mongodb.com/manual/reference/operator...