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Editorial Team
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Asked: 2026-06-08T19:41:05+00:00

I am not sure how to create an event at all time but still

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I am not sure how to create an event at all time but still keeping data integrite correct.
Here are my models

Customer

  id
  first
  last
  email

Book

  id
  description

Book_Manager

  customer_id
  book_id
  visible

In order to do this I have to use a has_many relationship and his describe has below

Book
has_many :book_managers
    has_many :customers, :through => :book_managers
Book_Manager
    belongs_to :customer
    belongs_to :book
Customer
    has_many :book_managers
    has_many :books, :through => :book_managers

The idea is to see the data already created from previous time, which mean I would have to create a query where Book = Book_Manager Table where customer_id = current_customer and created_last. I am not to sure how would i create a query like this in the book controllers. I believe it may look like has follow for the query. I am correct? Current customer is the current customer in sessionHelper method

@report = BookManager where customer.id == current_customer.id AND created_last.last

Last but not least, everytime the customer modify the text by pressing save, The action create would be executed, and create a new book_manager with the correct 3th model books associated with and customer also associated with the book manager.

I have the following code but i am not sure if its correct

class BooksController < ApplicationController
    def edit
        @book = Book.find(params[:id])
    end

    def create
        @customer = Customer.first
        @book = @customer.BookManager.build(params[:book])
    end
end
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1 Answer

  1. Editorial Team
    Book
  has_many :book_managers
  has_many :books, :through => :book_managers

Book_Manager
  belongs_to :customer
  belongs_to :book

Customer
  has_many :book_managers
  has_many :customers, :through => :book_managers

   Book                Book_Manager          Customer
|-------------|       |-------------|       |---------|
| id          |-1---*-| book_id     |       | id      |
| description |       | customer_id |-*---1-| first   |
|             |       | id          |       | last    |
|             |       |             |       | email   |
|-------------|       |-------------|       |---------|

    As you have the have_many through you don’t need to refer the join table (Book_Manager). You can access it directly:

    @customer = Customer.first
@books = @customer.books #return all books
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