Rails - How to delete associated attributes while updating a parent?

Question

I have two models namely Invoice and InvoiceDetails and:

class Invoice < ActiveRecord::Base

  has_many :invoice_details

Now an User has the ability to edit an invoice, so he can remove the invoiceDetails attributes from the invoice. So how can I delete those nested attributes of the invoiceDetails model while updating the invoice(parent) model.

I'm using AngularJS for client side.

The Update Action :

  def update
    invoice_id = params[:id]
    invoice = Invoice.find(invoice_id)
    if invoice.update(invoice_params)
      render json: invoice, status: 200
    else
      render json: { errors: invoice.errors }, status: 422
    end
  end

  def invoice_params
    invoice_params = params.require(:invoice).permit(:total_amount,:balance_amount, :customer_id, :totalTax, :totalDiscount, :bill_date,:company_id, { invoice_details: [:id,:invoice_id,:product_id,:quantity, :discount, :subtotal, :tax] })
    invoice_params[:invoiceDetails_attributes] = invoice_params.delete :invoice_details
    invoice_params.permit!
  end

The Invoice Model

class Invoice < ApplicationRecord
  has_many :invoiceDetails, inverse_of: :invoice, dependent: :destroy
  belongs_to :customer
  accepts_nested_attributes_for :invoiceDetails
end

The InvoiceDetails Model

class InvoiceDetail < ApplicationRecord
  belongs_to :invoice
  belongs_to :product
end

You need to pass _destroy parameter true or false for every InvoiceDetail object. — Vishal
– Vishal, Commented Jul 8, 2017 at 11:52

Paras · Accepted Answer · 2017-07-08 20:03:41Z

0

In case someone is stalled on this, here is what I did. I added an attribute is_hide in InvoiceDetails(child) model. When a user deletes an InvoiceDetails attribute, the is_hide property is set to true.

In the Invoice(parent) model, I used the before_save callback and iterated through the InvoiceDetails attributes and called mark_for_destruction where is_hide = true.

This is how my Invoice model looks :

class Invoice < ApplicationRecord
  has_many :invoiceDetails, inverse_of: :invoice, dependent: :destroy, autosave: true
  belongs_to :customer
  accepts_nested_attributes_for :invoiceDetails

  before_save :mark_children_for_removal

  def mark_children_for_removal
    invoiceDetails.each do |child|
      child.mark_for_destruction if child.is_hide?
    end
  end

end

answered Jul 8, 2017 at 20:03

Paras

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Comments

irruputuncu · Accepted Answer · 2020-06-20 07:51:00Z

0

By now (not sure since when actually) this feature is built in and you can just use the _destroy attribute. Make sure to allow it in your parameters and the just add a checkbox to the nested form:

<%= nested_form.check_box '_destroy' %>

This will then remove all marked items on update/saving.

See also this answer: https://stackoverflow.com/a/7151191/1595029

answered Jun 20, 2020 at 7:51

irruputuncu

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