Error: has-many relationship in form, duplicate data when update - ruby-on-rails

Question

I am doing an e-commerce.
I have products which have many options of products and at the same time they only have one variant.
I try to make the view to create the product have the option of add a block where appears the fields of the model and the changes of the variant which is associated to it. The problem is, for example, when i create a product with 5 options, when i update it increases to 10, and if i update it again, there will be 20. I can't find the problem why they are duplicating. I leave the codes below.
Schema of Product, option-product and variant
create_table "options_products", force: :cascade do |t|
t.integer "product_id"
t.float "price"
t.integer "stock"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "products", force: :cascade do |t|
t.string "name", default: "", null: false
t.text "description"
t.integer "category_id"
t.integer "vendor_id"
t.string "state", null: false
t.boolean "shippingInside", null: false
t.datetime "created_at"
t.datetime "updated_at"
t.integer "priceComparison"
t.string "image1_file_name"
t.string "image1_content_type"
t.integer "image1_file_size"
t.datetime "image1_updated_at"
t.float "price"
end
create_table "variants", force: :cascade do |t|
t.string "tipoVariant"
t.integer "options_product_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.boolean "controlStock"
t.string "image_file_name"
t.string "image_content_type"
t.integer "image_file_size"
t.datetime "image_updated_at"
end
Script for add and remove fields
$(document).on 'ready page:load', ->
$('form').on 'click', '.remove_field', (event) ->
$(this).prev('input[type=hidden]').val('1')
$(this).closest('fieldset').hide()
event.preventDefault()
$('form').on 'click', '.add_field', (event) ->
time = new Date().getTime()
regular_expression = new RegExp($(this).data('id'), 'g')
$(this).before($(this).data('fields').replace(regular_expression,time))
event.preventDefault()
Product create and update
def create
#product = Product.new(product_params)
respond_to do |format|
if #product.save
format.html { redirect_to #product}
format.json { render :show, status: :created, location: #product }
else
format.html { render :new }
format.json { render json: #product.errors, status: :unprocessable_entity }
end
end
end
def update
respond_to do |format|
if #product.update(product_params)
format.html { redirect_to #product}
format.json { render :show, status: :ok, location: #product }
else
format.html { render :edit }
format.json { render json: #product.errors, status: :unprocessable_entity }
end
end
end
Product Params
def product_params
params.require(:product).permit(:name, :description, :state, :shippingInside, :vendor_id, :category_id, :priceComparison, :image1, :price, offer_attributes: [:status], options_products_attributes: [:price, :stock, variant_attributes: [:tipoVariant, :controlStock, :image]])
function in application helper to add association
def link_to_add_association(name, field, association)
new_object = field.object.send(association).klass.new
new_object_id = new_object.object_id
fields = field.fields_for(association, new_object, child_index: new_object_id) do |builder|
new_object.build_variant
render(association.to_s.singularize + '_field', f: builder)
end
link_to(name, '#', class: 'add_field', data: { id: new_object_id, fields: fields.gsub("\n", "") })
end
Product model
class Product < ActiveRecord::Base
#relations
belongs_to :category
belongs_to :vendor
has_one :offer, :dependent => :destroy
has_many :options_products, :dependent => :destroy
#accepts
accepts_nested_attributes_for :offer, allow_destroy: true
accepts_nested_attributes_for :options_products, allow_destroy: true
#validations
validates :name, presence:true
validates :name, uniqueness:true
validates :state, presence:true
validates :category_id, presence:true
validates :vendor_id, presence:true
has_attached_file :image1, styles: {medium: "300x300>", thumb: "150x150#" }
validates_attachment_content_type :image1, content_type: /\Aimage\/.*\z/
end
Option Product Model
class OptionsProduct < ActiveRecord::Base
belongs_to :product
has_one :variant, :dependent => :destroy
accepts_nested_attributes_for :variant, allow_destroy: true
end
Variant model
class Variant < ActiveRecord::Base
belongs_to :options_product
has_attached_file :image,
styles: {medium: "300x300>", thumb: "150x150#" }
validates_attachment_content_type :image,
content_type: /\Aimage\/.*\z/
end
_form of Product
= form_for #product, html: { multipart: true } do |f|
.row
.form-group.col-lg-6
.field
= f.file_field :image1
.row
.form-group.col-lg-6
.field
= f.text_field :name, :placeholder => 'Nombre', :class => 'form-control input-border-left'
.row
.form-group.col-lg-6
.field
= f.text_area :description, :placeholder => 'Descripcion', :class => 'form-control input-border-left'
.row
.form-group.col-lg-6
.field
= f.number_field :price, :placeholder => 'Precio a mostrar', :class => 'form-control input-border-left'
.row
.form-group.col-lg-6
.field
= f.label :Estado
%br/
= f.select :state, options_for_select(['Disponible', 'No disponible'])
.row
.form-group.col-lg-6
.field
= f.label :Envio
%br/
= f.check_box :shippingInside
.row
.form-group.col-lg-6
.field
= f.text_field :priceComparison, :placeholder => 'Precio anterior', :class => 'form-control input-border-left'
.row
.form-group.col-lg-6
.field
= f.label :vendor_id
%br/
= f.select :vendor_id, Vendor.all.collect { |vendor| [vendor.name, vendor.id] }
.row
.form-group.col-lg-6
.field
= f.label :category_id
%br/
= f.select :category_id, Category.all.collect { |category| [category.name, category.id] }
= f.fields_for :offer, #product.build_offer do |o|
= o.label :Oferta
%br/
= o.check_box :status
%br/
.row
= f.fields_for :options_products do |op|
= render 'options_product_field', f: op
= link_to_add_association 'Agregar variante', f, :options_products
%br/
.actions
= f.submit "Enviar", :class => 'button btn btn-primary bold'
options_product_field file
%fieldset
.row
.form-group.col-lg-6
.field
= f.text_field :price, :placeholder => 'Precio', :class => 'form-control input-border-left'
.row
.form-group.col-lg-6
.field
= f.text_field :stock, :placeholder => 'Stock', :class => 'form-control input-border-left'
= f.fields_for :variant do |v|
.row
.form-group.col-lg-6
.field
= v.text_field :tipoVariant, :placeholder => 'Tipo de variante', :class => 'form-control input-border-left'
.row
.form-group.col-lg-6
.field
= v.label :ControlarStock
%br/
= v.check_box :controlStock
.row
.form-group.col-lg-6
.field
= v.label :ImagenDeVariante
%br/
= v.file_field :image
= f.hidden_field :_destroy
= link_to 'Remover variante', '#', class: 'remove_field'

Answer 1

In product_params, you should specify id of options_products_attributes. Without id, attributes will be newly added to product model.
So, try
... options_products_attributes: [ :id, price, :stock, variant_attributes: [ :id, :tipoVariant, ...