Rails nested attributes are not saving - ruby-on-rails

Question

I am new to rails and am learning to complete an Inventory System database project for school.
Here is my Item model:
class Item < ActiveRecord::Base
self.primary_key ='item_id'
validates :item_id, :presence => true
has_one :vendor_item, :dependent => :destroy
has_one :vendor, :through => :vendor_item
accepts_nested_attributes_for :vendor_item
end
Here is my item controller:
class ItemsController < ApplicationController
def new
#item = Item.new
#all_vendors = Vendor.all
#item_vendor = #item.build_vendor_item
end
def create
#item = Item.new(item_params)
vendor = params[:vendors][:id]
#item_vendor = #item.build_vendor_item(:vendor_id => vendor)
#item_vendor.save
#raise params.inspect
if #item.save
redirect_to #item
else
render 'new'
end
end
def show
#item = Item.find(params[:id])
#item_vendor = #item.vendor_item
end
def index
#items = Item.all
end
def priceUnder500
#priceUnder500 = Item.where("price < ?", 500)
respond_to do |format|
format.html
format.js
end
end
def priceOver500
#priceOver500 = Item.where("price > ?", 500)
respond_to do |format|
format.html
format.js
end
end
def edit
#item = Item.find(params[:id])
#all_vendors = Vendor.all
#vendor_item = #item.vendor_item
end
def update
#item = Item.find(params[:id])
vendor = params[:vendors][:id]
if #item.vendor_item.blank?
#item.build_vendor_item(:vendor_id => vendor)
end
if #item.update(params[:item].permit(:item_id, :name, :category, :description, :reorder_level, :quantity, :price, :vendor_item_attributes => [:vendor_item_id]))
redirect_to items_path
else
render 'edit'
end
end
def destroy
#item = Item.find(params[:id])
#item.destroy
redirect_to items_path
end
private
def item_params
params.require(:item).permit(:item_id, :name, :category, :description, :reorder_level, :quantity, :price, :vendor_item_attributes => [:vendor_item_id])
end
end
And my _form partial for items:
<%= form_for #item do |f| %>
<% if #item.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#item.errors.count, "error") %> prohibited
this post from being saved:</h2>
<ul>
<% #item.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<p>
<%= f.label :item_id, 'Item Id' %><br>
<%= f.text_field :item_id %>
</p>
<%= fields_for #item_vendor do |vii| %>
<div class= "vendorItemId">
<%= vii.label :vendor_item_id%>
<%= vii.text_field :vendor_item_id%><br>
</div>
<% end %>
<p>
<%= f.label :name %><br>
<%= f.text_field :name %>
</p>
<p>
<%= f.label :category %><br>
<%= f.text_field :category %>
</p>
<p>
<%= f.label :description %><br>
<%= f.text_area :description %>
</p>
<p>
<%= f.label :reorder_level %><br>
<%= f.text_field :reorder_level %>
</p>
<p>
<%= f.label :quantity %><br>
<%= f.text_field :quantity %>
</p>
<p>
<%= f.label :price %><br>
<%= f.text_field :price %>
</p>
<h3>Vendors:</h3>
<%= fields_for(#item_vendor) do |ab| %>
<div class= "field">
<%= ab.label "All Vendors:" %><br>
<%= collection_select(:vendors, :id, #all_vendors, :id, :name, {},{:multiple => false})%>
</div>
<% end %>
<p>
<%= f.submit %>
</p>
<% end %>
vendor_item contains a reference to item_id, vendor_id, and has another attribute of vendor_item_id. When the program saves, item_id and vendor_id save but vendor_item_id does not save. I have tried every online source but cannot seem to get that one attribute to save. I am using rails 4. Thanks in advance for any help provided.

Answer 1

You haven't saving the result in an instance variable in create action.
Try giving like this in your create action.
def create
#item = Item.new(item_params)
vendor = params[:vendors][:id]
#item_vendor = #item.build_vendor_item(:vendor_id => vendor)
if #item.save
redirect_to #item
else
render 'new'
end
end

Answer 2

def create
#item = Item.new(item_params)
#vendor = params["item"]["vendors"]
if #item.save
#item.create_vendor_item(#vendor.id => vendor).save
redirect_to #item
else
render 'new'
end
end