I doing a grocery website. Now i want to show the outletproduct details to product page and i have create a partial file which name as outletproductform.html.erb to put at the product show page. But it show the error to me, here is my code.

Product Controller

class ProductsController < ApplicationController

 def category
  @category = Category.find(params[:id])
 end

 def index
  @products = Product.all
 end

 def show
  @product = Product.find(params[:id])
  @outlet_product = OutletProduct.find(params[:id])
 end

 def new
  @product = Product.new
  @category = Category.all
 end

 def create
  @product = Product.new(product_params)
  @category_id = Category.all
  if @product.save
   flash[:success] = "Succesful create!"
   redirect_to @product
 else
   render 'new'
 end
end

 private

def product_params
  params.require(:product).permit(:name, :quantity, :price,
                                  :category_id, :cost)
end
end

show.html.erb

<% provide(:title, @product.name)%>

<%= render @product %>
<%= render @outletproductform %>
<div >
 <aside >
  <section >
   <%= render 'shared/stats' %>
  </section>
 <div>
   <%= link_to "Add to Outlet", new_outlet_product_path %>
   <%= link_to "Edit", edit_product_path %>
   <%= link_to "Back to products", products_path %>
 </div>
 </aside>
</div>

_outletproductform.html.erb

<div>
 <table >
  <thead>
    <tr>
     <th>Outlet</th>
     <th>Quantity</th>
     <th>Selling Price</th>
     <th>Last Cost</th>

    </tr>
 </thead>
 <tbody>
   <tr>
    <td><%= outlet_product.outlet.name %></td>
    <td><%= outlet_product.quantity %></td>
    <td><%= outlet_product.selling_price %></td>
    <td><%= outlet_product.last_cost %></td>
  </tr>

 </tbody>
</div>

OutletProduct migration table in schema

create_table "outlet_products", force: :cascade do |t|
t.integer "outlet_id"
t.integer "product_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.decimal "selling_price"
t.decimal "last_cost"
t.decimal "quantity"

end

error show in console

error show in website

CodePudding user response：

As stated in the comments, you are passing @outletproductform to the render method, but since you havent defined it, its nil, hence the error.

this works on the previous line because you have a valid object for @product and the render method is looking for a corresponding view file. (eg if you pass a list of products it will look for the index.html.erb view and so on)

Since you already have the right view file in the right location, views/products/_outletproductform, you just have to change this to be:

<%= render 'outletproductform' %>

Note that if you are looking for a partial that isnt located in the same folder (in this case products) you would need to reference the correct path, ie

<%= render 'some_model/some_partial' %>

here is the layout and rendering guide