Question

I have a two models, Items and Images. Under image model belongs_to :item and the item model has:many :images.

The image model has an item_id attribute.

Under the Items viewer I’m trying to display the images associated with each item. So for example I’d like to display image with item_id 1000 mapping onto Item with ID 1000.

I get a Couldn’t find Image with an ID error.

The Viewer looks like this:

<h1>Listing items - temporary testing page</h1>

<table>
  <tr>
    <th>Brand</th>
    <th>Item title</th>
    <th>Description</th>
    <th>Image link</th>
    <th></th>
    <th></th>
    <th></th>
  </tr>

<% @items.each do |item| %>
  <tr>
    <td><%= item.brand %></td>
    <td><%= item.item_title %></td>
    <td><%= item.description %></td>
    <td><%= item.image_id %></td>
    <td><%= image_tag @findimages.small_img %></td>
    <td><%= link_to 'Show', item %></td>
    <td><%= link_to 'Edit', edit_item_path(item) %></td>
    <td><%= link_to 'Destroy', item, method: :delete, data: { confirm: 'Are you sure?' }     %></td>
  </tr>
<% end %>
</table>

<br />

<%= link_to 'New Item', new_item_path %>

The Items Controller like this:

class ItemsController < ApplicationController
  # GET /items
  # GET /items.json
  def index
    @items = Item.all(params[:id])
    @findimages = Image.find(params[:item_id])

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @items }
    end
  end
.
.
.

Help for a noob would be appreciated!

Answer 1

So it seems like there is no image with params[:item_id]

1. use @findimages = Image.find(params[:item_id]) if params[:item_id]
2. use validates_presence_of :item_id in image.rb
3. Item.all(params[:id]) – wrong
   Item.find(params[:id]) of Item.all

4. You are using :item_id – thats right. Next you shoud use has_one :image in item.rb and belongs_to :item in image.rb. so your code will looks like:

   def index  
     @items = Item.all
   

and in view

<td><%= image_tag item.image.small_img %></td>

UPD: enter rails console and ensure that all images has an item_id by:

Image.where(:item_id => nil)

UPD2: Do not use pgadmin with rails, rails – best database administration tool.