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Ruby Build a Todo List Application with Rails 4 Build a Todo List Application with Rails 4 Viewing Todo Items: Part 2

umar razzaq
umar razzaq
714 Points
Posted by umar razzaq
umar razzaq
714 Points

Statement Invalid Error

I get the following error:

SQLite3::SQLException: no such column: todo_items.todo_list_id: SELECT "todo_items".* FROM "todo_items" WHERE "todo_items"."todo_list_id" = ?

For the following piece of code:

<ul class="todo_items"> <% @todo_list.todo_items.each do |todo_item| %> <li><%= todo_item.content %></li> <% end %> </ul>

4 Answers

umar razzaq
umar razzaq
714 Points
umar razzaq
umar razzaq
714 Points

The code didn't show up so I'll add it here:

<ul class="todo_items">
  <% @todo_list.todo_items.each do |todo_item| %>
  <li><%= todo_item.content %></li>
  <% end %>
</ul>
Steve Hunter
Steve Hunter
57,712 Points
Steve Hunter
Steve Hunter
57,712 Points

Can you list the full error, or is that it? And that code snippet is in todo_items/index.html.erb, right?

umar razzaq
umar razzaq
714 Points
umar razzaq
umar razzaq
714 Points

Yep the code is in index.html.erb, I've added a screenshot here: 

http://imgur.com/gXKCEAw
Steve Hunter
Steve Hunter
57,712 Points

Can you post the rest of the code in that file - I can't see why the id is either causing a problem, or present!

Steve Hunter
Steve Hunter
57,712 Points

Can you also post the contents of your db/schema.rb file, please? I may be barking up the wrong tree here, but the error is SQL-based, in part.

umar razzaq
umar razzaq
714 Points
umar razzaq
umar razzaq
714 Points

Ok,

The schema,

ActiveRecord::Schema.define(version: 20151116030134) do

  create_table "todo_items", force: :cascade do |t|
    t.integer  "todo_lists_id"
    t.string   "content"
    t.datetime "created_at",    null: false
    t.datetime "updated_at",    null: false
  end

  add_index "todo_items", ["todo_lists_id"], name: "index_todo_items_on_todo_lists_id"

  create_table "todo_lists", force: :cascade do |t|
    t.string   "title"
    t.text     "description"
    t.datetime "created_at",  null: false
    t.datetime "updated_at",  null: false
  end

end

The code for the page:

Showing Items for:
<h1><%= @todo_list.title %></h1>

<ul class="todo_items">
  <% @todo_list.todo_items.each do |todo_item| %>
  <li><%= todo_item.content %></li>
  <% end %>
</ul>

<%= link_to "New Todo Item" new_todo_list_todo_item_path %>
Steve Hunter
Steve Hunter
57,712 Points
Steve Hunter
Steve Hunter
57,712 Points

Aha!!

This:

schema.rb 
t.integer  "todo_lists_id"

should be:

schema.rb 
t.integer  "todo_list_id"

I think.

A todo_item exists in one todo_list - the relationship is belongs_to :todo_list. Do you have that in your models/todo_item.rb file?

When you migrated the database to create the todo_items table; what did that migration looks like? It should have something like:

migration.rb 
class CreateTodoItems < ActiveRecord::Migration
  def change
    create_table :todo_items do |t|
      t.references :todo_list, index: true, foreign_key: true    
.
.

What's yours got? (note the singular todo_list in that migration)