Rails heroku ActionView::Template::Error (undefined method `author'

Question

This works locally, but not in heroku.

I have tried migrating locally, then pushing to heroku it did not work. I have tried heroku run rake db:migrate, then restarting it did not work.

I have tried to restart the dyno, it also did not work.

Is there something I can check which would give more detail? I was looking at heroku run rake db:migrate:status, but it only shows the general migration create books.

Error:

 2017-09-20T21:31:06.432739+00:00 app[web.1]: I, [2017-09-20T21:31:06.432588 #4]  INFO -- : [f953f5f7-3cab-45a4-9f97-2cd7004e2807] Started GET "/books" for 81.106.178.87 at 2017-09-20 21:31:06 +0000
2017-09-20T21:31:06.441798+00:00 app[web.1]: I, [2017-09-20T21:31:06.441609 #4]  INFO -- : [f953f5f7-3cab-45a4-9f97-2cd7004e2807]   Rendering books/index.html.erb within layouts/application
2017-09-20T21:31:06.435519+00:00 app[web.1]: I, [2017-09-20T21:31:06.435371 #4]  INFO -- : [f953f5f7-3cab-45a4-9f97-2cd7004e2807] Processing by BooksController#index as HTML
2017-09-20T21:31:06.487993+00:00 app[web.1]: D, [2017-09-20T21:31:06.487768 #4] DEBUG -- : [f953f5f7-3cab-45a4-9f97-2cd7004e2807]   Book Load (4.1ms)  SELECT "books".* FROM "books"
2017-09-20T21:31:06.549929+00:00 app[web.1]: I, [2017-09-20T21:31:06.549786 #4]  INFO -- : [f953f5f7-3cab-45a4-9f97-2cd7004e2807]   Rendered books/index.html.erb within layouts/application (107.8ms)
2017-09-20T21:31:06.550338+00:00 app[web.1]: I, [2017-09-20T21:31:06.550261 #4]  INFO -- : [f953f5f7-3cab-45a4-9f97-2cd7004e2807] Completed 500 Internal Server Error in 115ms (ActiveRecord: 22.9ms)
2017-09-20T21:31:06.552408+00:00 app[web.1]: F, [2017-09-20T21:31:06.552334 #4] FATAL -- : [f953f5f7-3cab-45a4-9f97-2cd7004e2807]   
2017-09-20T21:31:06.552538+00:00 app[web.1]: F, [2017-09-20T21:31:06.552475 #4] FATAL -- : [f953f5f7-3cab-45a4-9f97-2cd7004e2807] ActionView::Template::Error (undefined method `author' for #<Book:0x00000003849768>):
2017-09-20T21:31:06.552872+00:00 app[web.1]: [f953f5f7-3cab-45a4-9f97-2cd7004e2807]     24:         <tr>
2017-09-20T21:31:06.552875+00:00 app[web.1]: [f953f5f7-3cab-45a4-9f97-2cd7004e2807]     27:             <td><%=  image_tag book.image_url.to_s%></td>
2017-09-20T21:31:06.552870+00:00 app[web.1]: F, [2017-09-20T21:31:06.552781 #4] FATAL -- : [f953f5f7-3cab-45a4-9f97-2cd7004e2807]     23:       <% @books.each do |book| %>
2017-09-20T21:31:06.552873+00:00 app[web.1]: [f953f5f7-3cab-45a4-9f97-2cd7004e2807]     25:             <td><%= book.name %></td>
2017-09-20T21:31:06.552874+00:00 app[web.1]: [f953f5f7-3cab-45a4-9f97-2cd7004e2807]     26:             <td><%= book.author %></td>
2017-09-20T21:31:06.552876+00:00 app[web.1]: [f953f5f7-3cab-45a4-9f97-2cd7004e2807]     28:             <td><%= link_to "Свали Книга", book.attachment_url %></td>
2017-09-20T21:31:06.552881+00:00 app[web.1]: [f953f5f7-3cab-45a4-9f97-2cd7004e2807]     29:             <td><%= button_to "Delete", book, method: :delete, class: "btn btn-danger", confirm: "Сигурни ли сте, че желаете да изтриете #{book.name}?" %></td>
2017-09-20T21:31:06.552931+00:00 app[web.1]: F, [2017-09-20T21:31:06.552862 #4] FATAL -- : [f953f5f7-3cab-45a4-9f97-2cd7004e2807]   
2017-09-20T21:31:06.553046+00:00 app[web.1]: F, [2017-09-20T21:31:06.552958 #4] FATAL -- : [f953f5f7-3cab-45a4-9f97-2cd7004e2807] app/views/books/index.html.erb:26:in `block in _app_views_books_index_html_erb__879124352395591768_27663240'
2017-09-20T21:31:06.553047+00:00 app[web.1]: [f953f5f7-3cab-45a4-9f97-2cd7004e2807] app/views/books/index.html.erb:23:in `_app_views_books_index_html_erb__879124352395591768_27663240'

db/migrate/create_books

class CreateBooks < ActiveRecord::Migration[5.1]
  def change
    create_table :books do |t|
      t.string :name
      t.string :author
      t.string :image
      t.string :attachment

      t.timestamps
    end
  end
end

schema.rb

ActiveRecord::Schema.define(version: 20170920131113) do

  create_table "books", force: :cascade do |t|
    t.string "name"
    t.string "author"
    t.string "image"
    t.string "attachment"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  create_table "users", force: :cascade do |t|
    t.string "name"
    t.string "email"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

end

books/index.html.erb

<% if !flash[:notice].blank? %>
    <div class="alert alert-info">
        <%= flash[:notice] %>
    </div>
<%end%>

<br />

<%= link_to "Нова Книга", new_book_path, class: "btn btn-primary mb1 bg-blue" %>
<br />
<br />
<table class="table table-boarded table-striped">
    <thread>
        <tr>
            <th>Име</th>
            <th>Aвтор</th>
            <th>Корица</th>
            <th>Линк за сваляне</th>
            <th>&nbsp;</th>
        </tr>
    </thread>
    <tbody>
        <% @books.each do |book| %>
        <tr>
            <td><%= book.name %></td>
            <td><%= book.author %></td>
            <td><%=  image_tag book.image_url.to_s%></td>
            <td><%= link_to "Свали Книга", book.attachment_url %></td>
            <td><%= button_to "Delete", book, method: :delete, class: "btn btn-danger", confirm: "Сигурни ли сте, че желаете да изтриете #{book.name}?" %></td>
        </tr>
        <% end %>
    </tbody>
</table>

controllers/books_controller.rb

class BooksController < ApplicationController
  def index
    @books = Book.all
  end

  def new
    @book = Book.new
  end 

  def create
    @book = Book.new(book_params)

    if @book.save
        redirect_to books_path, notice: "Kнигата '#{@book.name}' е качена успешно!"
    else
        render 'new'
    end
  end

  def destroy
    @book = Book.find(params[:id])

    @book.destroy

    redirect_to books_path, notice: "Книгата е изтрита!"
  end

  private

  def book_params
    params.require(:book).permit(:name, :author, :image, :attachment)
  end

end

Answer 1

I was able to get it running, this was the answer that helped.

https://stackoverflow.com/a/32159297/7264254

Maybe you added the captcha column after originally running heroku run rake db:migrate the first time with that migration included? If that is the case, you need to reset the database (Please note that this will clear all the data) with

heroku pg:reset DATABASE and then migrate it again with

heroku run rake db:migrate After these the captcha should be available on Heroku too.