Question

I see numerous posts regarding issues with deploying to Heroku, but I haven’t been able to find the solution for my case. Any input would be much appreciated.

I have a blogging application that runs fine locally. However, I am returning “I’m sorry, but something went wrong” when I deploy to Heroku.

The gems I have are:

group :development do
  gem 'sqlite3', '1.3.5'
end

group :production do
  gem 'pg', '0.12.2'
end

The steps I’ve taken are:

git add.
git commit -am "latest update"
git push
git push heroku
rake db:migrate
heroku run rake db:migrate

My SQLite3 database is migrating fine, as I can find my latest blog entry (Blog.find(21)) through rails console.
However, the data does not seem to be migrating to the Heroku database, as the Heroku console returns

"ActiveRecord::RecordNotFound: Couldn't find Blog with id=21."

Additionally, “heroku logs” finds:

Completed 500 Internal Server Error in 50ms
NoMethod Error (undefined method 'blogs' for nil:NilClass):
  app/controllers/static_pages_controller.rb:8:in 'home'

Does this mean there could be an issue in my static_pages_controller, or is it just returning an error because the database is not migrating correctly?

Below is my static_pages controller, which works fine on my local server.

class StaticPagesController < ApplicationController
  def home
    if signed_in?
      @blog = current_editor.blogs.build
    end

    @editor = Editor.first
    @blogs = @editor.blogs.paginate(page: params[:page])
  end
end

Note: I am using Editor.first above because I (ie. editor_id: 1) will be the only editor of my blog. I just created an Editor model to store the password_digest.

So, why isn’t my application deploying on Heroku?

Any feedback would be appreciated. Also, please let me know if you need to see additional files, and I will attach.

Thanks so much!

Answer 1

Running db:migrate only runs the database migrations, it won’t copy any data from your development environment to Heroku. You should be using heroku db:push to push data from your local environment to Heroku:

Import: Push to Heroku

Use heroku db:push when you wish to transfer an existing database to Heroku. For example, you might want to import an SQLite database that you’ve been working with in local development or a MySQL database you have deployed on another host.

That sounds like what you want to do so try running heroku db:push.