How do I ADD the pg gem in the production environment in Rails

Question

I am new to programming and using RAILS on Cloud9 IDE. I am having difficulty trying to push my app into Heroku. I get the error:...

Push rejected, no Cedar-supported app detected
remote: HINT: This occurs when Heroku cannot detect the buildpack
remote:

NOTE: The tutorial I am following tells me at Heroku setup section:

Heroku uses the PostgreSQL database (pronounced “post-gres-cue-ell”, and often called “Postgres” for short), which means that we need to add the pg gem in the production environment to allow Rails to talk to Postgres:17
 group :production do   
    gem 'pg', '0.17.1'   
    gem 'rails_12factor', '0.0.2’ 
 end

Question: How do I ADD the pg gem in the production environment (I suspect that the push rejected error is due to this)

This should help with the `push rejected...` issue: http://stackoverflow.com/questions/8361475/heroku-push-rejected-no-cedar-supported-app-detected — Prakash Murthy, Jun 04 '15 at 13:25

wpp · Answer 1 · 2017-10-01T19:21:27.750

5

There should be a file in your application called Gemfile

open it up and add:

group :production do
 gem 'pg', '0.17.1'
 gem 'rails_12factor', '0.0.2'
end

save the file, commit and try again.

edited Oct 01 '17 at 19:21

answered Jun 04 '15 at 13:30

wpp

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Thank you. Do you mean add this text direct into the file itself at the bottom or inputed through the Command Line – Chris Dormani Jun 04 '15 at 13:41
It says cannot find Gemfile. Yet the Gemfile is opened with the group :production do gem 'pg', '0.17.1' gem 'rails_12factor', '0.0.2’ end – Chris Dormani Jun 04 '15 at 14:04

Akshay Borade · Answer 2 · 2017-10-02T09:17:58.220

1

In your Gemfile

group :production do
  gem 'pg', '0.17.1'
  gem 'rails_12factor'
end

and also remove gem 'sqlite3' OR

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

Because heroku can't install the sqlite3 gem. But you can tell bundler that it shouldn't be trying to except when developing.

Then run bundle install and try to deploy on Heroku.

edited Oct 02 '17 at 09:17

answered Jun 04 '15 at 13:48

Akshay Borade

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Obliged will try this out. Can you advise why the 'sqlite3" should be removed. This is not in the tutorial. – Chris Dormani Jun 04 '15 at 13:52
SQLite runs in memory, and backs up its data store in files on disk. While this strategy works well for development, Heroku’s Cedar stack has an ephemeral filesystem. You can write to it, and you can read from it, but the contents will be cleared periodically. If you were to use SQLite on Heroku, you would lose your entire database at least once every 24 hours. – Akshay Borade Jun 04 '15 at 14:04
appreciate this. Thank you. – Chris Dormani Jun 04 '15 at 14:12
@Chris : Hope this will help full for you, Please up vote my answer. – Akshay Borade Jun 04 '15 at 14:14
Why you are not up voting my answer? – Akshay Borade Jun 04 '15 at 14:23
It says that It can not find the Gemfile – Chris Dormani Jun 04 '15 at 14:27
On heroku or your local system? – Akshay Borade Jun 04 '15 at 14:30
on my local system (the cloud IDE) – Chris Dormani Jun 04 '15 at 14:35
Make sure you are in your project directory from command prompt. – Akshay Borade Jun 04 '15 at 16:45
If you are in your project directory through command prompt then run `bundle install`. – Akshay Borade Jun 04 '15 at 19:28

How do I ADD the pg gem in the production environment in Rails

2 Answers2