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If you're installing puma version below 3.7 or 3.8, because puma requires openssl, you'll get the following error when you attempt to install the puma gem either directly or from a Gemfile:

Building native extensions.  This could take a while...
ERROR:  Error installing puma:
	ERROR: Failed to build gem native extension.

    current directory: /Users/esther/.rbenv/versions/2.3.0/gemsets/contagious/gems/puma-2.6.0/ext/puma_http11
/Users/esther/.rbenv/versions/2.3.0/bin/ruby -r ./siteconf20170830-2950-8i5exi.rb extconf.rb
creating Makefile

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Step 1 - Create a Backup and Download it

heroku pg:backups:capture
heroku pg:backups:download

Step 2 - Using pg_restore command

pg_restore --verbose --clean --no-acl --no-owner -h localhost -U username -d development_dbname ~/Downloads/blah1234blah789

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module Authenticable

  # Devise methods overwrite
  def current_user
    @current_user ||= User.find_by(authentication_token: request.headers['Authorization'])
  end

  def authenticate_with_token!
    render json: { errors: "Not authenticated" },
                status: :unauthorized unless user_signed_in?

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Ref: https://stackoverflow.com/questions/24622568/rails-generate-model-hangs

So, I ran into a mysterious situation where running a rails g migration ... command on my terminal freezes/hangs for a really long time.

Running ps aux | grep spring gave me a clue into what was going on.

I got the following:

esther 4201 0.0 0.0 2480224 2692 ?? S 6Sep17 0:00.82 spring server | panacea | started 191 hours ago

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So, you just cloned an existing project's repo and you run bundle install but you got the error: rbenv: version x.x.x is not installed....

What the issue means? The project uses a specific ruby version that you do not have on your system.

Here's how to fix it:

• Install the Ruby build for the specified version using:

rbenv install x.x.x