Heroku deployment failed because of sqlite3 gem error

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Heroku can’t install the sqlite3 gem, for whatever reason. But you can tell bundler that it shouldn’t be trying to except when developing.

In your Gemfile, replace gem 'sqlite3' with:

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

Then bundler on heroku, running as production, won’t try to install it.

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