Rails app working locally but not in production - ruby-on-rails

Question

I have a rails app that's working totally fine locally but when i pushed it on heroku it showing "Application Error"enter image description here
i tried visiting the heroku app logs but there was nothing out there, but when i tried running heroko console it started giving this error:
C:\Sites\bbb>heroku run rails console
This is the legacy Heroku CLI. Please install the new CLI from https://cli.herok
u.com
Running rails console on hidden-hollows-63773... up, run.4100 (Free)
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-5.0.2/lib/active_record/connecti
on_adapters/connection_specification.rb:176:in `rescue in spec': Specified 'sqli
te3' for database adapter, but the gem is not loaded. Add `gem 'sqlite3'` to you
r Gemfile (and ensure its version is at the minimum required by ActiveRecord). (
Gem::LoadError)
from /app/vendor/bundle/ruby/2.3.0/gems/activerecord-5.0.2/lib/active_re
cord/connection_adapters/connection_specification.rb:173:in `spec'
from /app/vendor/bundle/ruby/2.3.0/gems/activerecord-5.0.2/lib/active_re
cord/connection_handling.rb:53:in `establish_connection'
from /app/vendor/bundle/ruby/2.3.0/gems/activerecord-5.0.2/lib/active_re
cord/railtie.rb:125:in `block (2 levels) in <class:Railtie>'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/lazy_load_hooks.rb:43:in `instance_eval'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/lazy_load_hooks.rb:43:in `execute_hook'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/lazy_load_hooks.rb:50:in `block in run_load_hooks'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/lazy_load_hooks.rb:49:in `each'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/lazy_load_hooks.rb:49:in `run_load_hooks'
from /app/vendor/bundle/ruby/2.3.0/gems/activerecord-5.0.2/lib/active_re
cord/base.rb:324:in `<module:ActiveRecord>'
from /app/vendor/bundle/ruby/2.3.0/gems/activerecord-5.0.2/lib/active_re
cord/base.rb:24:in `<top (required)>'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies.rb:293:in `require'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies.rb:293:in `block in require'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies.rb:259:in `load_dependency'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies.rb:293:in `require'
from /app/app/models/application_record.rb:1:in `<top (required)>'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies.rb:293:in `require'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies.rb:293:in `block in require'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies.rb:259:in `load_dependency'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies.rb:293:in `require'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies.rb:380:in `block in require_or_load'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies.rb:37:in `block in load_interlock'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies/interlock.rb:12:in `block in loading'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/concurrency/share_lock.rb:150:in `exclusive'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies/interlock.rb:11:in `loading'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies.rb:37:in `load_interlock'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies.rb:358:in `require_or_load'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies.rb:336:in `depend_on'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.2/lib/active_s
upport/dependencies.rb:252:in `require_dependency'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/engine.
rb:476:in `block (2 levels) in eager_load!'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/engine.
rb:475:in `each'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/engine.
rb:475:in `block in eager_load!'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/engine.
rb:473:in `each'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/engine.
rb:473:in `eager_load!'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/engine.
rb:354:in `eager_load!'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/applica
tion/finisher.rb:59:in `each'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/applica
tion/finisher.rb:59:in `block in <module:Finisher>'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/initial
izable.rb:30:in `instance_exec'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/initial
izable.rb:30:in `run'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/initial
izable.rb:55:in `block in run_initializers'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:228:in `block in tso
rt_each'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:350:in `block (2 lev
els) in each_strongly_connected_component'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:431:in `each_strongl
y_connected_component_from'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:349:in `block in eac
h_strongly_connected_component'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:347:in `each'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:347:in `call'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:347:in `each_strongl
y_connected_component'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:226:in `tsort_each'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:205:in `tsort_each'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/initial
izable.rb:54:in `run_initializers'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/applica
tion.rb:352:in `initialize!'
from /app/config/environment.rb:5:in `<top (required)>'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/applica
tion.rb:328:in `require'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/applica
tion.rb:328:in `require_environment!'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/command
s/commands_tasks.rb:157:in `require_application_and_environment!'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/command
s/commands_tasks.rb:77:in `console'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/command
s/commands_tasks.rb:49:in `run_command!'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.2/lib/rails/command
s.rb:18:in `<top (required)>'
from /app/bin/rails:4:in `require'
from /app/bin/rails:4:in `<main>'
My Gemfile
source 'https://rubygems.org'
git_source(:github) do |repo_name|
repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
"https://github.com/#{repo_name}.git"
end
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.0.2'
# Use sqlite3 as the database for Active Record
group :production do
gem 'pg', '0.18.1'
gem 'rails_12factor'
end
group :development, :test do
gem 'sqlite3'
gem 'byebug'
end
# Use Puma as the app server
gem 'puma', '~> 3.0'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby
# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 3.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'
# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
group :development, :test do
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
gem 'byebug', platform: :mri
end
group :development do
# Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
gem 'web-console', '>= 3.3.0'
end
# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
My Database.yml
# SQLite version 3.x
# gem install sqlite3
#
# Ensure the SQLite 3 gem is defined in your Gemfile
# gem 'sqlite3'
#
default: &default
adapter: sqlite3
pool: 5
timeout: 5000
development:
<<: *default
database: db/development.sqlite3
# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
<<: *default
database: db/test.sqlite3
production:
<<: *default
database: db/production.sqlite3

Answer 1

You are setting sqlite as the default database with this code
default: &default
adapter: sqlite3
pool: 5
timeout: 5000
So with this code it is getting set as sqlite because you are including the defualt values, which will not work on heroku because you cannot use sqlite on heroku.
production:
<<: *default
database: db/production.sqlite3
You should change the production database values in the database.yml file.
production:
adapter: postgresql
pool: 5
timeout: 5000
database: app_name

Answer 2

In your database.yml file change the production db to use postgresql as heroku doesn't support sqlite3.
For example:
production:
database: example_production
adapter: postgresql
host: localhost
password: