我想做什么
我正在构建一个带有 rails 的应用程序，并部署一个非主分支来 heroku 主测试应用程序在生产中。在我知道我在 Heroku 上做什么之前，我不想惹 master，因此我部署了一个功能分支。
如果需要引用，可以在此处找到应用程序的存储库。
对gemfile进行任何更改后，我运行了：
bundle update
bundle install
git add .
git commit
git push heroku 0007/heroku:master
最后一个命令记录在此处，用于将非主分支推送到 herokus 主节点。通常这样做是因为您不想惹主人。不久前我也问过这个问题。如何为 heroku 设置非大师的问题可以在这里找到。
我调整了database.yml以适应postgresql和sqlite3的Heroku需求。
default: &default
adapter: sqlite3
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
timeout: 5000
development:
<<: *default
database: db/development.sqlite3
test:
<<: *default
database: db/test.sqlite3
production:
<<: *default
database: db/production.sqlite3
我的宝石文件也非常直接：
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
ruby '2.4.1'
# Use sqlite3 as the database for Active Record
gem 'sqlite3', group: :development # Added development group.
gem 'pg', group: :production # Added postgres and made it production only.
gem 'rails_12factor'
# Specifying an exact Ruby version
ruby '2.4.1'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.1.4'
# Use Puma as the app server
gem 'puma', '~> 3.7'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# 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
# Step-by-step debugging and stack navigation in Pry
gem 'pry-byebug', platform: :ruby
# Pry is a powerful alternative to the standard IRB shell for Ruby
gem 'pry-rails'
# Pretty print your Ruby objects with style -- in full color and with proper indentation
gem 'awesome_print'
# Add a comment summarizing the current schema to the top or bottom of each of your ActiveRecord models, Specs, factory_girl factories...
gem 'annotate'
# Annotate guard runs the annotate gem when needed
gem 'guard-annotate', '~> 2.3'
# Use for fighting the N+1 problem in Ruby
gem 'bullet'
# Speedup RSpec + Cucumber by running parallel on multiple CPU cores
gem 'parallel_tests'
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
# Adds support for Capybara system testing and selenium driver
gem 'capybara', '~> 2.13'
gem 'selenium-webdriver'
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'
gem 'listen', '>= 3.0.5', '< 3.2'
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'
gem 'spring-watcher-listen', '~> 2.0.0'
# bundler-audit provides patch-level verification for Bundled apps
gem 'bundler-audit', '~> 0.6.0', require: false
# Bundler guard allows to automatically & intelligently install/update bundle when needed.
gem 'guard-bundler', '~> 2.1', require: false
# compare licenses against a user-defined whitelist, and give you an actionable exception report
gem 'license_finder', '~> 3.0', '>= 3.0.1', require: false
# Brakeman is an open source static analysis tool which checks Rails applications for security vulnerabilities.
gem 'brakeman', require: false
# Better Errors replaces the standard Rails error page with a much better and more useful error page
gem 'better_errors'
# necessary to use Better Errors' advanced features
gem 'binding_of_caller', platforms: :ruby
# RuboCop configuration which has the same code style checking as official Ruby on Rails
gem 'rubocop', '~> 0.51.0', require: false
gem 'guard-rubocop', require: false
# i18n-tasks helps you find and manage missing and unused translations
gem 'i18n-tasks', require: false
# IYE makes it easy to translate your Rails I18N files and keeps them up to date
gem 'iye', require: false
# Image Uploader Carrierwave for all kinds of Picture related jobs
gem 'carrierwave', '~> 1.0'
end
group :test do
# Guard is a command line tool to easily handle events on file system modifications
gem 'guard'
gem 'guard-minitest'
# This gem brings back assigns to your controller tests as well as assert_template
gem 'rails-controller-testing'
# To get the default Rails tests to show red and green at the appropriate times
gem 'minitest-reporters'
# Strategies for cleaning databases in Ruby. Can be used to ensure a clean state for testing.
gem 'database_cleaner'
# Code coverage for Ruby
gem 'simplecov', require: false
# Collection of testing matchers extracted from Shoulda
gem 'shoulda-matchers'
end
# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
问题所在
在本地测试我的应用程序后，我决定将其推送到 Heroku，但我无法解决依赖冲突。
可疑错误：
为数据库适配器指定了"sqlite3"，但未装入 gem。 将
gem 'sqlite3'添加到您的宝石文件
我知道这个问题已经记录在许多帖子中。我梳理了它们，以找到我错过的东西，但无济于事。
这些是我在这个问题上找到的帖子：
- 来源 1
- 来源 2
- 来源 3
他们基本上都说，请注意，您将postgresql设置为生产环境，将sqlite3设置为开发数据库，或者从一开始就使用postgres设置您的项目。
据我所知，我已经涵盖了这一点。
我将我的 gemfile 设置为使用pg作为生产数据库，sqlite3用作开发数据库，如此处和此处所述。
我的 gemfile 似乎没有任何针对 sqlite 的生产部门。
[57] → gem dependency -R sqlite
Gem sqlite3-1.3.13
hoe (~> 3.15, development)
hoe-bundler (~> 1.0, development)
mini_portile (~> 0.6.2, development)
minitest (~> 5.9, development)
rake-compiler (~> 0.9.3, development)
rake-compiler-dock (~> 0.5.2, development)
rdoc (~> 4.0, development)
Used by
awesome_print-1.8.0 (sqlite3 (>= 0, development))
database_cleaner-1.7.0 (sqlite3 (>= 0, development))
rails-controller-testing-1.0.2 (sqlite3 (>= 0, development))
sass-rails-5.0.7 (sqlite3 (>= 0, development))
尝试运行$ heroku run rake db:migrate时，问题开始显现。
这是来自 heroku 的制作轨迹：
[159] → heroku logs --tail
2018-09-03T03:00:29.276401+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:130:in `tap'
2018-09-03T03:00:29.276425+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:130:in `perform'
2018-09-03T03:00:29.276472+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in `invoke_command'
2018-09-03T03:00:29.276495+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/thor-0.20.0/lib/thor.rb:387:in `dispatch'
2018-09-03T03:00:29.276518+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/command/base.rb:63:in `perform'
2018-09-03T03:00:29.276542+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/command.rb:44:in `invoke'
2018-09-03T03:00:29.276567+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/commands.rb:16:in `<top (required)>'
2018-09-03T03:00:29.276591+00:00 app[web.1]: from bin/rails:9:in `require'
2018-09-03T03:00:29.276615+00:00 app[web.1]: from bin/rails:9:in `<main>'
2018-09-03T08:35:36.524552+00:00 heroku[web.1]: State changed from crashed to starting
2018-09-03T08:35:39.232773+00:00 heroku[web.1]: Starting process with command `bin/rails server -p 52942 -e production`
2018-09-03T08:35:42.729326+00:00 heroku[web.1]: State changed from starting to crashed
2018-09-03T08:35:42.656882+00:00 app[web.1]: => Booting Puma
2018-09-03T08:35:42.656898+00:00 app[web.1]: => Rails 5.1.6 application starting in production
2018-09-03T08:35:42.656899+00:00 app[web.1]: => Run `rails server -h` for more startup options
2018-09-03T08:35:42.656900+00:00 app[web.1]: Exiting
2018-09-03T08:35:42.656943+00:00 app[web.1]: /app/vendor/bundle/ruby/2.4.0/gems/activerecord-5.1.6/lib/active_record/connection_adapters/connection_specification.rb:188:in `rescue in spec': Specified 'sqlite3' for database adapter, but the gem is not loaded. Add `gem 'sqlite3'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord). (Gem::LoadError)
2018-09-03T08:35:42.656967+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activerecord-5.1.6/lib/active_record/connection_adapters/connection_specification.rb:185:in `spec'
2018-09-03T08:35:42.656977+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activerecord-5.1.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:880:in `establish_connection'
2018-09-03T08:35:42.656980+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activerecord-5.1.6/lib/active_record/connection_handling.rb:58:in `establish_connection'
2018-09-03T08:35:42.656982+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activerecord-5.1.6/lib/active_record/railtie.rb:124:in `block (2 levels) in <class:Railtie>'
2018-09-03T08:35:42.656983+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/lazy_load_hooks.rb:69:in `instance_eval'
2018-09-03T08:35:42.657020+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/lazy_load_hooks.rb:69:in `block in execute_hook'
2018-09-03T08:35:42.657023+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/lazy_load_hooks.rb:60:in `with_execution_control'
2018-09-03T08:35:42.657024+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/lazy_load_hooks.rb:65:in `execute_hook'
2018-09-03T08:35:42.657027+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/lazy_load_hooks.rb:50:in `block in run_load_hooks'
2018-09-03T08:35:42.657038+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/lazy_load_hooks.rb:49:in `each'
2018-09-03T08:35:42.657065+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/lazy_load_hooks.rb:49:in `run_load_hooks'
2018-09-03T08:35:42.657068+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activerecord-5.1.6/lib/active_record/base.rb:326:in `<module:ActiveRecord>'
2018-09-03T08:35:42.657070+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activerecord-5.1.6/lib/active_record/base.rb:25:in `<top (required)>'
2018-09-03T08:35:42.657073+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `require'
2018-09-03T08:35:42.657083+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `block in require'
2018-09-03T08:35:42.657086+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:258:in `load_dependency'
2018-09-03T08:35:42.657110+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `require'
2018-09-03T08:35:42.657113+00:00 app[web.1]: from /app/app/models/application_record.rb:1:in `<top (required)>'
2018-09-03T08:35:42.657123+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `require'
2018-09-03T08:35:42.657128+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `block in require'
2018-09-03T08:35:42.657152+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:258:in `load_dependency'
2018-09-03T08:35:42.657153+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `require'
2018-09-03T08:35:42.657154+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:379:in `block in require_or_load'
2018-09-03T08:35:42.657178+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:36:in `block in load_interlock'
2018-09-03T08:35:42.657181+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies/interlock.rb:12:in `block in loading'
2018-09-03T08:35:42.657184+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/concurrency/share_lock.rb:149:in `exclusive'
2018-09-03T08:35:42.657186+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies/interlock.rb:11:in `loading'
2018-09-03T08:35:42.657212+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:36:in `load_interlock'
2018-09-03T08:35:42.657213+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:357:in `require_or_load'
2018-09-03T08:35:42.657216+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:335:in `depend_on'
2018-09-03T08:35:42.657220+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:251:in `require_dependency'
2018-09-03T08:35:42.657224+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/engine.rb:476:in `block (2 levels) in eager_load!'
2018-09-03T08:35:42.657226+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/engine.rb:475:in `each'
2018-09-03T08:35:42.657230+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/engine.rb:475:in `block in eager_load!'
2018-09-03T08:35:42.657232+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/engine.rb:473:in `each'
2018-09-03T08:35:42.657234+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/engine.rb:473:in `eager_load!'
2018-09-03T08:35:42.657238+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/engine.rb:354:in `eager_load!'
2018-09-03T08:35:42.657240+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/application/finisher.rb:67:in `each'
2018-09-03T08:35:42.657241+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/application/finisher.rb:67:in `block in <module:Finisher>'
2018-09-03T08:35:42.657243+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/initializable.rb:30:in `instance_exec'
2018-09-03T08:35:42.657247+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/initializable.rb:30:in `run'
2018-09-03T08:35:42.657249+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/initializable.rb:59:in `block in run_initializers'
2018-09-03T08:35:42.657250+00:00 app[web.1]: from /app/vendor/ruby-2.4.1/lib/ruby/2.4.0/tsort.rb:228:in `block in tsort_each'
2018-09-03T08:35:42.657252+00:00 app[web.1]: from /app/vendor/ruby-2.4.1/lib/ruby/2.4.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
2018-09-03T08:35:42.657254+00:00 app[web.1]: from /app/vendor/ruby-2.4.1/lib/ruby/2.4.0/tsort.rb:431:in `each_strongly_connected_component_from'
2018-09-03T08:35:42.657257+00:00 app[web.1]: from /app/vendor/ruby-2.4.1/lib/ruby/2.4.0/tsort.rb:349:in `block in each_strongly_connected_component'
2018-09-03T08:35:42.657259+00:00 app[web.1]: from /app/vendor/ruby-2.4.1/lib/ruby/2.4.0/tsort.rb:347:in `each'
2018-09-03T08:35:42.657260+00:00 app[web.1]: from /app/vendor/ruby-2.4.1/lib/ruby/2.4.0/tsort.rb:347:in `call'
2018-09-03T08:35:42.657261+00:00 app[web.1]: from /app/vendor/ruby-2.4.1/lib/ruby/2.4.0/tsort.rb:347:in `each_strongly_connected_component'
2018-09-03T08:35:42.657262+00:00 app[web.1]: from /app/vendor/ruby-2.4.1/lib/ruby/2.4.0/tsort.rb:226:in `tsort_each'
2018-09-03T08:35:42.657264+00:00 app[web.1]: from /app/vendor/ruby-2.4.1/lib/ruby/2.4.0/tsort.rb:205:in `tsort_each'
2018-09-03T08:35:42.657266+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/initializable.rb:58:in `run_initializers'
2018-09-03T08:35:42.657267+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/application.rb:353:in `initialize!'
2018-09-03T08:35:42.657268+00:00 app[web.1]: from /app/config/environment.rb:5:in `<top (required)>'
2018-09-03T08:35:42.657270+00:00 app[web.1]: from config.ru:3:in `require_relative'
2018-09-03T08:35:42.657273+00:00 app[web.1]: from config.ru:3:in `block in <main>'
2018-09-03T08:35:42.657274+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.5/lib/rack/builder.rb:55:in `instance_eval'
2018-09-03T08:35:42.657275+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.5/lib/rack/builder.rb:55:in `initialize'
2018-09-03T08:35:42.657278+00:00 app[web.1]: from config.ru:in `new'
2018-09-03T08:35:42.657279+00:00 app[web.1]: from config.ru:in `<main>'
2018-09-03T08:35:42.657280+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.5/lib/rack/builder.rb:49:in `eval'
2018-09-03T08:35:42.657283+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.5/lib/rack/builder.rb:49:in `new_from_string'
2018-09-03T08:35:42.657284+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.5/lib/rack/builder.rb:40:in `parse_file'
2018-09-03T08:35:42.657287+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.5/lib/rack/server.rb:319:in `build_app_and_options_from_config'
2018-09-03T08:35:42.657288+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.5/lib/rack/server.rb:219:in `app'
2018-09-03T08:35:42.657290+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:24:in `app'
2018-09-03T08:35:42.657291+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.5/lib/rack/server.rb:354:in `wrapped_app'
2018-09-03T08:35:42.657294+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.5/lib/rack/server.rb:283:in `start'
2018-09-03T08:35:42.657295+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:44:in `start'
2018-09-03T08:35:42.657301+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:135:in `block in perform'
2018-09-03T08:35:42.657302+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:130:in `tap'
2018-09-03T08:35:42.657305+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/commands/server/server_command.rb:130:in `perform'
2018-09-03T08:35:42.657306+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/thor-0.20.0/lib/thor/command.rb:27:in `run'
2018-09-03T08:35:42.657307+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in `invoke_command'
2018-09-03T08:35:42.657308+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/thor-0.20.0/lib/thor.rb:387:in `dispatch'
2018-09-03T08:35:42.657311+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/command/base.rb:63:in `perform'
2018-09-03T08:35:42.657312+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/command.rb:44:in `invoke'
2018-09-03T08:35:42.657313+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.6/lib/rails/commands.rb:16:in `<top (required)>'
2018-09-03T08:35:42.657316+00:00 app[web.1]: from bin/rails:9:in `require'
2018-09-03T08:35:42.657318+00:00 app[web.1]: from bin/rails:9:in `<main>'
2018-09-03T08:35:42.704940+00:00 heroku[web.1]: Process exited with status 1
2018-09-03T09:52:58.423149+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=attendion.herokuapp.com request_id=fc40234e-28c4-4007-a780-1731f87512d4 fwd="87.144.250.234" dyno= connect= service= status=503 bytes= protocol=https
2018-09-03T09:52:59.224100+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=attendion.herokuapp.com request_id=786316ef-6db5-48b9-9590-5467827cf791 fwd="87.144.250.234" dyno= connect= service= status=503 bytes= protocol=https
SQLite不能与Heroku一起使用，因为它是基于磁盘的，Heroku使用临时文件系统。
SQLite 在内存中运行，并将其数据存储备份到磁盘上的文件中。 虽然这种策略适用于开发，但 Heroku 的雪松堆栈 具有临时文件系统。你可以写它，你可以阅读 从中，但内容将定期清除。如果你要 在 Heroku 上使用 SQLite，你至少会丢失整个数据库 每 24 小时一次。
即使 Heroku 的磁盘持续运行 SQLite 仍然不会 做一个合适的人。由于SQLite不作为服务运行，因此每个测功机都会 运行单独的运行副本。这些副本中的每一个都需要自己的磁盘 支持商店。这意味着为您的应用程序提供动力的每个测功机都将 具有不同的数据集，因为磁盘未同步。
-Heroku Devcenter：Heroku上的SQLite
Heroku 提供 Postgres 作为 rails 的免费默认数据库，它尽可能接近推荐。
如果要部署到Postgres，则还应该在Postgres上进行开发/测试。
后备服务之间的差异意味着微小的不兼容性 出现，导致代码在开发中有效并通过测试，或者 在生产中转储失败。这些类型的错误会产生摩擦 这会抑制持续部署。这种摩擦的成本 而后续对持续部署的抑制是极其严重的 在应用程序的生存期内汇总考虑时为高。
- https://12factor.net/dev-prod-parity
如果你真的想坚持使用SQLite，你需要正确配置适配器：
default: &default
adapter: sqlite3
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
timeout: 5000
development:
<<: *default
database: db/development.sqlite3
test:
<<: *default
database: db/test.sqlite3
production:
<<: *default
adapter: postgresql
# nothing else is needed
我不建议这样做。