本文介绍了耙子中止了！ Gem :: LoadError：为数据库适配器指定'postgresql'的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我是Rails的新手。一切都很好，直到我改变我的Gemfile才能够使用heroku。我在我的Gemfile中有pg，但运行 bundle exec rake test 时仍然出现此错误。
我无法使用rails
rake aborted！ Gem :: LoadError：为数据库适配器指定'postgresql'，但未加载该gem。将`gem'pg'`添加到您的Gemfile中（并确保其版本处于ActiveRecord所要求的最低限度）。 /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/connection_specification.rb:177:in`rescue in spec' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/connection_specification.rb:174:in`spec' / home / rihanna /。 rvm / gems / ruby-2.2.0 / gems / activerecord-4.2.0 / lib / active_record / connection_handling.rb：50：在'establish_connection'中 /home/rihanna/.rvm/gems/ruby-2.2。 0 / gems / activerecord-4.2.0 / lib / active_record / railtie.rb：120：在< class：Railtie>中的block（2 levels）中' /home/rihanna/.rvm/gems/ruby -2.2.0 / gems / activesupport-4.2.0 / lib / active_support / lazy_load_hooks.rb：38：在`instance_eval' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport -4.2.0 / lib / active_support / lazy_load_hooks.rb：38：在`execute_hook' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support /lazy_load_hooks.rb:45:in`block in run_load_hooks' /home/rihanna/.rvm/ge ms / ruby-2.2.0 / gems / activesupport-4.2.0 / lib / active_support / lazy_load_hooks.rb：44：在`each' /home/rihanna/.rvm/gems/ruby-2.2.0/ gems / activesupport-4.2.0 / lib / active_support / lazy_load_hooks.rb：44：在`run_load_hooks' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/ lib / active_record / base.rb：316：在< module：ActiveRecord>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record /base.rb:26:in`< top（required）>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/ migration.rb：411：in`maintain_test_schema！' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_help.rb:19:in `< top（required）>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in`需要' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in'block in require' /home/rihanna/.rvm/gems/ruby-2.2 .0 / gems / activesupport-4.2.0 / lib / active_support / dependencies.rb：240：在`load_dependency' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2 .0 / lib / active_support / dependencies.rb：274：在'require'中 /home/rihanna/workspace/sample_app/test/test_helper.rb:3:in`< top（required）>' /home/rihanna/workspace/sample_app/test/controllers/static_pages_controller_test.rb:1:in`require' /home/rihanna/workspace/sample_app/test/controllers/static_pages_controller_test.rb:1:in `< top（required）>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114： in'require' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in`block（3 levels ）in define' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in`each' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in`blo ck（2级）定义' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:113:in` ' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:113:in'block in define' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:20:in`invoke_rake_task' / home / rihanna /.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/testing.rake:8:in`block in< top（required）>' Gem :: LoadError：pg不是捆绑的一部分。将它添加到Gemfile。 /home/rihanna/.rvm/gems/ruby-2.2.0/gems/bundler-1.8.5/lib/bundler/rubygems_integration.rb:261:in`block in replace_gem' / home /rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/postgresql_adapter.rb:16:in`< top（required）>' / home / rihanna / .rvm / gems / ruby-2.2.0 / gems / activesupport-4.2.0 / lib / active_support / dependencies.rb：274：在'require'中 /home/rihanna/.rvm/gems /ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in`block in require' /home/rihanna/.rvm/gems/ruby-2.2.0 /gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in`load_dependency' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0 /lib/active_support/dependencies.rb:274:in`require' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/connection_specification .rb：175：在`spec'中 /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_re cord / connection_handling.rb：50：在`establish_connection'中 /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/railtie.rb:120：在< class：Railtie>'块（2级）中' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb ：38：在`instance_eval' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:38:in`execute_hook' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:45:in`block in run_load_hooks' / home / rihanna / .rvm / gems / ruby-2.2.0 / gems / activesupport-4.2.0 / lib / active_support / lazy_load_hooks.rb：44：在`each' /home/rihanna/.rvm/gems/ruby -2.2.0 / gems / activesupport-4.2.0 / lib / active_support / lazy_load_hooks.rb：44：在`run_load_hooks' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord -4.2.0 / lib / active_record / base.rb：316：在< module：ActiveRecord>' /home/rihanna/.rvm/gems/r uby-2.2.0 / gems / activerecord-4.2.0 / lib / active_record / base.rb：26：在< top（required）>' /home/rihanna/.rvm/gems/ruby -2.2.0 / gems / activerecord-4.2.0 / lib / active_record / migration.rb：411：in`maintain_test_schema！' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/ railties-4.2.0 / lib / rails / test_help.rb：19：在< top（required）>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport -4.2.0 / lib / active_support / dependencies.rb：274：在'require'中 /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support /dependencies.rb:274:in`block in require' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240 ：在`load_dependency' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in`require' /home/rihanna/workspace/sample_app/test/test_helper.rb:3:in`< top（required）>' / home / rihanna / workspace / sample_app / test / controllers / static_pages_controll er_test.rb：1：'require' /home/rihanna/workspace/sample_app/test/controllers/static_pages_controller_test.rb:1:in`< top（required）>' / home /rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in`require' /home/rihanna/.rvm/ gems / ruby-2.2.0 / gems / railties-4.2.0 / lib / rails / test_unit / sub_test_task.rb：114：在'block（3 levels）in define' /home/rihanna/.rvm/ gems / ruby-2.2.0 / gems / railties-4.2.0 / lib / rails / test_unit / sub_test_task.rb：114：在`each' /home/rihanna/.rvm/gems/ruby-2.2。 0 / gems / railties-4.2.0 / lib / rails / test_unit / sub_test_task.rb：114：在'block（2 levels）in define' /home/rihanna/.rvm/gems/ruby-2.2。 0 / gems / railties-4.2.0 / lib / rails / test_unit / sub_test_task.rb：113：在`each' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties- 4.2.0 / lib / rails / test_unit / sub_test_task.rb：113：在`block in define'中 /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/ lib / rails / test_unit / sub_test_task.rb：20：在`invoke_rake _task' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/testing.rake:8:in`block in< top（必需）>'任务：TOP =>测试：运行，这是我的Gemfile：
source'rubygems' ＃捆绑边缘Rails改为：gem'rails'，github：'rails / rails' gem'rails'，'4.2.0'＃使用sqlite3作为活动记录的数据库 #gem'pg'＃使用SCSS样式表 gem'sass-rails'，'〜> 5.0'＃使用Uglifier作为JavaScript资产的压缩器 gem'uglifier'，'> = 1.3.0'＃使用CoffeeScript作为.coffee资产和视图 gem'咖啡栏'，'〜> 4.1.0'＃请参阅github/sstephenson/execjs#readme以获得更多支持的运行时＃gem'therubyracer'，平台:: ruby ＃使用jquery作为JavaScript库 gem'jquery-rails'＃Turbolinks使Web应用程序中的以下链接更快。阅读更多：github/rails/turbolinks gem'turbolinks'＃轻松构建JSON API。阅读更多：github/rails/jbuilder gem'jbuilder'，'〜> 2.0'＃bundle exec rake doc：rails在doc / api下生成API。 gem'sdoc'，'〜> 0.4.0'，组：：doc ＃使用ActiveModel has_secure_password ＃gem'bcrypt'，'〜> 3.1.7' ＃使用Unicorn作为应用服务器＃gem'unicorn' ＃使用Capistrano进行部署＃gem'capistrano- rails'，group：：development group：development，：test do ＃在代码的任何地方调用'byebug'来停止执行并获得调试器控制台 gem'byebug ' gem'sqlite3'＃在异常页面或通过使用<％= console％>访问IRB控制台。在视图中 gem'web-console'，'〜> 2.0' ＃Spring通过让应用程序在后台运行来加速开发。阅读更多：github/rails/spring gem'spring' end group：production do gem'pg '，'0.18.1' gem'rails_12factor'，'0.0.2' end解决方案
类似的问题，尽管gemfile是正确的（生产中的pg和dev中的sqlite，database.yml中有postgresql）。捆绑拒绝皮卡宝石。
我是创建heroku实例的脚本，因此所有这些都在cli上
我的解决方案 显式添加postgress附加组件（ heroku addons：create heroku-postgresql ：hobby-dev --app< myappname> ）。这似乎迫使它足够早地创建DATABASE_URL（创建postgresql-xxxxxxx-9999为DATABASE_URL ）。在这一点上捆绑似乎工作。 其他我认为/尝试并保留每个环境创建的东西，是确保您强制设置变量尽快在 heroku config：set --app< mayappname> RAILS_ENV =生产
I'm new to Rails. Everything was OK till I change my Gemfile to be able to use heroku. I have pg in my Gemfile but I still get this error while running bundle exec rake test
I cannot use rails console either.
rake aborted! Gem::LoadError: Specified 'postgresql' for database adapter, but the gem is not loaded. Add `gem 'pg'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord). /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/connection_specification.rb:177:in `rescue in spec' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/connection_specification.rb:174:in `spec' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_handling.rb:50:in `establish_connection' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/railtie.rb:120:in `block (2 levels) in <class:Railtie>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:45:in `block in run_load_hooks' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:44:in `each' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:44:in `run_load_hooks' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/base.rb:316:in `<module:ActiveRecord>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/base.rb:26:in `<top (required)>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/migration.rb:411:in `maintain_test_schema!' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_help.rb:19:in `<top (required)>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `block in require' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require' /home/rihanna/workspace/sample_app/test/test_helper.rb:3:in `<top (required)>' /home/rihanna/workspace/sample_app/test/controllers/static_pages_controller_test.rb:1:in `require' /home/rihanna/workspace/sample_app/test/controllers/static_pages_controller_test.rb:1:in `<top (required)>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in `require' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in `block (3 levels) in define' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in `each' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in `block (2 levels) in define' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:113:in `each' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:113:in `block in define' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:20:in `invoke_rake_task' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/testing.rake:8:in `block in <top (required)>' Gem::LoadError: pg is not part of the bundle. Add it to Gemfile. /home/rihanna/.rvm/gems/ruby-2.2.0/gems/bundler-1.8.5/lib/bundler/rubygems_integration.rb:261:in `block in replace_gem' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/postgresql_adapter.rb:16:in `<top (required)>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `block in require' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/connection_specification.rb:175:in `spec' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_handling.rb:50:in `establish_connection' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/railtie.rb:120:in `block (2 levels) in <class:Railtie>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:45:in `block in run_load_hooks' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:44:in `each' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:44:in `run_load_hooks' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/base.rb:316:in `<module:ActiveRecord>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/base.rb:26:in `<top (required)>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activerecord-4.2.0/lib/active_record/migration.rb:411:in `maintain_test_schema!' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_help.rb:19:in `<top (required)>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `block in require' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require' /home/rihanna/workspace/sample_app/test/test_helper.rb:3:in `<top (required)>' /home/rihanna/workspace/sample_app/test/controllers/static_pages_controller_test.rb:1:in `require' /home/rihanna/workspace/sample_app/test/controllers/static_pages_controller_test.rb:1:in `<top (required)>' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in `require' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in `block (3 levels) in define' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in `each' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in `block (2 levels) in define' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:113:in `each' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:113:in `block in define' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:20:in `invoke_rake_task' /home/rihanna/.rvm/gems/ruby-2.2.0/gems/railties-4.2.0/lib/rails/test_unit/testing.rake:8:in `block in <top (required)>' Tasks: TOP => test:runand this is my Gemfile:
source 'rubygems' # Bundle edge Rails instead: gem 'rails', github: 'rails/rails' gem 'rails', '4.2.0' # Use sqlite3 as the database for Active Record #gem 'pg' # 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', '~> 4.1.0' # See github/sstephenson/execjs#readme for more supported runtimes # gem 'therubyracer', platforms: :ruby # Use jquery as the JavaScript library gem 'jquery-rails' # Turbolinks makes following links in your web application faster. Read more: github/rails/turbolinks gem 'turbolinks' # Build JSON APIs with ease. Read more: github/rails/jbuilder gem 'jbuilder', '~> 2.0' # bundle exec rake doc:rails generates the API under doc/api. gem 'sdoc', '~> 0.4.0', group: :doc # Use ActiveModel has_secure_password # gem 'bcrypt', '~> 3.1.7' # Use Unicorn as the app server # gem 'unicorn' # 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' gem 'sqlite3' # Access an IRB console on exception pages or by using <%= console %> in views gem 'web-console', '~> 2.0' # Spring speeds up development by keeping your application running in the background. Read more: github/rails/spring gem 'spring' end group :production do gem 'pg', '0.18.1' gem 'rails_12factor', '0.0.2' end解决方案
similar problems, despite Gemfile being correct (pg in produciton, and sqlite in dev, database.yml had postgresql). bundle refused to pickup pg gem.
i was scripting the creation of heroku instance, so all this was on the cli
My solution
explicitly add postgress add-on (heroku addons:create heroku-postgresql:hobby-dev --app <myappname>). this seems to force it to create DATABASE_URL early enough (Created postgresql-xxxxxxx-9999 as DATABASE_URL). at which point bundle seemed to work.
something else I considered / tried and have kept for each environment creation, is to make sure you force variables to be set ASAP in the process heroku config:set --app <mayappname> RAILS_ENV=production
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耙子中止了！ Gem :: LoadError：为数据库适配器指定'postgresql'
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