我正在与其他人合作开展项目。它被部署到heroku，我们正在使用postgresql。
我想在本地分支机构中进行更改，并立即在网络浏览器中查看我的更改。
如何使用heroku执行此操作？
我在Cloud9开发环境中工作，我曾经输入“rails s -p $ PORT -b $ IP”来查看我在应用程序中的更改，但现在当我这样做时，我得到一个“没有数据库错误。“
我尝试使用谷歌搜索，但我仍然感到困惑。如何更改现有应用并在本地查看我的更改（无需推送到源/主）？我以前从未使用过数据库...使用预编程的cloud9，事情才刚刚起作用。我不知道如何为heroku创建一个单独的数据库，如果需要的话。
这是我的database.yml的副本：
# 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
# FOR HEROKU -- POSTGRES DB SETUP
# UNCOMMENT WHEN WORKING LOCALLY.
development:
adapter: postgresql
database: planit_developement
pool: 5
timeout: 5000
test:
adapter: postgresql
database: planit_test
pool: 5
timeout: 5000
# production:
# <<: *default
# database: db/production.sqlite3
以下是我尝试迁移时的完整跟踪：
rake db:migrate --trace
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Execute db:load_config
** Execute db:migrate
rake aborted!
ActiveRecord::NoDatabaseError: FATAL: role "ubuntu" does not exist
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_adapters/postgresql_adapter.rb:665:in `rescue in connect'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_adapters/postgresql_adapter.rb:655:in `connect'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_adapters/postgresql_adapter.rb:242:in `initialize'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_adapters/postgresql_adapter.rb:44:in `new'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_adapters/postgresql_adapter.rb:44:in `postgresql_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:438:in `new_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:448:in `checkout_new_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:422:in `acquire_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:349:in `block in checkout'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:348:in `checkout'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:263:in `block in connection'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:262:in `connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:571:in `retrieve_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_handling.rb:113:in `retrieve_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/connection_handling.rb:87:in `connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/migration.rb:913:in `initialize'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/migration.rb:820:in `new'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/migration.rb:820:in `up'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/migration.rb:798:in `migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:137:in `migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.4/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:240:in `call'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:240:in `block in execute'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:235:in `each'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:235:in `execute'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:179:in `block in invoke_with_call_chain'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:172:in `invoke_with_call_chain'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:165:in `invoke'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:150:in `invoke_task'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:106:in `block (2 levels) in top_level'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:106:in `each'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:106:in `block in top_level'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:115:in `run_with_threads'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:100:in `top_level'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:78:in `block in run'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:176:in `standard_exception_handling'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:75:in `run'
Tasks: TOP => db:migrate