rails db:migrate in Procfile 导致应用程序在 Heroku 中崩溃

Question

当我包含web: rails:db:migrate在我的 Procfile 中时，它会使我的 rails 应用程序崩溃。当我rails db:migrate通过浏览器使用 Heroku 控制台运行时，它工作得很好。

2018-01-20T08:01:30.465226+00:00 heroku[web.1]: Starting process with command `rails db:migrate`

2018-01-20T08:01:34.612837+00:00 app[web.1]: I, [2018-01-20T08:01:34.206214 #4]  INFO -- : [SKYLIGHT] [1.5.0] Skylight agent enabled

2018-01-20T08:01:34.612854+00:00 app[web.1]: D, [2018-01-20T08:01:34.576132 #4] DEBUG -- :   [1m[35m (1.0ms)[0m  [1m[34mSELECT pg_try_advisory_lock(8624398319468495445)[0m

2018-01-20T08:01:34.612855+00:00 app[web.1]: D, [2018-01-20T08:01:34.589800 #4] DEBUG -- :   [1m[35m (1.5ms)[0m  [1m[34mSELECT "schema_migrations"."version" FROM "schema_migrations" ORDER BY "schema_migrations"."version" ASC[0m

2018-01-20T08:01:34.612857+00:00 app[web.1]: D, [2018-01-20T08:01:34.597079 #4] DEBUG -- :   [1m[36mActiveRecord::InternalMetadata Load (1.2ms)[0m  [1m[34mSELECT  "ar_internal_metadata".* FROM "ar_internal_metadata" WHERE "ar_internal_metadata"."key" = $1 LIMIT $2[0m  [["key", "environment"], ["LIMIT", 1]]

2018-01-20T08:01:34.612858+00:00 app[web.1]: D, [2018-01-20T08:01:34.604685 #4] DEBUG -- :   [1m[35m (1.0ms)[0m  [1m[35mBEGIN[0m

2018-01-20T08:01:34.612859+00:00 app[web.1]: D, [2018-01-20T08:01:34.606578 #4] DEBUG -- :   [1m[35m (1.0ms)[0m  [1m[35mCOMMIT[0m

2018-01-20T08:01:34.612860+00:00 app[web.1]: D, [2018-01-20T08:01:34.607768 #4] DEBUG -- :   [1m[35m (1.0ms)[0m  [1m[34mSELECT pg_advisory_unlock(8624398319468495445)[0m

2018-01-20T08:01:34.692625+00:00 heroku[web.1]: State changed from starting to crashed

2018-01-20T08:01:34.670371+00:00 heroku[web.1]: Process exited with status 0

Answer 1

在Procfile,web用于网络服务器，例如：

web: bundle exec puma -C config/puma.rb

为了在部署到 Heroku 时运行迁移，您需要将此行附加到Procfile：

release: rake db:migrate