問題DBをHerokuに移行する - PG :: UndefinedTable：ERROR：relation "users"が存在しません

Question

私は2つの異なるdbs、sqlite in productionとpostgresqlをプロダクションで使用しています。

私の問題は、dbを変更した後も常に英雄に移行することを忘れることに関連していると思います。 herokuで移行する前におそらくローカルで4〜5回の移行を行ったでしょう。だからとにかく、問題は、私がheroku run rails db:migrateを調整すると、確かに開発中ですが、PG::UndefinedTable: ERROR: relation "users" does not existというエラーが出ます。私は以下のすべての必要な情報を試してみます。欠けているものがあれば教えてください。

schema.rb

# This file is auto-generated from the current state of the database. Instead 
# of editing this file, please use the migrations feature of Active Record to 
# incrementally modify your database, and then regenerate this schema definition. 
# 
# Note that this schema.rb definition is the authoritative source for your 
# database schema. If you need to create the application database on another 
# system, you should be using db:schema:load, not running all the migrations 
# from scratch. The latter is a flawed and unsustainable approach (the more migrations 
# you'll amass, the slower it'll run and the greater likelihood for issues). 
# 
# It's strongly recommended that you check this file into your version control system. 

ActiveRecord::Schema.define(version: 20161011053831) do 

    create_table "comments", force: :cascade do |t| 
    t.integer "user_id" 
    t.text  "body" 
    t.datetime "created_at", null: false 
    t.datetime "updated_at", null: false 
    t.integer "post_id" 
    t.index ["post_id"], name: "index_comments_on_post_id" 
    t.index ["user_id"], name: "index_comments_on_user_id" 
    end 

    create_table "posts", force: :cascade do |t| 
    t.string "title" 
    t.text  "body" 
    t.datetime "created_at", null: false 
    t.datetime "updated_at", null: false 
    end 

    create_table "users", force: :cascade do |t| 
    t.string "first_name" 
    t.string "last_name" 
    t.datetime "created_at",       null: false 
    t.datetime "updated_at",       null: false 
    t.string "email",     default: "", null: false 
    t.string "encrypted_password",  default: "", null: false 
    t.string "reset_password_token" 
    t.datetime "reset_password_sent_at" 
    t.datetime "remember_created_at" 
    t.integer "sign_in_count",   default: 0, null: false 
    t.datetime "current_sign_in_at" 
    t.datetime "last_sign_in_at" 
    t.string "current_sign_in_ip" 
    t.string "last_sign_in_ip" 
    t.index ["email"], name: "index_users_on_email", unique: true 
    t.index ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true 
    end 

end 

の端子出力

Running rails db:migrate on ⬢ [retracted]... up, run.1231 (Free) 
D, [2016-10-11T06:15:07.562673 #3] DEBUG -- : (0.8ms) SELECT pg_try_advisory_lock(6976026441189414000); 
D, [2016-10-11T06:15:07.572811 #3] DEBUG -- : ActiveRecord::SchemaMigration Load (1.0ms) SELECT "schema_migrations".* FROM "schema_migrations" 
I, [2016-10-11T06:15:07.577534 #3] INFO -- : Migrating to CreateComments (20160928024026) 
D, [2016-10-11T06:15:07.579481 #3] DEBUG -- : (0.7ms) BEGIN 
== 20160928024026 CreateComments: migrating =================================== 
-- create_table(:comments) 
D, [2016-10-11T06:15:07.594892 #3] DEBUG -- : (13.9ms) CREATE TABLE "comments" ("id" serial primary key, "user_id" integer, "body" text, "blog_post_id" integer, "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL, CONSTRAINT "fk_rails_03de2dc08c" 
FOREIGN KEY ("user_id") 
    REFERENCES "users" ("id") 
, CONSTRAINT "fk_rails_29c545254e" 
FOREIGN KEY ("blog_post_id") 
    REFERENCES "blog_posts" ("id") 
) 
D, [2016-10-11T06:15:07.595917 #3] DEBUG -- : (0.7ms) ROLLBACK 
D, [2016-10-11T06:15:07.597131 #3] DEBUG -- : (0.9ms) SELECT pg_advisory_unlock(6976026441189414000) 
rails aborted! 
StandardError: An error has occurred, this and all later migrations canceled: 

PG::UndefinedTable: ERROR: relation "users" does not exist 
: CREATE TABLE "comments" ("id" serial primary key, "user_id" integer, "body" text, "blog_post_id" integer, "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL, CONSTRAINT "fk_rails_03de2dc08c" 
FOREIGN KEY ("user_id") 
    REFERENCES "users" ("id") 
, CONSTRAINT "fk_rails_29c545254e" 
FOREIGN KEY ("blog_post_id") 
    REFERENCES "blog_posts" ("id") 
) 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:98:in `async_exec' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:98:in `block in execute' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract_adapter.rb:566:in `block in log' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract_adapter.rb:560:in `log' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:97:in `execute' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/schema_statements.rb:283:in `create_table' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:845:in `block in method_missing' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:814:in `block in say_with_time' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:814:in `say_with_time' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:834:in `method_missing' 
/app/db/migrate/20160928024026_create_comments.rb:3:in `change' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:788:in `exec_migration' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:772:in `block (2 levels) in migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:771:in `block in migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:398:in `with_connection' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:770:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:950:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1211:in `block in execute_migration_in_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1279:in `block in ddl_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:232:in `block in transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/transaction.rb:189:in `within_new_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:232:in `transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/transactions.rb:211:in `transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1279:in `ddl_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1210:in `execute_migration_in_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1183:in `block in migrate_without_lock' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1182:in `each' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1182:in `migrate_without_lock' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1131:in `block in migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1298:in `with_advisory_lock' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1131:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1005:in `up' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:983:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/tasks/database_tasks.rb:161:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/railties/databases.rake:58:in `block (2 levels) in <top (required)>' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-5.0.0.1/lib/rails/commands/rake_proxy.rb:13:in `block in run_rake_task' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-5.0.0.1/lib/rails/commands/rake_proxy.rb:10:in `run_rake_task' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:51:in `run_command!' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-5.0.0.1/lib/rails/commands.rb:18:in `<top (required)>' 
/app/bin/rails:9:in `require' 
/app/bin/rails:9:in `<main>' 
ActiveRecord::StatementInvalid: PG::UndefinedTable: ERROR: relation "users" does not exist 
: CREATE TABLE "comments" ("id" serial primary key, "user_id" integer, "body" text, "blog_post_id" integer, "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL, CONSTRAINT "fk_rails_03de2dc08c" 
FOREIGN KEY ("user_id") 
    REFERENCES "users" ("id") 
, CONSTRAINT "fk_rails_29c545254e" 
FOREIGN KEY ("blog_post_id") 
    REFERENCES "blog_posts" ("id") 
) 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:98:in `async_exec' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:98:in `block in execute' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract_adapter.rb:566:in `block in log' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract_adapter.rb:560:in `log' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:97:in `execute' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/schema_statements.rb:283:in `create_table' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:845:in `block in method_missing' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:814:in `block in say_with_time' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:814:in `say_with_time' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:834:in `method_missing' 
/app/db/migrate/20160928024026_create_comments.rb:3:in `change' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:788:in `exec_migration' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:772:in `block (2 levels) in migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:771:in `block in migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:398:in `with_connection' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:770:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:950:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1211:in `block in execute_migration_in_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1279:in `block in ddl_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:232:in `block in transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/transaction.rb:189:in `within_new_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:232:in `transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/transactions.rb:211:in `transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1279:in `ddl_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1210:in `execute_migration_in_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1183:in `block in migrate_without_lock' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1182:in `each' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1182:in `migrate_without_lock' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1131:in `block in migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1298:in `with_advisory_lock' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1131:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1005:in `up' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:983:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/tasks/database_tasks.rb:161:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/railties/databases.rake:58:in `block (2 levels) in <top (required)>' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-5.0.0.1/lib/rails/commands/rake_proxy.rb:13:in `block in run_rake_task' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-5.0.0.1/lib/rails/commands/rake_proxy.rb:10:in `run_rake_task' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:51:in `run_command!' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-5.0.0.1/lib/rails/commands.rb:18:in `<top (required)>' 
/app/bin/rails:9:in `require' 
/app/bin/rails:9:in `<main>' 
PG::UndefinedTable: ERROR: relation "users" does not exist 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:98:in `async_exec' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:98:in `block in execute' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract_adapter.rb:566:in `block in log' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract_adapter.rb:560:in `log' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:97:in `execute' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/schema_statements.rb:283:in `create_table' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:845:in `block in method_missing' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:814:in `block in say_with_time' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:814:in `say_with_time' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:834:in `method_missing' 
/app/db/migrate/20160928024026_create_comments.rb:3:in `change' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:788:in `exec_migration' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:772:in `block (2 levels) in migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:771:in `block in migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:398:in `with_connection' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:770:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:950:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1211:in `block in execute_migration_in_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1279:in `block in ddl_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:232:in `block in transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/transaction.rb:189:in `within_new_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:232:in `transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/transactions.rb:211:in `transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1279:in `ddl_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1210:in `execute_migration_in_transaction' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1183:in `block in migrate_without_lock' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1182:in `each' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1182:in `migrate_without_lock' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1131:in `block in migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1298:in `with_advisory_lock' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1131:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1005:in `up' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:983:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/tasks/database_tasks.rb:161:in `migrate' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-5.0.0.1/lib/active_record/railties/databases.rake:58:in `block (2 levels) in <top (required)>' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-5.0.0.1/lib/rails/commands/rake_proxy.rb:13:in `block in run_rake_task' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-5.0.0.1/lib/rails/commands/rake_proxy.rb:10:in `run_rake_task' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:51:in `run_command!' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-5.0.0.1/lib/rails/commands.rb:18:in `<top (required)>' 
/app/bin/rails:9:in `require' 
/app/bin/rails:9:in `<main>' 
Tasks: TOP => db:migrate 
(See full trace by running task with --trace) 

私が漂って他のいくつかの解決策を試してみたが、何もこれまで働いていません。ありがとう！

Answer 1

そのようなテーブルはまだありませんので、あなたがusers前commentsテーブルを作成しているように見えます、そしてcommentsテーブルにuser_id外部キーを使用しながら、それが失敗します。

マイグレーションが正しく注文されていることを確認します（ユーザー、コメント）。

通常、最初にテーブル/カラムを作成し、作成して移行した後にのみ参照する必要があります。