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問題將數據庫遷移到Heroku - PG :: UndefinedTable：錯誤：關係「users」不存在

2016-10-11 55 views
1

對於初學者，我使用了兩個不同的dbs，開發中的sqlite和生產中的postgresql。問題將數據庫遷移到Heroku - PG :: UndefinedTable：錯誤：關係「users」不存在

我認爲這個問題與忘記在更改我的db之後不斷遷移到heroku有關。在使用heroku進行遷移之前，我可能在本地進行了四次或五次遷移。所以無論如何，問題是，當我tun heroku run rails db:migrate我得到一個錯誤，說PG::UndefinedTable: ERROR: relation "users" does not exist，雖然在開發中，它肯定會。我會嘗試附上下面的所有必要信息。讓我知道是否有遺漏。

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

端子輸出

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)

我已經嘗試了一些其他的解決辦法左右浮動，但沒有到目前爲止已經奏效。謝謝！

來源

2016-10-11 jamesemcc

回答

2

看起來你在創建comments表之前users，而使用user_id外鍵在comments表中它失敗了，因爲目前還沒有這樣的表。

確保您的遷移順序正確（用戶，然後評論）。

而且一般情況下，您應該始終先創建表格/列，並且只有在創建並遷移後才參考它們。

來源

2016-10-11 06:48:08

+0

謝謝安德烈，我看了一下，我看到你在說什麼。我不確定如何重新排序我的遷移？這涉及到更改文件名中的時間戳嗎？ – jamesemcc

+0

@jamesemcc是的，改變文件名稱中的時間戳將完美的工作。但一定要回滾數據庫，或者，如果沒有重要的數據，你可以放棄它。 1.'rake db：drop' 2.重新排序遷移3.'rake db：create && rake db：migrate' –

+0

好的，我有機會試試。與我爲時間戳更改的確切時間有很大關係，還是主要是爲了保持秩序？ – jamesemcc

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