Ruby on rails 未初始化的常量SessionHelper（NameError）

我正在做Hartl教程，我的rails应用程序在开发中运行良好，但在heroku中崩溃，错误代码如下：

application_controller.rb:5:in `<class:ApplicationController>': uninitialized constant ApplicationController::SessionsHelper (NameError)

我尝试删除我的旧heroku应用程序，并启动一个新的应用程序来重置迁移（在过去是为了“排除故障”），但这次不起作用。当我运行heroku rake db:migrate时，所有迁移都会显示出来，除了remember digest迁移。我再次运行了db:migrate，但无法将其迁移。以下是迁移：

迁移.db

20150204074511_create_users.rb                  20150204093042_add_phone_number_to_users.rb
20150204081616_add_index_to_users_email.rb      20150204094519_add_index_to_users_phone_number.rb
20150204081750_add_password_digest_to_users.rb  20150207093225_add_remember_digest_to_users.rb

迁移日志

ajhausdorf@rails-tutorial:~/workspace/AccessOBD (master) $ heroku run rake db:migrate
Running `rake db:migrate` attached to terminal... up, run.4474
   (18.0ms)  CREATE TABLE "schema_migrations" ("version" character varying NOT NULL) 
   (8.6ms)  CREATE UNIQUE INDEX  "unique_schema_migrations" ON "schema_migrations"  ("version")
  ActiveRecord::SchemaMigration Load (1.5ms)  SELECT "schema_migrations".* FROM "schema_migrations"
Migrating to CreateUsers (20150204074511)
   (0.9ms)  BEGIN
== 20150204074511 CreateUsers: migrating ======================================
-- create_table(:users)
   (15.1ms)  CREATE TABLE "users" ("id" serial primary key, "name" character varying, "email" character varying, "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL) 
   -> 0.0162s
== 20150204074511 CreateUsers: migrated (0.0164s) =============================

  SQL (1.2ms)  INSERT INTO "schema_migrations" ("version") VALUES ($1)  [["version", "20150204074511"]]
   (4.0ms)  COMMIT
Migrating to AddIndexToUsersEmail (20150204081616)
   (0.8ms)  BEGIN
== 20150204081616 AddIndexToUsersEmail: migrating =============================
-- add_index(:users, :email, {:unique=>true})
   (4.6ms)  CREATE UNIQUE INDEX  "index_users_on_email" ON "users"  ("email")
   -> 0.0081s
== 20150204081616 AddIndexToUsersEmail: migrated (0.0082s) ====================

  SQL (0.9ms)  INSERT INTO "schema_migrations" ("version") VALUES ($1)  [["version", "20150204081616"]]
   (5.5ms)  COMMIT
Migrating to AddPasswordDigestToUsers (20150204081750)
   (0.7ms)  BEGIN
== 20150204081750 AddPasswordDigestToUsers: migrating =========================
-- add_column(:users, :password_digest, :string)
   (1.3ms)  ALTER TABLE "users" ADD "password_digest" character varying
   -> 0.0022s
== 20150204081750 AddPasswordDigestToUsers: migrated (0.0023s) ================

  SQL (0.8ms)  INSERT INTO "schema_migrations" ("version") VALUES ($1)  [["version", "20150204081750"]]
   (1.7ms)  COMMIT
Migrating to AddPhoneNumberToUsers (20150204093042)
   (0.7ms)  BEGIN
== 20150204093042 AddPhoneNumberToUsers: migrating ============================
-- add_column(:users, :phone, :string)
   (1.4ms)  ALTER TABLE "users" ADD "phone" character varying
   -> 0.0023s
== 20150204093042 AddPhoneNumberToUsers: migrated (0.0024s) ===================

  SQL (0.9ms)  INSERT INTO "schema_migrations" ("version") VALUES ($1)  [["version", "20150204093042"]]
   (2.8ms)  COMMIT
Migrating to AddIndexToUsersPhoneNumber (20150204094519)
   (4.4ms)  BEGIN
== 20150204094519 AddIndexToUsersPhoneNumber: migrating =======================
-- add_index(:users, :phone, {:unique=>true})
   (7.5ms)  CREATE UNIQUE INDEX  "index_users_on_phone" ON "users"  ("phone")
   -> 0.0110s
== 20150204094519 AddIndexToUsersPhoneNumber: migrated (0.0111s) ==============

  SQL (0.8ms)  INSERT INTO "schema_migrations" ("version") VALUES ($1)  [["version", "20150204094519"]]
   (4.7ms)  COMMIT

---

有没有理由不进行这种迁移？再次运行db:migrate不会给出任何结果。任何关于你认为问题可能发生在哪里的信息都会有帮助，我找不到任何导致这一问题的信息

我的问题是git没有跟踪我添加的任何会话文件，所以它们在我的本地计算机上，而不是github->heroku上。我发现这一点是因为我只在sessions\u helper上做了一个更改，然后提交到git，只得到一条消息，即没有对任何文件进行更改，但有几个（所有sessions文件）未被跟踪

---

发生这种情况是因为我使用了

git-am“commit message”

而不是

git add-A

第一个bc，我认为-A标志添加了所有内容。应该检查git以确保sessions\u helper.rb在那里，所有的答案都告诉我要检查，但我只是在本地机器上检查。

确保实现

sessionHelper

的文件名为

sessions\u helper.rb

并放在

app/helpers

@MarekLipka中。一切正常。我觉得把助手包括在控制器中不合适。这就是我们所关心的。在你看来，你真的需要

log_in

method吗？@BroiSatse我不知道有什么问题。我正在做的教程告诉我要这样做，也许以后会考虑到另一个地方？我修正了我的错误，请参见下面的答案

20150204074511_create_users.rb                  20150204093042_add_phone_number_to_users.rb
20150204081616_add_index_to_users_email.rb      20150204094519_add_index_to_users_phone_number.rb
20150204081750_add_password_digest_to_users.rb  20150207093225_add_remember_digest_to_users.rb

ajhausdorf@rails-tutorial:~/workspace/AccessOBD (master) $ heroku run rake db:migrate
Running `rake db:migrate` attached to terminal... up, run.4474
   (18.0ms)  CREATE TABLE "schema_migrations" ("version" character varying NOT NULL) 
   (8.6ms)  CREATE UNIQUE INDEX  "unique_schema_migrations" ON "schema_migrations"  ("version")
  ActiveRecord::SchemaMigration Load (1.5ms)  SELECT "schema_migrations".* FROM "schema_migrations"
Migrating to CreateUsers (20150204074511)
   (0.9ms)  BEGIN
== 20150204074511 CreateUsers: migrating ======================================
-- create_table(:users)
   (15.1ms)  CREATE TABLE "users" ("id" serial primary key, "name" character varying, "email" character varying, "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL) 
   -> 0.0162s
== 20150204074511 CreateUsers: migrated (0.0164s) =============================

  SQL (1.2ms)  INSERT INTO "schema_migrations" ("version") VALUES ($1)  [["version", "20150204074511"]]
   (4.0ms)  COMMIT
Migrating to AddIndexToUsersEmail (20150204081616)
   (0.8ms)  BEGIN
== 20150204081616 AddIndexToUsersEmail: migrating =============================
-- add_index(:users, :email, {:unique=>true})
   (4.6ms)  CREATE UNIQUE INDEX  "index_users_on_email" ON "users"  ("email")
   -> 0.0081s
== 20150204081616 AddIndexToUsersEmail: migrated (0.0082s) ====================

  SQL (0.9ms)  INSERT INTO "schema_migrations" ("version") VALUES ($1)  [["version", "20150204081616"]]
   (5.5ms)  COMMIT
Migrating to AddPasswordDigestToUsers (20150204081750)
   (0.7ms)  BEGIN
== 20150204081750 AddPasswordDigestToUsers: migrating =========================
-- add_column(:users, :password_digest, :string)
   (1.3ms)  ALTER TABLE "users" ADD "password_digest" character varying
   -> 0.0022s
== 20150204081750 AddPasswordDigestToUsers: migrated (0.0023s) ================

  SQL (0.8ms)  INSERT INTO "schema_migrations" ("version") VALUES ($1)  [["version", "20150204081750"]]
   (1.7ms)  COMMIT
Migrating to AddPhoneNumberToUsers (20150204093042)
   (0.7ms)  BEGIN
== 20150204093042 AddPhoneNumberToUsers: migrating ============================
-- add_column(:users, :phone, :string)
   (1.4ms)  ALTER TABLE "users" ADD "phone" character varying
   -> 0.0023s
== 20150204093042 AddPhoneNumberToUsers: migrated (0.0024s) ===================

  SQL (0.9ms)  INSERT INTO "schema_migrations" ("version") VALUES ($1)  [["version", "20150204093042"]]
   (2.8ms)  COMMIT
Migrating to AddIndexToUsersPhoneNumber (20150204094519)
   (4.4ms)  BEGIN
== 20150204094519 AddIndexToUsersPhoneNumber: migrating =======================
-- add_index(:users, :phone, {:unique=>true})
   (7.5ms)  CREATE UNIQUE INDEX  "index_users_on_phone" ON "users"  ("phone")
   -> 0.0110s
== 20150204094519 AddIndexToUsersPhoneNumber: migrated (0.0111s) ==============

  SQL (0.8ms)  INSERT INTO "schema_migrations" ("version") VALUES ($1)  [["version", "20150204094519"]]
   (4.7ms)  COMMIT