scaffold後のmigrateでのエラー(rails)

Question

Rails 4.2.5
gem 2.5.1

最近ruby on rails を学び始めた初心者です。
scaffoldでgenerateした後に、rake db:migarateしたら以下のようなエラーが返ってきました。
以前にはこのようなエラーはなかったので対処法がわからず困惑しています。
何か解決法がありましたらご教授お願いいたします。

エラーメッセージ

CreateMembers: migrating ====================================
-- create_table(:members)
-- mail()
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

undefined local variable or method mail' for #<CreateMembers:0x007fa5270706d8>/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:664:in block in method_missing'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:634:in block in say_with_time' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:634:in say_with_time'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:654:in method_missing' /Users/user/rails_projects/sciencetools/db/migrate/20151223225837_create_members.rb:5:in block in change'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/connection_adapters/abstract/schema_statements.rb:202:in create_table' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:665:in block in method_missing'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:634:in block in say_with_time' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:634:in say_with_time'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:654:in method_missing' /Users/user/rails_projects/sciencetools/db/migrate/20151223225837_create_members.rb:3:in change'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:608:in exec_migration' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:592:in block (2 levels) in migrate'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:591:in block in migrate' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in with_connection'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:590:in migrate' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:768:in migrate'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:998:in block in execute_migration_in_transaction' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:1044:in block in ddl_transaction'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in block in transaction' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/connection_adapters/abstract/transaction.rb:184:in within_new_transaction'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in transaction' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/transactions.rb:220:in transaction'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:1044:in ddl_transaction' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:997:in execute_migration_in_transaction'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:959:in block in migrate' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:955:in each'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:955:in migrate' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:823:in up'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/migration.rb:801:in migrate' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/tasks/database_tasks.rb:137:in migrate'
/Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.5/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace

Answer 1

どのようなコマンドでgenerateされたのかはわかりませんが、コマンド入力の時にtypoでもあったのではないでしょうか。
エラーメッセージに問題の箇所が提示されているので、そのファイルの中身を見て、何が問題なのか見てみると良いかと。

/Users/user/rails_projects/sciencetools/db/migrate/20151223225837_create_members.rb:5:inblock in change'

このファイルの記述がエラーを引き起こしているようですから、ここをチェックされると良いでしょう。

Comments

[begincode]

やはり、ファイルの記述が間違っていたようです。
とても助かりました。
ありがとうございました。