我正在运行bundle exec rake db:create，然后 bundle exec rake db:migrate` 并且在迁移时遇到了这个错误：
bundle exec rake db:migrate
== 20110125192211 InitialDigitizationWork: migrating ==========================
-- create_table(:digitizations)
-> 0.0170s
-- add_index(:digitizations, :submission_code, {:unique=>true})
-> 0.0156s
-- create_table(:digitized_pieces)
-> 0.0180s
-- add_index(:digitized_pieces, :digitization_id)
-> 0.0113s
-- create_table(:digitized_views)
-> 0.0235s
-- add_index(:digitized_views, :digitized_piece_id, {:null=>false})
rake aborted!
StandardError: An error has occurred, all later migrations canceled:
Unknown key: :null. Valid keys are: :unique, :order, :name, :where, :length, :internal, :using, :algorithm,
这是我第一次使用Mysql（我用过Postgresql）我似乎有Mysql：
mysql -u root
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 31
Server version: 5.7.20 Homebrew
这是我的database.yml文件：
development:
adapter: mysql2
database: arthouse_dev
username: root
password:
host: localhost
port: 3306
#socket: /tmp/mysql.sock
legacy_development:
adapter: mysql2
database: arthouse_leg_development
username: root
password:
host: localhost
port: 3306
我相信这只是一个错误，您不能拥有null: false索引。
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我来说两句