我正在尝试在 Ruby 中设置 Sequel。我去了http://sequel.rubyforge.org/rdoc/files/doc/migration_rdoc.html并创建了我的第一个迁移。然后我让 Postgres.app 作为我的服务器运行,并做了一个 createdb Qsario。当我尝试使用迁移来创建数据库字段时,问题就来了:
$sequel -E -m . postgres://localhost/Qsario
I, [2012-07-08T13:53:49.659795 #6258] INFO -- : (0.000374s) SET standard_conforming_strings = ON
I, [2012-07-08T13:53:49.660113 #6258] INFO -- : (0.000153s) SET client_min_messages = 'WARNING'
I, [2012-07-08T13:53:49.660359 #6258] INFO -- : (0.000163s) SET DateStyle = 'ISO'
I, [2012-07-08T13:53:49.664679 #6258] INFO -- : (0.000952s) SELECT NULL FROM "schema_info" LIMIT 1
I, [2012-07-08T13:53:49.665179 #6258] INFO -- : (0.000214s) SELECT * FROM "schema_info" LIMIT 1
I, [2012-07-08T13:53:49.665544 #6258] INFO -- : (0.000166s) SELECT 1 AS "one" FROM "schema_info" LIMIT 1
I, [2012-07-08T13:53:49.666100 #6258] INFO -- : (0.000325s) SELECT COUNT(*) AS "count" FROM "schema_info" LIMIT 1
I, [2012-07-08T13:53:49.666461 #6258] INFO -- : (0.000179s) SELECT "version" FROM "schema_info" LIMIT 1
Error: NoMethodError: undefined method `Migration' for Sequel:Module/Users/me/Projects/Qsario/db/migrate/001_create_user_and_file_tables.rb:3:in `<top (required)>'
这是 001_create_user_and_file_tables.rb 的样子:
Sequel.Migration do
no_transaction
change do
create_table(:users) do
primary_key :id
String :username, :unique=>true
String :email, :unique=>true
String :password_hash
String :password_salt
DateTime :joined_at, :null => false
FalseClass :banned, default=>false
String :role, default=>"user"
end
create_table(:files) do
primary_key :id
foreign_key :user_id, :users
String :filename, :null => false
DateTime :uploaded_at, :null => false
end
create_table(:users_files) do
primary_key :id
foreign_key :user_id, :users
foreign_key :file_id, :files
end
end
end
请注意,还没有 Rakefile 或类似的东西,因为我仍在尝试设置。我没有使用 Rails。所以那个 .rb 文件是目录中唯一的东西。