ruby - 未找到续集模型 set_schema

Question

任何人都可以自愿为什么以下课程失败？

... src/model/user.rb:18: undefined method `set_schema' for User:Class (NoMethodError)

我查看了 Sequel-3.0 lib/ 文件夹，该set_schema方法在ClassMethods模块中定义。

我确信解决方案很简单。我在想它应该“按原样”工作：

require 'sequel'

class User < Sequel::Model(:user)

  set_schema do
    set_primary_key :id
    String          :name
  end 
end 

Answer 1

推荐方式...

LOGGER = Object.new()
def LOGGER.method_missing( name, args )
    puts "[#{name}] #{args}"
end

Sequel::Model.plugin(:schema)                       # I worked this out, but I can't find it documented

DB = Sequel.sqlite('sql_test.db', :loggers => [LOGGER] )

unless  DB.table_exists?( :user ) 
    DB.create_table :user  do
        set_primary_key :id
        String          :name
        String          :password
        String          :eMail
    end #create_table
end #table exists
class User < Sequel::Model(:user)

Answer 2

答案是调用插件进行模式管理。即。

require 'sequel'
require 'logger'

LOGGER = Object.new()
def LOGGER.method_missing( name, args )
    puts "[#{name}] #{args}"
end

**Sequel::Model.plugin(:schema)**            # I still didn't find this documented

DB = Sequel.sqlite('sql_test.db', :loggers => [LOGGER] )


class User < Sequel::Model(:user)

  set_schema do
    set_primary_key :id
    String          :name
  end 
end 

Answer 3

Sequel::Model.plugin(:schema)是的也为我工作。在文档中看不到它，我很困惑为什么，因为我有另一个工作项目可以set_schema毫不费力地使用。