Question

任何一个志愿者为什么下面的课程会失败？

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

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

我确信解决方案很简单。我认为它应该“按原样”运作：

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

是的，Sequel::Model.plugin(:schema)也为我工作。在文档中看不到它，我为什么感到困惑，因为我有另一个使用set_schema而没有大惊小怪的工作项目。

未找到续集模型set_schema

3 个答案: