activerecord - 表少模型协会

Question

我一直在尝试在前端实现关联，但由于目前应用程序没有与网站直接连接的任何数据库，因此我们不能使用 ActiveRecord，只能使用 ActiveModel 来支持验证和核心功能一个模型。现在，由于我们需要使用将与对象一起发送的嵌套属性，即与用户关联的地址，因此为此我们需要首先在相应的模型上定义关联。但是在定义关联后，它会在用户模型上抛出未定义方法“has_many”的异常。我目前正在寻找在我们的网站中实现它的方法，并实现嵌套属性的逻辑。
如果您能向我提出与此相关的任何建议，或者您过去曾遇到过此类问题，那就太好了。
我也尝试过使用 gem https://github.com/softace/activerecord-tableless 的方法但不适合我。我还添加了一个 tableless.rb

无表文件

class Tableless < ActiveRecord::Base     
  def self.column(name, sql_type = nil, default = nil, null = true)
    columns << ActiveRecord::ConnectionAdapters::Column.new( name.to_s, default, sql_type.to_s, null )
  end

  def self.columns()
    @columns ||= [];
  end

  def self.columns_hash
    h = {}
    for c in self.columns
    h[c.name] = c
    end
    return h
  end

  def self.column_defaults
    Hash[self.columns.map{ |col|
    [col.name, col.default]
    }]
  end
  def self.descends_from_active_record?
    return true
  end
  def persisted?
    return false
  end
# override the save method to prevent exceptions
end

但得到以下异常异常:

控制台错误:

ActiveRecord::ConnectionNotEstablished: ActiveRecord::ConnectionNotEstablished
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:546:in `retrieve_connection'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/activerecord-4.0.0/lib/active_record/connection_handling.rb:79:in `retrieve_connection'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/activerecord-4.0.0/lib/active_record/connection_handling.rb:53:in `connection'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/activerecord-4.0.0/lib/active_record/model_schema.rb:203:in `table_exists?'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/activerecord-4.0.0/lib/active_record/attribute_methods/primary_key.rb:92:in `get_primary_key'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/activerecord-4.0.0/lib/active_record/attribute_methods/primary_key.rb:77:in `reset_primary_key'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/activerecord-4.0.0/lib/active_record/attribute_methods/primary_key.rb:65:in `primary_key'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/activerecord-4.0.0/lib/active_record/attribute_methods/primary_key.rb:79:in `reset_primary_key'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/activerecord-4.0.0/lib/active_record/attribute_methods/primary_key.rb:65:in `primary_key'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/activerecord-4.0.0/lib/active_record/attribute_methods/write.rb:32:in `write_attribute'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/activerecord-4.0.0/lib/active_record/attribute_methods/dirty.rb:70:in `write_attribute'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/activerecord-4.0.0/lib/active_record/attribute_methods/write.rb:19:in `__temp__9646='
    from /home/cis/API_OTGJ/Tableless/app/models/book.rb:13:in `block in initialize'
    from /home/cis/API_OTGJ/Tableless/app/models/book.rb:12:in `each'
    from /home/cis/API_OTGJ/Tableless/app/models/book.rb:12:in `initialize'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/activerecord-4.0.0/lib/active_record/inheritance.rb:27:in `new'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/activerecord-4.0.0/lib/active_record/inheritance.rb:27:in `new'
    from (irb):19
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/railties-4.0.0/lib/rails/commands/console.rb:90:in `start'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/railties-4.0.0/lib/rails/commands/console.rb:9:in `start'
    from /home/cis/.rvm/gems/ruby-2.0.0-p0@website/gems/railties-4.0.0/lib/rails/commands.rb:64:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

Answer 1

好像忘记调用方法了

has_no_table

在您的模型上，根据 https://github.com/softace/activerecord-tableless#usage .在他们的例子中:

class ContactMessage < ActiveRecord::Base
  has_no_table
  column :name, :string
  column :email, :string
  validates_presence_of :name, :email
end

希望这可以帮助。 =)