Javascript 如何在一个表单中包含两个模型？

一个模型创建：name、：metric（Quantified.rb），另一个模型创建：result\u value、：result\u date（result.rb）

class{where（类别：'月平均'）}
作用域：实例，->{where（类别：“一次性实例”）}
有很多：结果
类别=['月平均值'，'一次实例']
结束
类结果结束

您试图做的是嵌套属性您可以阅读更多关于它的信息

示例：

# creates avatar_attributes=
accepts_nested_attributes_for :avatar, reject_if: proc { |attributes| attributes['name'].blank? }
# creates avatar_attributes=
accepts_nested_attributes_for :avatar, reject_if: :all_blank
# creates avatar_attributes= and posts_attributes=
accepts_nested_attributes_for :avatar, :posts, allow_destroy: true

这是类定义

# File activerecord/lib/active_record/nested_attributes.rb, line 301
def accepts_nested_attributes_for(*attr_names)
  options = { :allow_destroy => false, :update_only => false }
  options.update(attr_names.extract_options!)
  options.assert_valid_keys(:allow_destroy, :reject_if, :limit, :update_only)
  options[:reject_if] = REJECT_ALL_BLANK_PROC if options[:reject_if] == :all_blank

  attr_names.each do |association_name|
    if reflection = _reflect_on_association(association_name)
      reflection.autosave = true
      add_autosave_association_callbacks(reflection)

      nested_attributes_options = self.nested_attributes_options.dup
      nested_attributes_options[association_name.to_sym] = options
      self.nested_attributes_options = nested_attributes_options

      type = (reflection.collection? ? :collection : :one_to_one)
      generate_association_writer(association_name, type)
    else
      raise ArgumentError, "No association found for name `#{association_name}'. Has it been defined yet?"
    end
  end
end

另外，如果您需要更多，rails cast会提供一个非常酷的视频来解释这一点