Ruby-on-rails ActiveAdmin 有 has_many 问题；未定义的方法'new_record？'
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ActiveAdmin with has_many problem; undefined method 'new_record?'
提问by nickpellant
I'm trying to customise a ActiveAdmin form for a Recipe model that has a has_many relationship with Step.
我正在尝试为与 Step 具有 has_many 关系的 Recipe 模型自定义 ActiveAdmin 表单。
class Recipe < ActiveRecord::Base
has_many :steps
end
class Step < ActiveRecord::Base
acts_as_list :scope => :recipe
belongs_to :recipe
end
I have the following in my ActiveAdmin file with relation to this:
我的 ActiveAdmin 文件中有与此相关的以下内容：
form do |f|
f.has_many :steps do |ing_f|
ing_f.inputs
end
end
The following error is thrown when I try to load the form:
当我尝试加载表单时抛出以下错误：
undefined method `new_record?' for nil:NilClass
未定义的方法“new_record?” 对于零：NilClass
I've isolated it so far to the has_many method but I'm lost past this. Any advice and help would be appreciated!
到目前为止，我已经将它隔离到 has_many 方法，但我已经迷失了这一点。任何建议和帮助将不胜感激！
回答by Dan Gurgui
go to your Recipe model and add the following line
转到您的配方模型并添加以下行
accepts_nested_attributes_for :steps
The line is required by formtastic, not active admin. Check https://github.com/justinfrench/formtasticfor formtastic documentation
该行是 formtastic 所必需的，而不是活动管理员所必需的。检查https://github.com/justinfrench/formtastic以获取 formtastic 文档
回答by user5439847
class Recipe < ActiveRecord::Base
attr_accessible :step_attributes
has_many :steps
accepts_nested_attributes_for :steps
end
