ruby-on-rails-4 - Ruby on Rails + Amoeba Gem：未定义的方法“宏”

Question

我在 Rails 控制台（使用 Ruby 2.1）中尝试了变形虫 2.0.0 版。这是我的模型：

class Dict < ActiveRecord::Base
  belongs_to :user
  has_many :cards, dependent: :destroy
  has_many :idioms, through: :cards
end
class Card < ActiveRecord::Base
  belongs_to :dict
  has_many :idioms, dependent: :destroy
  amoeba do
    exclude_field :dict_id
  end
end
class Idiom < ActiveRecord::Base
  belongs_to :card
  amoeba do
    include_field :repres
    include_field :card_id
    include_field :kind
    include_field :note
  end
end

现在在 Rails 控制台中我尝试

c=Card.find_by_id(19) # yields a Card object
c.amoeba_dup

这引发了异常

NoMethodError: undefined method macro' for nil:NilClass
from .../amoeba-2.0.0/lib/amoeba.rb:412:in amo_process_association'
from .../amoeba-2.0.0/lib/amoeba.rb:381:in block in amoeba_dup'
from .../amoeba-2.0.0/lib/amoeba.rb:379:in each'
from ..../amoeba-2.0.0/lib/amoeba.rb:379:in amoeba_dup'
from .../amoeba-2.0.0/lib/amoeba.rb:457:in block in amo_process_association'

我在哪里做错了？

Answer 1

这个问题也在 GitHub 上被问到：When using amoeba_dub : undefined method for NilClass

它是由于include_field被用于非关联的东西而引起的。不要那样做！为避免日后出现歧义，include_field改名为include_association.