Ruby on rails 使用复选框标记的未初始化常量有很多：尽管

我从“@Collection.components.include？”的复选框标记中得到错误“uninitialized constant Collection:：CollectionComponent”，我不确定为什么会发生这种情况，因为@Collection在标签的形式中似乎工作得很好，或者我是否删除了复选框标记

\u form.html.haml

= form_for @collection do |f|
  - if @collection.errors.any?
    #error_explanation
      %h1= "#{pluralize(@collection.errors.count, "error")} prohibited this collection from being saved:"
      %ul
        - @collection.errors.full_messages.each do |msg|
          %li= msg

  .field
    - Component.all.each do |component|
      = label_tag :component_ids, component.id
      = check_box_tag :component_ids, component.id, @collection.components.include?(component), :name => 'collection[component_ids][]'
  .field
    = f.label :title
    = f.text_field :title
  .actions
    = f.submit 'Save'

collection.rb

class Collection < ActiveRecord::Base
  default_scope order('id ASC')

  attr_accessible         :style_id, 
                          :name, 
                          :title,
                          :component

  has_many                :collection_components, :dependent => :destroy
  has_many                :components, :through => :collection_components

  belongs_to              :style

  validates_presence_of   :style
  validates_presence_of   :title

  before_save             :create_name

  private

  def create_name
    self.name = title.parameterize
  end
end

class Component < ActiveRecord::Base
  default_scope order('id ASC')

  attr_accessible         :category_id, 
                          :name, 
                          :title,
                          :collection,
                          :style

  has_many                :collection_components, :dependent => :destroy
  has_many                :collections,   :through => :collection_components

  has_many                :component_styles
  has_many                :styles,        :through => :component_styles

  belongs_to              :category

  validates_presence_of   :category
  validates_presence_of   :title

  before_save             :create_name

  private

  def create_name
    self.name = title.parameterize
  end
end

class CollectionComponents < ActiveRecord::Base
  attr_accessible :collection_id, 
                  :component_id

  belongs_to      :collection
  belongs_to      :component
end

类集合：销毁
有多个：组件，：到=>：集合\u组件
属于：风格
验证是否存在：样式
验证是否存在：title
保存前：创建\u名称
私有的
def创建_名称
self.name=title.parameterize
结束
结束

组件.rb

class Collection < ActiveRecord::Base
  default_scope order('id ASC')

  attr_accessible         :style_id, 
                          :name, 
                          :title,
                          :component

  has_many                :collection_components, :dependent => :destroy
  has_many                :components, :through => :collection_components

  belongs_to              :style

  validates_presence_of   :style
  validates_presence_of   :title

  before_save             :create_name

  private

  def create_name
    self.name = title.parameterize
  end
end

class Component < ActiveRecord::Base
  default_scope order('id ASC')

  attr_accessible         :category_id, 
                          :name, 
                          :title,
                          :collection,
                          :style

  has_many                :collection_components, :dependent => :destroy
  has_many                :collections,   :through => :collection_components

  has_many                :component_styles
  has_many                :styles,        :through => :component_styles

  belongs_to              :category

  validates_presence_of   :category
  validates_presence_of   :title

  before_save             :create_name

  private

  def create_name
    self.name = title.parameterize
  end
end

class CollectionComponents < ActiveRecord::Base
  attr_accessible :collection_id, 
                  :component_id

  belongs_to      :collection
  belongs_to      :component
end

class组件：销毁
有多个：集合，：到=>：集合\u组件
有很多：组件样式
有许多：样式，：至=>：组件\u样式
属于：类别
验证是否存在：类别
验证是否存在：title
保存前：创建\u名称
私有的
def创建_名称
self.name=title.parameterize
结束
结束

收集组件。rb

class Collection < ActiveRecord::Base
  default_scope order('id ASC')

  attr_accessible         :style_id, 
                          :name, 
                          :title,
                          :component

  has_many                :collection_components, :dependent => :destroy
  has_many                :components, :through => :collection_components

  belongs_to              :style

  validates_presence_of   :style
  validates_presence_of   :title

  before_save             :create_name

  private

  def create_name
    self.name = title.parameterize
  end
end

class Component < ActiveRecord::Base
  default_scope order('id ASC')

  attr_accessible         :category_id, 
                          :name, 
                          :title,
                          :collection,
                          :style

  has_many                :collection_components, :dependent => :destroy
  has_many                :collections,   :through => :collection_components

  has_many                :component_styles
  has_many                :styles,        :through => :component_styles

  belongs_to              :category

  validates_presence_of   :category
  validates_presence_of   :title

  before_save             :create_name

  private

  def create_name
    self.name = title.parameterize
  end
end

class CollectionComponents < ActiveRecord::Base
  attr_accessible :collection_id, 
                  :component_id

  belongs_to      :collection
  belongs_to      :component
end

class CollectionComponents

Rails正在寻找一个名为

CollectionComponent

的类，但您只提供了一个名为

CollectionComponents

的类，为什么我使用了“CollectionComponents”时它在寻找“CollectionComponent”在对模型的所有引用中，这是关于Rails需要了解的事情之一：当您使用复数形式，如“has\u many:component\u styles”时，Rails假定其名称为singluar。因为它更自然：“它有许多组件样式，它们由类ComponentStyle的对象组成”这是有道理的。我将模型“CollectionComponents”更改为“CollectionComponent”，现在收到一个DB错误：ActiveRecord:：StatementInvalid-PG:：error:错误：列引用“id”不明确第1行：…on_id”为NULL，“components”。“id”“=1按id ASC LIM排序的订单^我猜这是因为我一开始就错误地生成了模型？我不理解你的对象设计，所以我不能帮你。。看来你应该有一个has_并且属于许多协会，也许读一下这篇文章会有所帮助？事实上，在我看来，他们使用的例子正是你所需要的。