rake db：seed NameError：未初始化的常量在rails控制檯中的練習

Question

我正在學習一門課程應用程序來學習語言。我將許多模型遷移爲課程，章節和項目（使用acts_as-active_record gem）。項目是可執行和課，練習和考試是act_as項目。 我創建了一個種子是這樣的：

rails = Course.create(name: "Ruby On Rails") 

models = rails.chapters.create(name: "Models") 

# first item is a lesson 
models.items << Lesson.create(name: "What is Active Record?", content: "Lesson content here") 

# then 2 exos 
models.items << Exercise.create(name: "The Active Record pattern", content: "Exo about active record pattern") 
models.items << Exercise.create(name: "Object Relational Mapping", content: "Exo about ORM") 
models.items << Exercise.create(name: "Active Record as an ORM Framework", content: "Exo about ORM") 

# a second lesson 
models.items << Lesson.create(name: "Convention over Configuration in Active Record", content: "Lesson content here") 

# 3 exos 
models.items << Exercise.create(name: "Naming Conventions", content: "Exo about naming convention") 
models.items << Exercise.create(name: "Schema Conventions", content: "Exo about schema convention") 

# a summary lesson 
models.items << Lesson.create(name: "Model summary", content: "Lesson content here") 

# an exam 
models.items << Exam.create(name: "Rails Models exam", content: "Exam content here") 


# You can go to next course with : next_item = Course.first.chapters.first.items.first.lower_item 
# Then go to next chapter with: next_item.chapter.lower_item 

但在我的rails控制檯耙分貝：種子我有通知 耙中止錯誤！ NameError：未初始化不斷Exercice ../db/seeds.rb:19:in <top (required)>' -e:1:in「 任務：TOP => DB：種子

我真的不知道什麼是錯誤。 也許與acts_as-active_record有關係嗎？

下面是型號：

class Course < ActiveRecord::Base 
has_many :chapters, -> { order(position: :asc) } 
validates_presence_of :title 
end 

class Chapter < ActiveRecord::Base 
acts_as_list scope: :course 
belongs_to :course 
has_many :items, -> { order(position: :asc) } 
validates_presence_of :title 
end 

class Item < ActiveRecord::Base 
actable 
belongs_to :chapter 
acts_as_list scope: :chapter 
validates_presence_of :title 
end 

class Lesson < ActiveRecord::Base 
acts_as :item 
end 

class Exercise < ActiveRecord::Base 
acts_as :item 
end 



class Exam < ActiveRecord::Base 
acts_as :item 
end 

整個種子就在這裏。

Answer 1

類別Exercice和Exercise不匹配。

models.items << Exercice.create(name: "The Active Record pattern", content: "Exo about active record pattern") 

class Exercise < ActiveRecord::Base 
    acts_as :item 
end