Rails seed.rb can'；找不到架构和SQL中存在的表

类是一个保留字，因此我已将表名从

Class\u赋值

更改为

cassignments

，以避免这可能是导致它的错误（尽管我有

Class\u指令）

。我尝试了复数和单数版本，但仍然得到了错误。

cassignments

表是

作业

和

class\u指令

之间多对多关系的中间表

模式：

ActiveRecord::Schema.define(:version => 20130524160107) do

  create_table "assignments", :force => true do |t|
    t.string   "name"
    t.string   "fractionRepresentations"
    ....etc...
    t.datetime "created_at",                  :null => false
    t.datetime "updated_at",                  :null => false
  end

  create_table "cassiggnments", :force => true do |t|
    t.integer  "class_instruction_id"
    t.integer  "assignment_id"
    t.datetime "created_at",           :null => false
    t.datetime "updated_at",           :null => false
  end

  add_index "cassiggnments", ["assignment_id"], :name => "index_class_assignment_on_assignment_id"
  add_index "cassiggnments", ["class_instruction_id"], :name => "index_class_assignment_on_class_instruction_id"

  create_table "class_instructions", :force => true do |t|
    t.string   "name"
    t.datetime "time"
    t.datetime "created_at", :null => false
    t.datetime "updated_at", :null => false
    t.integer  "person_id"
  end

  add_index "class_instructions", ["person_id"], :name => "index_class_instructions_on_person_id"

  ....etc....

end

正在尝试在seed.rb中为db设置种子

# ClassInstruction Assignment
  cia1 = Cassignment.create({ class_instruction_id: 4, assignment_id: 1 }, :without_protection => true ).save!

我得到了一个错误：

rake aborted!
Could not find table 'cassignments'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.2/lib/active_record/connection_adapters/sqlite_adapter.rb:465:in `table_structure'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.2/lib/active_record/connection_adapters/sqlite_adapter.rb:346:in `columns'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.2/lib/active_record/connection_adapters/schema_cache.rb:12:in `block in initialize'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.2/lib/active_record/model_schema.rb:228:in `yield'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.2/lib/active_record/model_schema.rb:228:in `default'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.2/lib/active_record/model_schema.rb:228:in `columns'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.2/lib/active_record/model_schema.rb:243:in `column_defaults'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.2/lib/active_record/base.rb:479:in `initialize'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.2/lib/active_record/persistence.rb:44:in `new'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.2/lib/active_record/persistence.rb:44:in `create'
/Users/special/dev/SoundOfFractions/db/seeds.rb:83:in `<top (required)>'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activesupport-3.2.2/lib/active_support/dependencies.rb:245:in `load'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activesupport-3.2.2/lib/active_support/dependencies.rb:245:in `block in load'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activesupport-3.2.2/lib/active_support/dependencies.rb:236:in `load_dependency'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activesupport-3.2.2/lib/active_support/dependencies.rb:245:in `load'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/railties-3.2.2/lib/rails/engine.rb:520:in `load_seed'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.2/lib/active_record/railties/databases.rake:309:in `block (2 levels) in <top (required)>'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:246:in `call'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:246:in `block in execute'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:241:in `each'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:241:in `execute'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:184:in `block in invoke_with_call_chain'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:205:in `block in invoke_prerequisites'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:203:in `each'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:203:in `invoke_prerequisites'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:183:in `block in invoke_with_call_chain'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:170:in `invoke'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.2/lib/active_record/railties/databases.rake:252:in `block (2 levels) in <top (required)>'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:246:in `call'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:246:in `block in execute'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:241:in `each'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:241:in `execute'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:184:in `block in invoke_with_call_chain'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/task.rb:170:in `invoke'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/application.rb:143:in `invoke_task'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/application.rb:101:in `block (2 levels) in top_level'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/application.rb:101:in `each'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/application.rb:101:in `block in top_level'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/application.rb:110:in `run_with_threads'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/application.rb:95:in `top_level'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/application.rb:73:in `block in run'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/application.rb:160:in `standard_exception_handling'
/Users/special/.rvm/gems/ruby-1.9.3-p362/gems/rake-10.0.4/lib/rake/application.rb:70:in `run'
/Users/special/.rvm/gems/ruby-1.9.3-p362/bin/ruby_noexec_wrapper:14:in `eval'
/Users/special/.rvm/gems/ruby-1.9.3-p362/bin/ruby_noexec_wrapper:14:in `<main>'
Tasks: TOP => db:setup => db:seed

---

命名多元化与其他多对多关系表和种子结构相匹配，但我不知道哪里出了问题，只知道种子文件找不到根据sqlite浏览器存在的表，并且正确地称为

cassignments

（复数）.

这是一种

拥有且属于多个
关系还是
拥有多个：通过
关系

仅限HABTM:
在前一种情况下，您不需要模型，表名必须是按字母顺序排列的两个连接表名。
assignments\u class\u instructions

在这两种情况下，创建联接的正确方法是将一个类的实例添加到另一个类的实例，而不是直接创建联接

class_instruction = ClassInstruction.find(4)
class_instruction.assignments << Assignment.find(1)

class_指令=ClassInstruction.find（4）
class_instruction.assignments您已经创建了一个名为cassiggnments的表，其中有两个'g's
HMT，那么为什么
ur2=UserRole.create（{:user\u id=>2，：role\u id=>2}，：without\u protection=>true）.save！
work？抱歉@chrisFrisina我不是想暗示它不起作用，但这不一定是正确的方法。没问题，只是想让你的工作方式也一样……很高兴作为一个开发人员学习约定
class_instruction = ClassInstruction.find(4)
class_instruction.assignments << Assignment.find(1)