Ruby on rails RubyonRails使用名称空间保存记录

我正在使用Rails 5.1构建一个应用程序，我正在尝试在名称空间中组织模型，但是当我尝试保存一个实例时，我得到了一个错误：没有这样的表：main.users也许这里有人可以告诉我方法

app/models/frontend.rb

我正在使用Desive进行用户迁移这是前端：：用户模型 app/models/frontend/user.rb

前端迁移：：事件模型：

我可以使用has_many:events关系的构建方法

e = u.events.build

 <Frontend::Event id: nil, user_id: 1, title: nil, description: 
 nil, short_description: nil, start_date: nil, end_date: nil, address: 
 nil, latitude: nil, longitude: nil, number_of_guest: nil, published: 
 false, created_at: nil, updated_at: nil>

---

我认为rails惯例存在一些问题。据我所知，您应该以一种特殊的方式命名联接表

您可以查看rails指南，特别是在部分中查找

按照指南，我可以建造更多更少的你正在建设的东西，但没有设计

在这个例子中，我有三个迁移

class CreateFrontendUsers < ActiveRecord::Migration[5.1]
  def change
    create_table :frontend_users do |t|
      t.string :email

      t.timestamps
    end
  end
end

class CreateFrontendEvents < ActiveRecord::Migration[5.1]
  def change
    create_table :frontend_events do |t|
      t.string :name

      t.timestamps
    end
  end
end

class CreateFrontendEventsUsersJoinTable < ActiveRecord::Migration[5.1]
  def change
    create_table :frontend_events_users, id: false do |t|
      t.integer :event_id
      t.integer :user_id
    end

    add_index :frontend_events_users, :event_id
    add_index :frontend_events_users, :user_id
  end
end

现在你的模特会像

class Frontend::Event < ApplicationRecord
  has_many :event_invitations
  has_many :users, through: :event_invitations
end

class Frontend::User < ApplicationRecord
  has_many :event_invitations
  has_many :events, through: :event_invitations
end

class Frontend::EventInvitation < ApplicationRecord
  belongs_to :user
  belongs_to :event
end

我总是喜欢用这种联想，而不是用“有很多”和“属于”联想。但你可以决定哪个对你更有利=

有时很难了解所有rails约定，即使您已经使用rails几年了。。。但是，这项研究提供了很多帮助

---

我希望这会有帮助=

当然，谢谢，这在一定程度上起到了作用，但这让工作变得更加困难。我是编程新手，我会坚持约定而不是配置，但我认为这对我来说是有用的，所以我把它放在一边，这样我就可以学习如何在rails应用程序中正确使用名称空间。再次感谢您抽出时间提供帮助。我添加了一个使用has\u many:through association的示例。如果您是Rails领域的新手，也许您可以阅读一下，看看是否更适合您的用例=

class CreateFrontendEvents < ActiveRecord::Migration[5.1]
 def change
  create_table :frontend_events do |t|
   t.references :user, foreign_key: true
   t.string :title, :null => false
   t.text :description, :null => false
   t.string :short_description, :null => false
   t.datetime :start_date, :null => true
   t.datetime :end_date, :null => true
   t.string :address, :null => true
   t.float :latitude, :null => true
   t.float :longitude, :null => true
   t.integer :number_of_guest, :null => true
   t.boolean :published, default: false
   t.timestamps
  end
 end
end

u = Frontend::User.create(email: "user@user.com", password: "secret")

e = u.events.build

 <Frontend::Event id: nil, user_id: 1, title: nil, description: 
 nil, short_description: nil, start_date: nil, end_date: nil, address: 
 nil, latitude: nil, longitude: nil, number_of_guest: nil, published: 
 false, created_at: nil, updated_at: nil>

ActiveRecord::StatementInvalid (SQLite3::SQLException: no such table: 
main.users: INSERT INTO "frontend_events" ("user_id", 
"created_at","updated_at") VALUES (?, ?, ?))

class CreateFrontendUsers < ActiveRecord::Migration[5.1]
  def change
    create_table :frontend_users do |t|
      t.string :email

      t.timestamps
    end
  end
end

class CreateFrontendEvents < ActiveRecord::Migration[5.1]
  def change
    create_table :frontend_events do |t|
      t.string :name

      t.timestamps
    end
  end
end

class CreateFrontendEventsUsersJoinTable < ActiveRecord::Migration[5.1]
  def change
    create_table :frontend_events_users, id: false do |t|
      t.integer :event_id
      t.integer :user_id
    end

    add_index :frontend_events_users, :event_id
    add_index :frontend_events_users, :user_id
  end
end

class Frontend::Event < ApplicationRecord
  has_and_belongs_to_many :users
end

class Frontend::User < ApplicationRecord
  has_and_belongs_to_many :events
end

user = Frontend::User.create(email: "asdf")
event = user.events.create(name: "event1")
user.events # => #<ActiveRecord::Associations::CollectionProxy [#<Frontend::Event id: 1, name: "event1", created_at: "...", updated_at: "...">]>
event.users # => #<ActiveRecord::Associations::CollectionProxy [#<Frontend::User id: 1, email: "asdf", created_at: "...", updated_at: "...">]>

class CreateFrontendEventInvitations < ActiveRecord::Migration[5.1]
  def change
    create_table :frontend_event_invitations do |t|
      t.integer :event_id
      t.integer :user_id

      t.timestamps
    end

    add_index :frontend_event_invitations, :event_id
    add_index :frontend_event_invitations, :user_id
  end
end

class Frontend::Event < ApplicationRecord
  has_many :event_invitations
  has_many :users, through: :event_invitations
end

class Frontend::User < ApplicationRecord
  has_many :event_invitations
  has_many :events, through: :event_invitations
end

class Frontend::EventInvitation < ApplicationRecord
  belongs_to :user
  belongs_to :event
end