Step.04 models

Manager model

fix app/models/manager.rb

from

class Manager < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable #, :registerable,  #由於管理員不允許被註冊，所以把這段砍掉
        #  :recoverable, :rememberable, :trackable, :validatable
end

to

class Manager < ActiveRecord::Base
  devise :database_authenticatable
end

#### User model

fix app/models/user.rb

from

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
        #  :recoverable, :rememberable, :trackable, :validatable
end

to

class User < ActiveRecord::Base
  devise :database_authenticatable, :registerable
end

#### Item model

注意！！！

如果要用下指令快速建model，model name後面一定要有欄位名字與型態，例如

rails g model Item name:string

如果只打rails g model Item就會噴掉

在此我們不用以往下指令快速建model的方式，使用JC的手刻寫法

我們一樣去paperclip github，看到Models那邊，於是我們給item.rb加上

add app/models/item.rb

class Item < ActiveRecord::Base
  has_attached_file :cover,
      styles: {
        original: "1024x1024>",
        medium: "300x300>",
        thumb: "100x100>"
      },  #style很重要，取決於你要幾張圖片
      default_url: "/images/:style/missing.png"
  validates_attachment_content_type :cover, content_type: /\Aimage\/.*\z/
end

style很重要，取決於你要幾張圖片，RailFun的這篇文章就是在講這個

由於JC忘了在Item加一個分類`cate`所以再寫一個新的migration ``` rails g migration add_item_cate ```

add to db/migrate/XXXXXX_add_item_cate.rb

add_column :items, :cate_id, :integer, :null => false

然後rake db:migrate

接著我們回到`item.rb`，加上 ```rb class Item < ActiveRecord::Base belongs_to :cate

has_attached_file :cover, ... ... end

<br>
#### Cate model

create  `app/models/cate.rb`
```rb
class Cate < ActiveRecord::Base
  has_many :items
end

#### Order model

create app/models/order.rb

class Order < ActiveRecord::Base
  has_many :order_items
end

#### OrderItem model

create app/models/order_item.rb

class OrderItem < ActiveRecord::Base
  belongs_to :item
  belongs_to :user
  belongs_to :order
end

#### 進入console測試剛剛建好的model

rails c

:001 > Order.count
:002 > Order
:003 > Item
:004 > OrderItem
:005 > User
:006 > Manager
:007 > exit

一開始要先count，再下Model Name，這樣就能知道這個table是否存在