我無法弄清一些奇怪的行爲,即時進入里亞爾控制檯,而我測試了一些代碼。Rails has_many外鍵產生空陣列
我的型號如下:
profile.rb
class Profile < ActiveRecord::Base
belongs_to :user
belongs_to :company
attr_accessible :first_name, :last_name
validates :first_name, presence: true
validates :last_name, presence: true
end
company.rb
class Company < ActiveRecord::Base
has_many :employees, :foreign_key => 'company_id', :class_name => "Profile"
attr_accessible :name
validates :name, presence: true, length: { maximum: 50 }, uniqueness: true
end
我進入軌道控制檯
$rails c --sandbox
,然後測試以下代碼
:001 > company = Company.find(2)
Company Load (4.2ms) SELECT "companies".* FROM "companies" WHERE "companies"."id" = ? LIMIT 1 [["id", 2]]
=> #<Company id: 2, name: "Jet Star", created_at: "2012-06-24 04:12:50", updated_at: "2012-06-24 04:12:50">
:002 > employee = Profile.find(5)
Profile Load (0.1ms) SELECT "profiles".* FROM "profiles" WHERE "profiles"."id" = ? LIMIT 1 [["id", 5]]
=> #<Profile id: 5, user_id: 5, first_name: "Douglas", last_name: "Reed", created_at: "2012-06-17 15:05:58", updated_at: "2012-06-17 15:05:58", deleted: false, company_id: nil>
:003 > employee.company = company
=> #<Company id: 2, name: "Jet Star", created_at: "2012-06-24 04:12:50", updated_at: "2012-06-24 04:12:50">
:004 > employee.company
=> #<Company id: 2, name: "Jet Star", created_at: "2012-06-24 04:12:50", updated_at: "2012-06-24 04:12:50">
:005 > employee
=> #<Profile id: 5, user_id: 5, first_name: "Douglas", last_name: "Reed", created_at: "2012-06-17 15:05:58", updated_at: "2012-06-17 15:05:58", deleted: false, company_id: 2>
:006 > company.employees
Profile Load (0.2ms) SELECT "profiles".* FROM "profiles" WHERE "profiles"."company_id" = 2
=> []
:007 > Profile.find_by_company_id(2)
Profile Load (0.2ms) SELECT "profiles".* FROM "profiles" WHERE "profiles"."company_id" = 2 LIMIT 1
=> nil
:008 > employee.save
(0.1ms) SAVEPOINT active_record_1
(0.4ms) UPDATE "profiles" SET "company_id" = 2, "updated_at" = '2012-06-24 07:35:14.525138' WHERE "profiles"."id" = 5
(0.0ms) RELEASE SAVEPOINT active_record_1
=> true
:009 > company.employees
=> []
:010 > Profile.find_by_company_id(2)
Profile Load (0.2ms) SELECT "profiles".* FROM "profiles" WHERE "profiles"."company_id" = 2 LIMIT 1
=> #<Profile id: 5, user_id: 5, first_name: "Douglas", last_name: "Reed", created_at: "2012-06-17 15:05:58", updated_at: "2012-06-24 07:35:14", deleted: false, company_id: 2>
如果你看看簡介記錄它顯示的company_id,但是當你做員工(配置文件)與ID沒有搜索返回。
那麼爲什麼company.employees不會返回一個列表?
中我是否需要這樣做我的控制器,或者這是隻需要在控制檯? –
如果所有相同的代碼都在一個控制器中,那麼是的,您必須重新加載公司實例,以便從數據庫中獲得正確的信息。 – lee