新对象归属不会与创建它的设计用户关联
当我的用户创建一个应该有他的 id 的对象时，id 会出现 nil。想法为什么？
# controllers/units_controller.rb
class UnitsController < ApplicationController
before_filter :authenticate_user!
def new
@unit = Unit.new
@unit.user = current_user # also tried .user_id = current_user.id
[...]
# models/unit.rb
class Unit < ActiveRecord::Base
belongs_to :user
# :user has_many :units too
[...]
该对象已成功保存，但 user_id 字段为空（显示 nil）。 没有抛出异常。保存时没有回调。
When my user creates an object that should have his id on it, the id comes out nil. Ideas why?
# controllers/units_controller.rb
class UnitsController < ApplicationController
before_filter :authenticate_user!
def new
@unit = Unit.new
@unit.user = current_user # also tried .user_id = current_user.id
[...]
# models/unit.rb
class Unit < ActiveRecord::Base
belongs_to :user
# :user has_many :units too
[...]
The object is saved successfully, but with an empty user_id field (showing nil).
No exception is thrown. There is no callback on save.
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如果您在标准 Rails 两步（#new (POST)-> #create）中执行此操作，则需要在 #create 操作中将 Unit 与 current_user 关联起来。
If you're doing this in the standard Rails two step (#new (POST)-> #create), then you need to associate Unit with current_user in the #create action.