ruby-on-rails - 如何更新rails中的 bool 值

Question

我正在尝试在创建stay 期间将runn 的occupied 字段更新为true .

def create
    if params[:id].present?
      @patient = Patient.find(params[:id])
      @stay = @patient.stays.build(stay_params)
      @stay.is_current = true
      Runn.find_by_id(@stay.runn_id).update_attribute(:occupied, true)
    else
      @stay = Stays.new(stay_params)
    end
    if @stay.save
      redirect_to @patient
    end
  end

这是我的 stays_controller.rb 中的创建方法

class Stay < ActiveRecord::Base
  belongs_to :patient
  has_one :runn
  has_many :feeding_events
  has_many :ud_events
  has_many :misc_stay_events

  after_create :update
  private
    def update
        self.check_in_dt = Time.new
        self.is_current = true
    end
end

这是stay.rb

class Runn < ActiveRecord::Base

  belongs_to :ward
  belongs_to :stay

end

这是runn.rb

当我用控制台显示所有的时候，它们都显示occupied是false，这是有道理的，因为我在seeds中就是这样设置的。但是，我想知道如何更新 occupied？当我这样做时:

[1] pry(main)> Runn.find_by_id(1)
  Runn Load (0.5ms)  SELECT  "runns".* FROM "runns" WHERE "runns"."id" = $1 LIMIT 1  [["id", 1]]
=> #<Runn:0x007f478460d6c8
 id: 1,
 ident: "Run 0.0",
 size: "Medium,",
 amenities: nil,
 created_at: Thu, 03 Dec 2015 05:50:01 UTC +00:00,
 updated_at: Thu, 03 Dec 2015 05:50:01 UTC +00:00,
 ward_id: 1,
 occupied: false>
[2] pry(main)> Runn.find_by_id(1).occupied = true
  Runn Load (0.6ms)  SELECT  "runns".* FROM "runns" WHERE "runns"."id" = $1 LIMIT 1  [["id", 1]]
=> true
[3] pry(main)> Runn.find_by_id(1)
  Runn Load (0.5ms)  SELECT  "runns".* FROM "runns" WHERE "runns"."id" = $1 LIMIT 1  [["id", 1]]
=> #<Runn:0x007f478467a6b0
 id: 1,
 ident: "Run 0.0",
 size: "Medium,",
 amenities: nil,
 created_at: Thu, 03 Dec 2015 05:50:01 UTC +00:00,
 updated_at: Thu, 03 Dec 2015 05:50:01 UTC +00:00,
 ward_id: 1,
 occupied: false>
[4] pry(main)> 

已占用 尚未更新。但是，使用 update_attribute:

[4] pry(main)> Runn.find_by_id(1).update_attribute(:occupied, true)
  Runn Load (0.4ms)  SELECT  "runns".* FROM "runns" WHERE "runns"."id" = $1 LIMIT 1  [["id", 1]]
   (0.2ms)  BEGIN
  SQL (0.4ms)  UPDATE "runns" SET "occupied" = $1, "updated_at" = $2 WHERE "runns"."id" = $3  [["occupied", "t"], ["updated_at", "2015-12-03 05:52:33.949456"], ["id", 1]]
   (11.0ms)  COMMIT
=> true
[5] pry(main)> Runn.find_by_id(1)
  Runn Load (0.5ms)  SELECT  "runns".* FROM "runns" WHERE "runns"."id" = $1 LIMIT 1  [["id", 1]]
=> #<Runn:0x007f479d0fd098
 id: 1,
 ident: "Run 0.0",
 size: "Medium,",
 amenities: nil,
 created_at: Thu, 03 Dec 2015 05:50:01 UTC +00:00,
 updated_at: Thu, 03 Dec 2015 05:52:33 UTC +00:00,
 ward_id: 1,
 occupied: true>
[6] pry(main)> Runn.all
  Runn Load (0.6ms)  SELECT "runns".* FROM "runns"
=> [#<Runn:0x007f479d0aafa0
  id: 2,
  ident: "Run 0.1",
  size: "Small,",
  amenities: nil,
  created_at: Thu, 03 Dec 2015 05:50:01 UTC +00:00,
  updated_at: Thu, 03 Dec 2015 05:50:01 UTC +00:00,
  ward_id: 1,
  occupied: false>,
 #<Runn:0x007f479d0aae60
  id: 3,
  ident: "Run 1.0",
  size: "Small,",
  amenities: nil,
  created_at: Thu, 03 Dec 2015 05:50:01 UTC +00:00,
  updated_at: Thu, 03 Dec 2015 05:50:01 UTC +00:00,
  ward_id: 2,
  occupied: false>,
 #<Runn:0x007f479d0aad20
  id: 4,
  ident: "Run 1.1",
  size: "Medium,",
  amenities: nil,

已成功更新，但已从 Runn.all 中删除。有什么建议吗？

编辑:

[1] pry(main)> Runn.all
  Runn Load (0.8ms)  SELECT "runns".* FROM "runns"
=> [#<Runn:0x007f4784e9b3a8
  id: 1,
  ident: "Run 0.0",
  size: "Medium,",
  amenities: nil,
  created_at: Thu, 03 Dec 2015 05:59:02 UTC +00:00,
  updated_at: Thu, 03 Dec 2015 05:59:02 UTC +00:00,
  ward_id: 1,
  occupied: false>,
 #<Runn:0x007f4784e98a40
  id: 2,
  ident: "Run 0.1",
  size: "Small,",
  amenities: nil,
  created_at: Thu, 03 Dec 2015 05:59:02 UTC +00:00,
  updated_at: Thu, 03 Dec 2015 05:59:02 UTC +00:00,
  ward_id: 1,
  occupied: false>,
 #<Runn:0x007f4784e98900
  id: 3,
  ident: "Run 1.0",
  size: "Small,",
  amenities: nil,

原始 Runn.all。

Answer 1

请尝试更新:

runn = Runn.find_by_id(1)
if !runn.nil?
  runn.occupied = true
  runn.save
end