ActiveRecord 在保存/更新时不更新脏属性。创建确定。可能的继承问题

Question

我有一个使用单表继承的类结构如下：

CashAccount > AssetAccount > FinancialAccount

相关控制器代码：

def create
  @financial_account = FinancialAccount.new(financial_account_params)
  respond_to do |format|
    if @financial_account.save
      format.html { redirect_to @financial_account, notice: 'Account was successfully created.' }
    else
      format.html { render :new }
    end
  end
end

def update
  respond_to do |format|
    if @financial_account.update(financial_account_params)
      format.html { redirect_to @financial_account, notice: 'Account was successfully updated.' }
    else
      format.html { render :edit }
    end
  end
end

  def set_financial_account
    @financial_account = FinancialAccount.find_by_id(params[:id])
    unless @financial_account 
      redirect_to root_path, :flash => { :alert => "That Account does not exist." }
      return
    end       
  end

def update_params
  params.require(@financial_account.model_name.param_key)
        .permit(:name, :type, :description)
end

def create_params
  params.require(:financial_account)
        .permit(:name, :type, :description)
end

创作作品。更新没有。没有错误。保存返回 true 但值永远不会改变。以下是在对象更新时调试状态的一些 put：

puts @financial_account.changed? //false
@financial_account.assign_attributes(financial_account_params)
puts @financial_account.changed? //true
@financial_account.description_will_change!
puts @financial_account.changed? //true
puts @financial_account.description //New Value 1
puts @financial_account.save //true
puts @financial_account.description //Old Value
puts @financial_account.update(:description => "New Value 2") //true
puts @financial_account.description //Old Value
@financial_account.description = "New Value 3"
puts @financial_account.description //New Value 3
puts @financial_account.save //true
puts @financial_account.description //Old Value

Description 是 FinancialAccount 类的简单文本属性：

  create_table "financial_accounts", id: :uuid, default: "uuid_generate_v4()", force: :cascade do |t|
    ...
    t.text     "description"
    ...
  end

部分 to_yaml 打印出@financial_account 以查看用户的储值：

delegate_hash:
  name: !ruby/object:ActiveRecord::Attribute::FromUser
    name: name
    value_before_type_cast: Test Account
    type: *1
    value: Test Account
  description: !ruby/object:ActiveRecord::Attribute::FromUser
    name: description
    value_before_type_cast: New Value 1
    type: *1
    value: New Value 1

数据库是PostgreSQL

更新 - DjezzzL 请求的输出

注意：这是一个多租户应用程序，所以我需要设置业务 ID

2.2.4 :001 > Business.current_id = 1
 => 1 
2.2.4 :002 > tmp = FinancialAccount.first
  FinancialAccount Load (0.6ms)  SELECT  "financial_accounts".* FROM "financial_accounts" WHERE "financial_accounts"."business_id" = $1  ORDER BY "financial_accounts"."id" ASC LIMIT 1  [["business_id", 1]]
 => #<RetainedEarningsAccount id: "0a282a84-2561-4820-8f21-b8063c1c2604", type: "RetainedEarningsAccount", name: "Owner's Retained Earnings", created_at: "2017-05-02 05:20:22", updated_at: "2017-05-02 05:20:22", description: "Old Value", business_id: 1, update_balance_flag: false, reference_number: "11", balance_cents: 0> 
2.2.4 :003 > tmp.description = 'new value'
 => "new value" 
2.2.4 :004 > p tmp.save
   (0.2ms)  BEGIN
  FinancialAccount Exists (1.0ms)  SELECT  1 AS one FROM "financial_accounts" WHERE ("financial_accounts"."reference_number" = '11' AND "financial_accounts"."id" != '0a282a84-2561-4820-8f21-b8063c1c2604' AND "financial_accounts"."business_id" = 1) LIMIT 1
  RetainedEarningsAccount Load (0.3ms)  SELECT  "financial_accounts".* FROM "financial_accounts" WHERE "financial_accounts"."type" IN ('RetainedEarningsAccount') AND "financial_accounts"."id" = $1 LIMIT 1  [["id", "0a282a84-2561-4820-8f21-b8063c1c2604"]]
   (0.2ms)  COMMIT
true
 => true 
2.2.4 :005 > p tmp.description
"Old Value"
 => "Old Value" 
2.2.4 :006 > p tmp.reload.description
  RetainedEarningsAccount Load (2.1ms)  SELECT  "financial_accounts".* FROM "financial_accounts" WHERE "financial_accounts"."type" IN ('RetainedEarningsAccount') AND "financial_accounts"."id" = $1 LIMIT 1  [["id", "0a282a84-2561-4820-8f21-b8063c1c2604"]]
"Old Value"
 => "Old Value"

注意：我的属性被标记为脏，所以不是重复的 ActiveRecord not saving after updating attribute

Answer 1

def create
  @financial_account = FinancialAccount.new(create_params)
  respond_to do |format|
    if @financial_account.save
      format.html { redirect_to @financial_account, notice: 'Account was successfully created.' }
    else
      format.html { render :new }
    end
  end
end

def update
  respond_to do |format|
    if @financial_account.update(update_params)
      format.html { redirect_to @financial_account, notice: 'Account was successfully updated.' }
    else
      format.html { render :edit }
    end
  end
end

private

def create_params
  params.require(@financial_account.model_name.param_key)
        .permit(:name, :type, :description)
end

def update_params
  params.require(:financial_account)
        .permit(:name, :type, :description)
end

使用ActiveModel::Naming#param_key 获取多态模型的参数键。同样在这种情况下，最好使用两种单独的方法进行白名单，因为它可以减少代码路径的数量。