使用Rails 4.2.1。我有一个带有枚举字段的模型:
def create
user = User.find_by(email: user_params[:email])
if user && user.authenticate(user_params[:password])
session[:current_user_id] = user.id
flash[:message] = "Thanks for loggin in " + user.first_name
else
flash[:message] = "Username or Password combo are not correct"
end
redirect_to root_path
end
在控制器中,我试图保存模型:
class MyModel < ActiveRecord::Base
enum my_enum: { first_value: 0, second_value: 1 }
validates_presence_of :my_id, :username, :my_enum
end
这给了我my_model = MyModel.find_or_initialize_by(my_id: my_id)
my_model.update(username: username, my_enum: :first_value)
。
在保存之前将所需属性分配给对象,如下所示:
Validation failed: My enum can't be blank
甚至
my_model.username = username
my_model.first_value!
产生相同的结果。
这是否意味着my_model.username = username
my_model.my_enum = 0
my_model.save!
不能与枚举一起使用?如果情况确实如此,那么根本原因是什么?
答案 0 :(得分:2)
这不是错误。问题是my_enum
列的类型为string
,我试图保存一个整数。替换
enum my_enum: { first_value: 0, second_value: 1 }
带
enum my_enum: { first_value: '0', second_value: '1' }
修复了问题,更改列也修复了它。
显然,使用字符串作为枚举是/是“秘密的未记录的功能”。有关其他详细信息,请参阅this pull request(在撰写本文时仍然开放)。
答案 1 :(得分:1)
我看到validates_presence_of
仍然适用于枚举。这是我的模特
# production.rb
class Production < ActiveRecord::Base
enum status: {active: 1, deactive: 0}
validates_presence_of :status
end
我在rails console
案例1:
2.2.0 :001 > Production.create!
(0.1ms) begin transaction
(0.1ms) rollback transaction
ActiveRecord::RecordInvalid: Validation failed: Status can't be blank
案例2:
2.2.0 :001 > prod = Production.find_or_initialize_by(title: "abc")
Production Load (0.8ms) SELECT "productions".* FROM "productions" WHERE "productions"."title" = ? LIMIT 1 [["title", "abc"]]
=> #<Production id: nil, title: "abc", price: nil, description: nil, status: nil, created_at: nil, updated_at: nil>
2.2.0 :002 > prod.update(price: 23, status: :active)
(0.3ms) begin transaction
SQL (0.8ms) INSERT INTO "productions" ("title", "price", "status", "created_at", "updated_at") VALUES (?, ?, ?, ?, ?) [["title", "abc"], ["price", 23], ["status", 1], ["created_at", "2015-11-04 05:58:43.851364"], ["updated_at", "2015-11-04 05:58:43.851364"]]
(0.7ms) commit transaction
=> true
案例3:
2.2.0 :001 > prod = Production.find_or_initialize_by(title: "def")
Production Load (0.6ms) SELECT "productions".* FROM "productions" WHERE "productions"."title" = ? LIMIT 1 [["title", "def"]]
=> #<Production id: nil, title: "def", price: nil, description: nil, status: nil, created_at: nil, updated_at: nil>
2.2.0 :002 > prod.description = "bla"
=> "bla"
2.2.0 :003 > prod.save!
(0.2ms) begin transaction
(0.1ms) rollback transaction
ActiveRecord::RecordInvalid: Validation failed: Status can't be blank
案例4:
2.2.0 :001 > prod = Production.find_or_initialize_by(title: "def")
Production Load (0.6ms) SELECT "productions".* FROM "productions" WHERE "productions"."title" = ? LIMIT 1 [["title", "def"]]
=> #<Production id: nil, title: "def", price: nil, description: nil, status: nil, created_at: nil, updated_at: nil>
2.2.0 :002 > prod.status = 0
=> 0
2.2.0 :003 > prod.save!
(0.2ms) begin transaction
SQL (0.8ms) INSERT INTO "productions" ("title", "status", "created_at", "updated_at") VALUES (?, ?, ?, ?) [["title", "def"], ["status", 0], ["created_at", "2015-11-04 06:01:16.391026"], ["updated_at", "2015-11-04 06:01:16.391026"]]
(0.7ms) commit transaction
=> true
我使用的是Rails 4.2.4。