0

我收到以下错误：

无法批量分配受保护的属性：管理员、学生

当我使用以下seed.rb文件运行rake db:seed命令时：

roles = [
    Admin: 'Unlimited Access',
    Student: 'Default user role for each user created by sign-in interface.'
]

roles.each do |role, description|
  SecurityUsersRole.find_or_create_by_role_and_description(role,description)
end

我的模型看起来像：

class SecurityUsersRole < ActiveRecord::Base

  # Accessible columns
  attr_accessible :description,
                  :role

  # Relationships
  ...

  # Validations
  validates :description, presence: true, length: { in: 4..32 }, uniqueness: true
  validates :role, length: {  maximum: 256 }, presence: true

end

我已经阅读了很多关于此的内容，似乎对于最新的 Rails 版本，如果关闭Mass Assignment以防止黑客像这样攻击：

def signup
  params[:user] # => {:name => “ow3ned”, :admin => true}
  @user = User.new(params[:user])
end

有很多关于这个的问题，答案总是将 attr_accessible 设置为字段，但我已经这样做了。

编辑：

如果我使用以下语法（{}而不是[]），则添加第一对：

roles = {
    Admin: 'Unlimited Access',
    Student: 'Default user role for each user created by sign-in interface.'
}

如果我这样做，什么都不会改变：

SecurityUsersRole.find_or_create_by_role_and_description('Admin','Unlimited Access')
SecurityUsersRole.find_or_create_by_role_and_description('Student','Default user role for each user created by sign-in interface.')

经过一番阅读，find_or_create_by 助手似乎 在 Rails 4.0中被贬低了。我正在使用 Rails 3.2，但也决定尝试其他技术：

roles = {
    Admin: 'Unlimited Access',
    Student: 'Default user role for each user created by sign-in interface.',
    Test:'wtf'
}

roles.each do |role, description|
  SecurityUsersRole.where(role:role,description:description).first_or_create
  #puts role
  #puts description
end

上面的语句仍然只创​​建第一条记录。我决定在 rails 控制台中执行该语句，这是我得到的输出：

  SecurityUsersRole Load (5.0ms)  SELECT security_users_roles.* FROM security_users_roles WHERE security_users_roles.role = 'Admin' AND security_users_roles.description = 'Unlimited Access' FETCH FIRST ROW ONLY
  SecurityUsersRole Load (3.0ms)  SELECT security_users_roles.* FROM security_users_roles WHERE security_users_roles.role = 'Student' AND security_users_roles.description = 'Default user role for each user created by sign-in interface.' FETCH FIRST ROW ONLY
  SecurityUsersRole Exists (1.0ms)  SELECT 1 AS one FROM security_users_roles WHERE security_users_roles.description = 'Default user role for each user created by sign-in interface.' FETCH FIRST ROW ONLY
  SecurityUsersRole Load (1.0ms)  SELECT security_users_roles.* FROM security_users_roles WHERE security_users_roles.role = 'Test' AND security_users_roles.description = 'wtf' FETCH FIRST ROW ONLY
  SecurityUsersRole Exists (1.0ms)  SELECT 1 AS one FROM security_users_roles WHERE security_users_roles.description = 'wtf' FETCH FIRST ROW ONLY
=> {:Admin=>"Unlimited Access", :Student=>"Default user role for each user created by sign-in interface.", :Test=>"wtf"}

我无法理解到底发生了什么，但从控制台选择所有用户只返回第一个。那么，如果搜索其他角色，为什么不创建它们，因为它们不存在？

谁能建议我可以尝试什么？

4

1 回答 1

0

该问题是由我的模型验证规则引起的，其中

  # Validations
  validates :description, presence: true, length: { in: 4..32 }, uniqueness: true
  validates :role, length: {  maximum: 256 }, presence: true

应该

  # Validations
  validates :role, presence: true, length: { in: 4..32 }, uniqueness: true
  validates :description, length: {  maximum: 256 }, presence: true

我更改了:role和:description字段的位置。因此，rake db:seed命令插入第一条记录，但第二条记录出现错误并且插入被中止。结果是我总是导入第一条记录。

为了在使用种子时获得验证错误，您应该使用 !method 版本，如下所示：

SecurityUsersRole.where(role:role,description:description).first_or_create!
于 2013-06-25T08:08:19.860 回答