ruby-on-rails - 在 Rails 3 中使用作用域

Question

我试图在我的帐户模型中定义范围，但它不起作用。这是我的代码:

class Account < ActiveRecord::Base

    has_many :organizations

    scope :primary, joins(:organizations).where('organizations.primary = ?', true)

    accepts_nested_attributes_for :organizations
end

class Organization < ActiveRecord::Base

    belongs_to :account

    has_many :locations

    accepts_nested_attributes_for :locations
end

从控制台，我尝试了以下命令:

Account.primary.first

但我收到以下错误:

ActiveRecord::StatementInvalid: SQLLite3::SQLException: near "primary":
syntax error: SELECT "accounts".* FROM "accounts" INNER JOIN "organizations" ON
"organizations"."account_id" = "accounts"."id" WHERE (organizations.primary = 't')
LIMIT 1

我认为名称“primary”可能会导致问题。当我将范围重命名为“重要”并尝试时，我得到:

NoMethodError: undefined method 'important' for #<Class:0x1f4a900>

如果有人可以提供帮助，我将非常感激。

Answer 1

我认为你的问题是你有一个名为“primary”的列，它是 reserved word 。尝试引用它:

scope :primary, joins(:organizations).where('organizations."primary" = ?', true)

此异常:

SQLLite3::SQLException: near "primary":

来自 SQLite，而不是来自 ActiveRecord 或 Rails。