ruby-on-rails - Rails 4 中 has_many 关系的多个条件

Question

我正在更新旧的 Rails 2.0 应用程序，发现这段代码似乎不再适用于 Rails 4...:

公司.rb:

has_many :orders
has_many :pending_orders,
    :class_name => "Order",
    :conditions => "(orders.coworker_id IS NULL OR orders.delivery_time IS NULL) AND orders.finished_at IS NULL",
    :order => "orders.created_at ASC"

在这种情况下，文档不是很全面，所以我正在寻找正确的解决方案来将此代码更新为 Rails 4 语法。这是我的尝试，但我不确定这是否是正确的解决方案:

has_many :pending_orders, -> { (where(orders: {coworker_id: nil}) || where(orders: {delivery_time: nil})) && where(orders: {finished_at: nil}) }, class_name: "Order"

Answer 1

如果您的尝试不起作用，请尝试像这样给予

has_many :pending_orders, -> { where(orders.coworker_id IS NULL OR orders.delivery_time IS NULL) And orders.finished_at IS NULL }, class_name: "Order"

Source