Ruby on rails 作用域查询中的ActiveRecord或子句

根据上面的代码，是否可以在

：conditions

中添加OR子句来表示

statuses = %w(sick healthy hungry)

query = User.scoped(:joins => 'left outer join pets on pets.user_id = users.id', :conditions => { 'pets.id' => nil, 'users.job_status' => stati })

---

您可以使用gem执行以下操作

|

符号用于

或

条件

---

PS：指令

include

使用

左外联接

，因此无需手动编码联接。

您可以使用SQL条件而不是哈希条件：

statuses = %w(sick healthy hungry)

query = User.include(:pets).where(
  ('pets.id' => nil, 'users.job_status' => statuses) |
  ('users.gender' => 'male')
)

或：

缺点是您必须避免手动尝试

pets.is=NULL

statuses = %w(sick healthy hungry)

query = User.include(:pets).where(
  ('pets.id' => nil, 'users.job_status' => statuses) |
  ('users.gender' => 'male')
)

query = User.scoped(
    :joins => 'left outer join pets on pets.user_id = users.id',
    :conditions => [
        '(pets.id is null AND users.status IN (?)) OR (users.gender = ?)',
        statuses, 'male'
    ]
)

query = User.scoped(
    :joins => 'left outer join pets on pets.user_id = users.id',
    :conditions => [
        '(pets.id is null AND users.status IN (:statuses)) OR (users.gender = :gender)',
        { :status => statuses, :gender => 'male' }
    ]
)