Question

我有以下型号：

#models/location.rb
class Location < ActiveRecord::Base
    scope :partner_locations, ->{where(partner: true)}
    scope :education_locations, ->{where(education: true)}
end

然后我有以下代码：

locations = Location.none
if true
  #append onto that locations activerecord::relation object those locations that are partner locations
  locations << Location.partner_locations
end
if true
  #append onto that locations activerecord::relation object those locations that are education locations
  locations << Location.education_locations
end
return locations

我认为这段代码会返回一个activerecord :: relation对象，里面有一些对象。相反，它只返回：[]，只是一个空的Location :: ActiveRecord_Relation对象。

如何将记录追加到此Location :: ActiveRecord_Relation对象？

我做了一些研究，我看到有些人建议使用merge，但我认为这不是我想要的。我没有做任何过滤。我只想在Location :: ActiveRecord_Relation对象中附加Location个对象，以便我可以使用其他方法，如：locations.order(:name)。

Answer 1

如果有人有更好的方法，我很想知道。

我通过附加到常规数组来做我想要做的事情，然后在返回之前，我将其转换为activerecord :: relation，以便我可以在其上使用activerecord方法。如果我可以使用相同的activerecord :: object来完成整个事情，那就太好了。

locations = []
if true
  #append onto that locations array all the location objects that are partner locations
  locations = locations + Location.partner_locations
end
if true
  #append onto that locations array all those location objects those locations that are education locations
  locations = locations + Location.education_locations
end
return Location.where(id: locations.map(&:id)).order(:name)

Answer 2

尝试以下方法：

@locations = Location.order(:name)
@locations = @locations.partner_locations if # what ever logic 
@locations = @locations. education_locations if # what ever logic 
@locations

ActiveRecord Relation：在ActiveRecord :: Relation Object中追加对象

2 个答案: