Question

我有一个应用程序，应该使用数据库中的where进行查询。一切看起来都很好。这是我的模型：

class TalentType < ApplicationRecord
    def talent_abilities
        TalentAbility.where(talent_type: self)
    end
end

在我的控制台中，当我执行查询时，它会正确返回数据，但查询的最后一行是ActiveRecord :: Relation。问题是，在我看来，我会执行以下操作：

<h6 class="subheading">Abilities</h6>
  <%= current_user.talent.talent_type.talent_abilities.each do |ta| %>
    <div class="form-group no-border bottom-0">
       <%= ta.name %>
     </div>
  <% end %>

我的最后一行是：

<ActiveRecord::Relation [#<TalentAbility id: 1, name: "Scuba diving", requires_description: false, talent_type_id: 1, created_at: "2018-11-21 15:10:02", updated_at: "2018-11-21 15:10:02">, #<TalentAbility id: 2, name: "River rafting", requires_description: false, talent_type_id: 1, created_at: "2018-11-21 15:10:02", updated_at: "2018-11-21 15:10:02">,

因此，在控制台中，我完美地返回了所有TalentAbility，但是最后一个元素随ActiveRecord一起出现。像这样：

[#<TalentAbility:0x00000005cdab68
  id: 1,
  name: "Scuba diving",
  requires_description: false,
  talent_type_id: 1,
  created_at: Wed, 21 Nov 2018 15:10:02 UTC +00:00,
  updated_at: Wed, 21 Nov 2018 15:10:02 UTC +00:00>,

.........

#<TalentAbility:0x00000005cd03e8
  id: 52,
  name: "Play Musical Instrument",
  requires_description: false,
  talent_type_id: 1,
  created_at: Wed, 21 Nov 2018 15:10:02 UTC +00:00,
  updated_at: Wed, 21 Nov 2018 15:10:02 UTC +00:00>]
 => #<ActiveRecord::Relation [#<TalentAbility id: 1, name: "Scuba diving", requires_description: false, talent_type_id: 1, created_at: "2018-11-21 15:10:02", updated_at: "2018-11-21 15:10:02">, #<TalentAbility id: 2, name: "River rafting", requires_description: false, talent_type_id: 1, created_at: "2018-11-21 15:10:02", updated_at: "2018-11-21 15:10:02">, #<TalentAbility id: 3, name: "Bungee jumping", requires_description: false, talent_type_id: 1, created_at: "2018-11-21 15:10:02", updated_at: "2018-11-21 15:10:02">, #<TalentAbility id: 4, name: "Extreme Sports", requires_description: false, talent_type_id: 1, created_at: "2018-11-21 15:10:02", updated_at: "2018-11-21 15:10:02">, #<TalentAbility id: 5, name: "Basketball", requires_description: false, talent_type_id: 1, created_at: "2018-11-21 15:10:02", updated_at: "2018-11-21 15:10:02">, #<TalentAbility id: 6, name: "Skiing", requires_description: false, talent_type_id: 1, created_at: "2018-11-21 15:10:02", updated_at: "2018-11-21 15:10:02">, #<TalentAbility id: 7, name: "Hiking", requires_description: false, talent_type_id: 1, created_at: "2018-11-21 15:10:02", updated_at: "2018-11-21 15:10:02">, #<TalentAbility id: 8, name: "Ice skating", requires_description: false, talent_type_id: 1, created_at: "2018-11-21 15:10:02", updated_at: "2018-11-21 15:10:02">, #<TalentAbility id: 9, name: "Surfing", requires_description: false, talent_type_id: 1, created_at: "2018-11-21 15:10:02", updated_at: "2018-11-21 15:10:02">, #<TalentAbility id: 10, name: "Racing", requires_description: false, talent_type_id: 1, created_at: "2018-11-21 15:10:02", updated_at: "2018-11-21 15:10:02">, ...]>

如何避免查询的最后一行？

Answer 1

只需从迭代结果的行中删除=：

<% current_user.talent.talent_type.talent_abilities.each do |ta| %>
  <div class="form-group no-border bottom-0">
    <%= ta.name %>
  </div>
<% end %>

如何在Ruby on Rails中正确地执行“ where”子句？

1 个答案: