Question

我有以下架构：

Text scoreText = new Text(scoreString);

scoreText.setFont(new Font("ARIAL", 30);
scoreText.setStyle("-fx-font-weight: bold;");
scoreText.setFill(Color.WHITE);

Pane scorePane = new Pane(scoreText);

scoreText.relocate(100, 100);

root.getChildren().add(scoreText);

我希望使用AciveRecord获取所有公开或私有的群组，而不是名为“MyAds”的特定广告组的一部分。我已经设法使用以下查询获取列表，但它看起来很难看，我确信有更好的方法来做到这一点。有人可以帮忙吗？

create_table "ad_groups", force: :cascade do |t|
  t.string   "name"
  t.datetime "created_at", null: false
  t.datetime "updated_at", null: false
end
create_table "ad_placements", force: :cascade do |t|
  t.integer  "advertisement_id"
  t.integer  "ad_group_id"
  t.datetime "created_at",       null: false
  t.datetime "updated_at",       null: false
  t.index ["ad_group_id"], name: "index_ad_placements_on_ad_group_id", using: :btree
  t.index ["advertisement_id"], name: "index_ad_placements_on_advertisement_id", using: :btree
end
create_table "advertisements", force: :cascade do |t|
  t.string   "name"
  t.string   "image"
  t.string   "link"
  t.datetime "created_at",  null: false
  t.datetime "updated_at",  null: false
  t.date     "expiry_date"
  t.integer  "company_id"
  t.index ["company_id"], name: "index_advertisements_on_company_id", using: :btree
end
create_table "companies", force: :cascade do |t|
  t.string   "name"
  t.datetime "created_at",      null: false
  t.datetime "updated_at",      null: false

end
create_table "groups", force: :cascade do |t|
  t.string   "name"
  t.integer  "company_id"
  t.string   "group_type"
  t.datetime "created_at"
  t.datetime "updated_at"
  t.index ["company_id"], name: "index_groups_on_company_id", using: :btree
end

Answer 1

OR条件可以合并为一个IN条件，如果您通过公共＆＃39;和'私人＆＃39;在数组中。您可能需要查看merge以让Rails管理连接条件。这是一个可能的选择：

my_ad_groups = Group.joins(company: { advertisements: { ad_placements: :ad_group } }).merge(AdGroup.where(name: 'MyAds'))
Group.where(group_type: ['Public', 'Private']).where.not(id: my_ad_groups)

如何使用NOT IN并加入AciveRecord / Rails 5？

1 个答案: