Rails ActiveRecord 嵌套。創建！ 使用 PSQL POINT 類型

Question

我正在嘗試使用 Rails 和 ActiveRecord 創建一個深度嵌套的 object。

Order.create!(params)

model 包含一個子Address ，該地址具有 PSQL 類型 POINT 的coordinates字段。

因此，當我嘗試創建它時，出現以下錯誤。 我猜它試圖通過使用提供的字段首先加載Address類型，但因為沒有=比較而掛斷在coordinates (POINT) 類型上（根據https://www.postgresql ，它是作為~=完成的。 org/docs/13/functions-geometry.html ）。

所以我的問題......有沒有辦法向 ActiveRecord 提供提示以幫助它正確執行此查詢，或者我應該如何解決這個問題？

 Address Load (0.7ms)  SELECT "addresses".* FROM "addresses" WHERE "addresses"."firstname" = '-' AND "addresses"."lastname" = '-' AND "addresses"."phone" = '-' AND "addresses"."coordinates" = '-74.0064172,40.7049028' AND "addresses"."address1" = '110 Wall St' AND "addresses"."address2" = '' AND "addresses"."city" = 'New York' AND "addresses"."zipcode" = '10005' AND "addresses"."state_id" = 1 AND "addresses"."country_id" = 1 LIMIT 1
  ↳ app/services/cart/create_cart_service_decorator.rb:21:in `call'
PG::UndefinedFunction: ERROR:  operator does not exist: point = unknown
LINE 1: ..."phone" = '-' AND "addresses"."coordinates" = '-74.006...
                                                             ^
HINT:  No operator matches the given name and argument types. You might need to add explicit type casts.

這是一個獨立的文件來重現這一點。

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  # Activate the gem you are reporting the issue against.
  gem "activerecord", "6.1.3.2"
  gem "pg"
end

require "active_record"
require "minitest/autorun"
require "logger"

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: "postgresql", database: "test-db")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :addresses, force: true do |t|
    t.point :coordinates
  end
end

class Address < ActiveRecord::Base
end

class BugTest < Minitest::Test
  def test_nested_saving
    address = Address.find_or_create_by!({ coordinates: ActiveRecord::Point.new(0, 0) })

    assert address
  end
end

Answer 1

您需要將參數顯式類型轉換為 ActiveRecord::Point 實例，從某些版本開始就支持該實例：

x, y = params[:coordinates].split(',').map(&:to_f)
params[:coordinates] = ActiveRecord::Point.new(x, y)